Re: [Emc-users] Need longer belt
On 3/11/2014 11:26 AM, Gene Heskett wrote: On Tuesday 11 March 2014 13:25:43 John Kasunich did opine: http://imgs.xkcd.com/comics/standards.png Chuckle. But how old is that? we must have at least 20 by now. A perfect example is the USB standard. It began with exactly two and only two types of connector, A for hosts and B for devices. Then came Mini B and for some reason early digital cameras all had to have various odd USB connectors, often including A/V out. In 2007 Micro B was introduced and it took stores nearly two years to realize it existed and stock cables with that connector. There's also a few versions of powered USB which are double stacked connectors having one part of the ports and plugs just for extra power. Now there's USB 3.0. The designers of it had an uncommon fit of sanity and made both ends of the standard backwards sympatico with ye olde full size original Type A USB for the host and Micro B for the device. The USB 3.0 device end looks funkyweird but just plug a 2.0 cord into one end of the 3.0 socket. But wait! USB 3.0 gets even more sanity! A USB 3.0 host plug will fit into a USB 1.1/2.0 Type A port and the device will operate at the lower speed. -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Wednesday 12 March 2014 03:13:46 Gregg Eshelman did opine: On 3/11/2014 11:26 AM, Gene Heskett wrote: On Tuesday 11 March 2014 13:25:43 John Kasunich did opine: http://imgs.xkcd.com/comics/standards.png Chuckle. But how old is that? we must have at least 20 by now. A perfect example is the USB standard. It began with exactly two and only two types of connector, A for hosts and B for devices. Then came Mini B and for some reason early digital cameras all had to have various odd USB connectors, often including A/V out. In 2007 Micro B was introduced and it took stores nearly two years to realize it existed and stock cables with that connector. There's also a few versions of powered USB which are double stacked connectors having one part of the ports and plugs just for extra power. Now there's USB 3.0. The designers of it had an uncommon fit of sanity and made both ends of the standard backwards sympatico with ye olde full size original Type A USB for the host and Micro B for the device. The USB 3.0 device end looks funkyweird but just plug a 2.0 cord into one end of the 3.0 socket. But wait! USB 3.0 gets even more sanity! A USB 3.0 host plug will fit into a USB 1.1/2.0 Type A port and the device will operate at the lower speed. I found grabbed one of the earlier USB standard papers several years ago, and every time I read it, I heard echo's of Blair Mountains Tommy Guns from the coal wars 100 years ago. Turf wars were quite visible in that paper. Firewire 400 at the time worked a heck of a lot better, but then apple had to have a very high royalty fee. FW still works better, but you see where it is in the new designs now even at firewire 800. You can't buy anything today with a FW port on it. I hope those holes in apples feet aren't too painful, but never would I ask for them to be painless either. Like John Wayne said, stupidity should hurt. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Mon, 10 Mar 2014 18:21:56 -0400, you wrote: On Monday 10 March 2014 18:19:45 jeremy youngs did opine: gene , have a go at this http://precisionparts.wmberg.com/timingBeltsChains I am thinking I need a 5mm pitch, 9.5mm wide, 72 cogs long, but they only go up to 3mm pitch. If it's a Sieg C2 or clone the correct belt is a 5mm pitch 9mm wide 70 tooth Steve Blackmore -- -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 06:06:32 Steve Blackmore did opine: On Mon, 10 Mar 2014 18:21:56 -0400, you wrote: On Monday 10 March 2014 18:19:45 jeremy youngs did opine: gene , have a go at this http://precisionparts.wmberg.com/timingBeltsChains I am thinking I need a 5mm pitch, 9.5mm wide, 72 cogs long, but they only go up to 3mm pitch. If it's a Sieg C2 or clone the correct belt is a 5mm pitch 9mm wide 70 tooth Does that translate to a 7x12 a good decade old? One fly in this soup. Where the motor WAS, is now a jackshaft, mounted in a frame of 1/2 thick high silicon alu, drill tapped to mount exactly where the motor WAS. That means the mount is quite grossly adjustable up and down as the holding studs can rise or fall in a pair of slots in the front face of the lathes bed casting, with the 1HP treadmill motor hanging off the back of the jackshaft frame. These studs draw the base of the frame up against a pair of adjustable set screws, so that the motor, by way of the slots, can be jacked up and down OR leveled so the belt runs true. The setscrews then provide a pivot point, allowing the motor to be aligned so the belt tracking doesn't want to run against one flange in forward rotation, but crawl to the other flange in reverse. But with the new parts, this properly aligned position has jumped vertically by about 2 cogs of the belt, raising the outboard motor a good 1/4 IOW. So I now need a 72 cog belt, one what actually fits the upper pulley correctly since this belt seems to be about 2 or 3 thou longer per cog on the pulley and throwing a just barely detectable slack loop at the back of the belt wrap. This will put so much wear and friction heating on the thrust faces of the cogs and the belt that I can't see it running for a long time at all. And for some reason I have yet to fathom, replacing both pulleys and the belt with these OEM parts, all of which have been working well since I put that assembly in early last summer, have now cause the center to center distance to be reduced to where I now need a 72 tooth belt to once again lower the motor by about that much as the flywheel on the motor now projects about 80 thou into the top cover that tries to keep the swarf out of the electronics since all the motors drive electronics except the dynamic braking are also in this box. The braking relays are in another smaller box bolted to the lid of this box. The whole pair of boxes is made out of alu angle for the corners, and slabs of 1/8 alu sheet from a wrecked UPS van box side. Handy stuff to collect when you stumble over it. :) Where last summer it sat low enough that the mounting stud nuts were nicely accessible to a 10mm socket, below the line of the 16mm Z drive ball screw, now its all so high I have to sneak a 10mm end wrench in behind the Z screw and turn the nuts about 1/12th turn per stroke of the wrench. Something in these supposedly identical new parts just doesn't fit right. I can tilt it down so the motor clears, but then the jackshaft is quite noticeably tilted off the Z axis line of the whole lathe bed, running uphill to get to the lower pulley with lots of tension on the belt and its riding the flange, HARD. Frustration with the whole mary ann is running high enough that I'm looking at the 11x28 from Bolton Hdwe. But it comes with such a puny powered spindle and zip accessories that the true price will be about 3Gs more than they want by the time its truly useful. TBT, it cannot, with that spindle power, cut material in excess of 1 OD in comfort. That is about my situation now, regardless of motor power, its out of cast iron at about 1 OD. And with the lathe down, the putting ball screws in the mill project is also dead in the water because I can't make the nut holders. Then the MRI they took on my lower back Friday is so bad they may as well just take me out and shoot me. Don't get old guys, its not for wimps but the back pain is turning me into one anyway. Sigh. Its this stuff that keeps me out of the bars! Steve Blackmore -- -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the
Re: [Emc-users] Need longer belt
On Mon, Mar 10, 2014, at 11:09 PM, Gene Heskett wrote: Damn John, I just counted it twice more and got 31 both times. At a top of the tooth diameter of 1.803, where the heck does that leave us/me? The smaller driver pulley, is .976 across the top of the teeth, and 17 teeth, .388 between the flanges. So a .375 wide belt will fit, as will a 9.5mm wide belt. But a 10mm will be pinched until it burns up the flange anyway. OK, we have two data points: 17 teeth and 0.976 OD, and 31 teeth with an OD of 1.803. We also have two unknowns, the belt pitch and the distance from the OD to the pitch line. That should be solvable. Wait a bit while I try to do math. OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) I did some googling for 3/16 pitch belts. I stumbled across a few similar tales of woe on various forums. Eastern lathes with belts of approximately 3/16 pitch, and nobody able to find spares. http://www.cnczone.com/forums/general-metal-working-machines/112495-timing-belt-available-lathe.html http://madmodder.net/index.php/topic,5006.msg56077.html?PHPSESSID=tef5o88m42hje4vlt64jolptb2#msg56077 One person said: I believe that Roman is correct on the 3/16 pitch. This is an old design from the 50's or 60's and was know as an F profile. There were never any standard sizes and molds were just purchased for a specific OE project. The bad news is that very few F profile belts are still available and would not be something that an industrial distributor would be able to get for you. Why a fairly modern Chinese lathe would be using a 50 year old inch belt type is another mystery, although someone in one of those threads speculated that the Chinese factory either had a big stock of belts, or had the mandrel that is used to make the belts. At this point I'm pretty sure it is NOT any modern standard belt profile. How hard would it be to replace the pulleys? XL profile is probably the most readily available and cheapest. -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
In our first attempt to make the spindle encoder for the KT - we grabbed a timing gear that we had 2 of.. (Something from some old printers we took apart (70's vintage probably). Well - when we got all done we could not find a belt to match the pitch. We gave up and used different timing gears that we knew fit a common belt. unknown gear... http://electronicsam.com/images/KandT/conversion/testing/DSCF1231.JPG sam On Tue, 11 Mar 2014 09:27:30 -0400 John Kasunich jmkasun...@fastmail.fm wrote: On Mon, Mar 10, 2014, at 11:09 PM, Gene Heskett wrote: Damn John, I just counted it twice more and got 31 both times. At a top of the tooth diameter of 1.803, where the heck does that leave us/me? The smaller driver pulley, is .976 across the top of the teeth, and 17 teeth, .388 between the flanges. So a .375 wide belt will fit, as will a 9.5mm wide belt. But a 10mm will be pinched until it burns up the flange anyway. OK, we have two data points: 17 teeth and 0.976 OD, and 31 teeth with an OD of 1.803. We also have two unknowns, the belt pitch and the distance from the OD to the pitch line. That should be solvable. Wait a bit while I try to do math. OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) I did some googling for 3/16 pitch belts. I stumbled across a few similar tales of woe on various forums. Eastern lathes with belts of approximately 3/16 pitch, and nobody able to find spares. http://www.cnczone.com/forums/general-metal-working-machines/112495-timing-belt-available-lathe.html http://madmodder.net/index.php/topic,5006.msg56077.html?PHPSESSID=tef5o88m42hje4vlt64jolptb2#msg56077 One person said: I believe that Roman is correct on the 3/16 pitch. This is an old design from the 50's or 60's and was know as an F profile. There were never any standard sizes and molds were just purchased for a specific OE project. The bad news is that very few F profile belts are still available and would not be something that an industrial distributor would be able to get for you. Why a fairly modern Chinese lathe would be using a 50 year old inch belt type is another mystery, although someone in one of those threads speculated that the Chinese factory either had a big stock of belts, or had the mandrel that is used to make the belts. At this point I'm pretty sure it is NOT any modern standard belt profile. How hard would it be to replace the pulleys? XL profile is probably the most readily available and cheapest. -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
http://imgs.xkcd.com/comics/standards.png -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 03/11/2014 08:27 AM, John Kasunich wrote: OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) Well, 5 mm is ~ .197, so maybe accounting for the pitch diameter to be larger than the pulley OD, that could match up. these numbers are only about 6% different. So, it certainly could be a perfect 5 mm PD at the actual diameter where it is supposed to be measured. With that in hand, Gene could probably use one of those on-line belt length calculator programs to figure the correct belt length for the distance between shafts. Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 03/11/2014 08:48 AM, sa...@empirescreen.com wrote: In our first attempt to make the spindle encoder for the KT - we grabbed a timing gear that we had 2 of.. (Something from some old printers we took apart (70's vintage probably). Well - when we got all done we could not find a belt to match the pitch. We gave up and used different timing gears that we knew fit a common belt. Yup, that's how I found out about 2mm pitch belts! I added a spindle encoder to a minimill shortly before going to one of the NAMES shows. (See last pic at http://pico-systems.com/minimill.html ) I used some junk pulleys off a printer tractor feed mechanism, I think. I ordered MXL belts for it, put it all together and then saw lumps running around the pulleys. After watching for a while, I realized it was a pitch mismatch and about every rev it would build up and the belt would jump a tooth. With time rapidly running out before the show, I ordered 2mm belts, hoping that would be the correct size. (I was able to determine the required pitch was SMALLER than the MXL belt, so I had a pretty good idea the only other thing it could be was 2mm.) The right belts showed up just days before I had to leave for NAMES, but I was able to get a very early version of lathe threading working for display there. Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 12:29:32 John Kasunich did opine: On Mon, Mar 10, 2014, at 11:09 PM, Gene Heskett wrote: Damn John, I just counted it twice more and got 31 both times. At a top of the tooth diameter of 1.803, where the heck does that leave us/me? The smaller driver pulley, is .976 across the top of the teeth, and 17 teeth, .388 between the flanges. So a .375 wide belt will fit, as will a 9.5mm wide belt. But a 10mm will be pinched until it burns up the flange anyway. OK, we have two data points: 17 teeth and 0.976 OD, and 31 teeth with an OD of 1.803. We also have two unknowns, the belt pitch and the distance from the OD to the pitch line. That should be solvable. Wait a bit while I try to do math. OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) I think you have nailed it. I did some googling for 3/16 pitch belts. I stumbled across a few similar tales of woe on various forums. Eastern lathes with belts of approximately 3/16 pitch, and nobody able to find spares. http://www.cnczone.com/forums/general-metal-working-machines/112495-timi ng-belt-available-lathe.html http://madmodder.net/index.php/topic,5006.msg56077.html?PHPSESSID=tef5o 88m42hje4vlt64jolptb2#msg56077 One person said: I believe that Roman is correct on the 3/16 pitch. This is an old design from the 50's or 60's and was know as an F profile. There were never any standard sizes and molds were just purchased for a specific OE project. The bad news is that very few F profile belts are still available and would not be something that an industrial distributor would be able to get for you. Why a fairly modern Chinese lathe would be using a 50 year old inch belt type is another mystery, although someone in one of those threads speculated that the Chinese factory either had a big stock of belts, or had the mandrel that is used to make the belts. Again, it makes sense, this design had been in the sale papers of the cheap tool peddlers like HF for at least 10 years when I bought this one back in the late 90's off a Speedway truck at the local VFD. At this point I'm pretty sure it is NOT any modern standard belt profile. How hard would it be to replace the pulleys? XL profile is probably the most readily available and cheapest. From SPI-SC, about $175 a set in metal what I assume is kevlar belt backing. In XL format. The bores are a hair odd, and it would be the first time they ever broached a 4mm key in a 10mm bore for the top pulley. STD is a 3mm for that bore. And there is not room to make the top one more than 30 thou bigger without dremel work on the bolt bosses that hold that die cast cover in place on the back of the spindle/gear housing. So it can be done, just bring money. OEM stuff can be had for about 10% of that, for a full set, 2 pulleys and the belt. The weather is decent, already 60F change, so I'll mess with it some more today, and maybe even refit the motor mount. But the tooth miss-match tells me wear will be high under any conditions of enough tension to keep it from walking. Thanks John. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 13:25:43 John Kasunich did opine: http://imgs.xkcd.com/comics/standards.png Chuckle. But how old is that? we must have at least 20 by now. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 13:28:53 Jon Elson did opine: On 03/11/2014 08:27 AM, John Kasunich wrote: OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) Well, 5 mm is ~ .197, so maybe accounting for the pitch diameter to be larger than the pulley OD, that could match up. these numbers are only about 6% different. So, it certainly could be a perfect 5 mm PD at the actual diameter where it is supposed to be measured. With that in hand, Gene could probably use one of those on-line belt length calculator programs to figure the correct belt length for the distance between shafts. Jon Even simpler Jon, just add 2 cogs to the belt everything falls right back at the proper place. It would take me about half an hour, piling bits and pieces back up on top of the adjacent tool cabinet to get where I could put a caliper on the C-C, which is very close to the maximum a 6 caliper can reach. The weather is good, so I'll mess with it some more today. But I am with John K., I think these pulleys are 3/16, not XL, and the new belts may in fact be XL's. There is a definite miss-fit, allowing about a 30 thou belly on the back of the pulley at the midpoint of the belt wrap. Belt cog and pulley wear (and heating under load) will be a wear factor that can't be ignored. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 11 March 2014 17:17, Gene Heskett ghesk...@wdtv.com wrote: From SPI-SC, about $175 a set in metal what I assume is kevlar belt backing. In XL format. The bores are a hair odd, and it would be the first time they ever broached a 4mm key in a 10mm bore for the top pulley. No need to broach it. Who cares if your keyway has a round top? Just mill it. You can always file a radius on the top of the key if you want to. I took an entirely diffferent approach on my 9x40: https://picasaweb.google.com/lh/photo/Ilc3m7J-FIGIoLXQTOYqcdMTjNZETYmyPJy0liipFm0?feat=directlink -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 13:45:31 andy pugh did opine: On 11 March 2014 17:17, Gene Heskett ghesk...@wdtv.com wrote: From SPI-SC, about $175 a set in metal what I assume is kevlar belt backing. In XL format. The bores are a hair odd, and it would be the first time they ever broached a 4mm key in a 10mm bore for the top pulley. No need to broach it. Who cares if your keyway has a round top? Just mill it. You can always file a radius on the top of the key if you want to. I took an entirely diffferent approach on my 9x40: https://picasaweb.google.com/lh/photo/Ilc3m7J-FIGIoLXQTOYqcdMTjNZETYmyPJ y0liipFm0?feat=directlink That didn't seem to be the right pix Andy. ? Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tue, Mar 11, 2014, at 12:41 PM, Jon Elson wrote: On 03/11/2014 08:27 AM, John Kasunich wrote: OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) Well, 5 mm is ~ .197, so maybe accounting for the pitch diameter to be larger than the pulley OD, that could match up. these numbers are only about 6% different. So, it certainly could be a perfect 5 mm PD at the actual diameter where it is supposed to be measured. Nope. The math I did took that into account. The distance from pulley OD up to pitch diameter is a characteristic of the belt, so it is the same for both pulleys. The unknowns are pitch and difference between OD and PD. The knowns are tooth count and OD for two different size pulleys. The result is two equations with two unknowns, and is solvable. The pitch would have to be within a couple thou of 0.1855. No way could it be 5mm. -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 14:05:05 John Kasunich did opine: On Tue, Mar 11, 2014, at 12:41 PM, Jon Elson wrote: On 03/11/2014 08:27 AM, John Kasunich wrote: OK, math done. The pitch comes out to 0.1855, which has me mystified, because I've never heard of such a thing. (I've done a fair bit if tooth- belt research for different projects.) Well, 5 mm is ~ .197, so maybe accounting for the pitch diameter to be larger than the pulley OD, that could match up. these numbers are only about 6% different. So, it certainly could be a perfect 5 mm PD at the actual diameter where it is supposed to be measured. Nope. The math I did took that into account. The distance from pulley OD up to pitch diameter is a characteristic of the belt, so it is the same for both pulleys. The unknowns are pitch and difference between OD and PD. The knowns are tooth count and OD for two different size pulleys. The result is two equations with two unknowns, and is solvable. The pitch would have to be within a couple thou of 0.1855. No way could it be 5mm. So in the long view, I may as well give sdp-sc a call confirm the ugly details give them a card number. Whatever I'll manage to make work today is a short term solution only. Thank you John. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 11 March 2014 17:46, Gene Heskett ghesk...@wdtv.com wrote: I took an entirely diffferent approach on my 9x40: https://picasaweb.google.com/lh/photo/Ilc3m7J-FIGIoLXQTOYqcdMTjNZETYmyPJy0liipFm0?feat=directlink That didn't seem to be the right pix Andy. ? It's the right picture. I dispensed with the entire OE drivetrain. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 11 March 2014 18:07, Gene Heskett ghesk...@wdtv.com wrote: So in the long view, I may as well give sdp-sc a call confirm the ugly details give them a card number. Why not buy pilot-bore pulleys and modify to suit? It would be easier with a working lathe, though not _that_ much easier as the pulleys with flanges are quite hard to hold. Clamp down the pulley to the milling table, pick up the centre with a coaxial indicator, bore to size with a boring head, mill a keyway. You can buy the co-ax indicator and the boring head and still be ahead of the game. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Tuesday 11 March 2014 18:47:15 andy pugh did opine: On 11 March 2014 18:07, Gene Heskett ghesk...@wdtv.com wrote: So in the long view, I may as well give sdp-sc a call confirm the ugly details give them a card number. Why not buy pilot-bore pulleys and modify to suit? It would be easier with a working lathe, though not _that_ much easier as the pulleys with flanges are quite hard to hold. Clamp down the pulley to the milling table, pick up the centre with a coaxial indicator, bore to size with a boring head, mill a keyway. You can buy the co-ax indicator and the boring head and still be ahead of the game. Thats a good possibility too, as the mill is working. They also has a bastard buttress thread based taperlock work alike that I might be able to use. Properly snugged up to 1/8 turn from broke, I would not need any keyways either. I'll dig into that case later tonight too. IIRC I looked but no 9mm hubs in that style so I backed out. But they also need more free shaft length that I have too from the pix. The 10mm hub for the upper one has about 11.5mm of available shaft, but that hub needs 15 or more IIRC. The lower, flanged pulleys problem is its a 9mm shaft. To use one of those assemblies I'd first have to make a 1/2mm thick spacer tube. Or, I have more tool steel shafting, and that shaft nose could grow to 12mm without an huge amount of trouble once I make this work temporarily. I did get it to track decent today, but its still too high, so I'll put a foam weather strip in to hold it up for clearance, need about 1/8. Redrilling the screw holes isn't a problem. But I didn't get quite that far before I ran out of me today as I was thinking and running a hand backhoe too, trying to fill in the gas line ditch in the back yard that leads to the standby generator. Should have done more of it yesterday when this stuff we mistakenly call dirt was a bit softer. By tomorrow it will be as hard as granite. Yellow clay, grows weeds nut rock real well but nothing edible. :( Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Sun, Mar 9, 2014 at 11:20 PM, Gene Heskett ghesk...@wdtv.com wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. I find that by the time I get the motor leveled and the belt running true, the far end of the motor with the flywheel is going to be dragging on the cover I made by about 1/16 where before it had 1/8 of clearance. That OEM belt is a lighter duty belt, black neoprene I think, and the edges can wear ragged fairly rapidly if touching the flange of the motor pulley. The new one is already worn ragged just from hand exercise while the old ones edges are pristine after many hours of service. I believe thats a 72 cog belt. Who is the best and most economical supplier for the white kevlar backed version of these small timing belts of nominally 9mm widths? From the clearance and alignment problems, I think a 74 or 75 tooth would be much better. The non-flanged pulley gear measures about 10.2mm width, but the flange separation is about 9.8mm. And a 9mm belt seems to fit quite well. Thanks all. Cheers, Gene Gene, Dunno if they're the cheapest, but I've never had a problem with them: http://www.sdp-si.com/ Mark -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 05:53:17 Mark Wendt did opine: On Sun, Mar 9, 2014 at 11:20 PM, Gene Heskett ghesk...@wdtv.com wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. I find that by the time I get the motor leveled and the belt running true, the far end of the motor with the flywheel is going to be dragging on the cover I made by about 1/16 where before it had 1/8 of clearance. That OEM belt is a lighter duty belt, black neoprene I think, and the edges can wear ragged fairly rapidly if touching the flange of the motor pulley. The new one is already worn ragged just from hand exercise while the old ones edges are pristine after many hours of service. I believe thats a 72 cog belt. Who is the best and most economical supplier for the white kevlar backed version of these small timing belts of nominally 9mm widths? From the clearance and alignment problems, I think a 74 or 75 tooth would be much better. The non-flanged pulley gear measures about 10.2mm width, but the flange separation is about 9.8mm. And a 9mm belt seems to fit quite well. Thanks all. Cheers, Gene Gene, Dunno if they're the cheapest, but I've never had a problem with them: http://www.sdp-si.com/ I see that in XL they have a 9.5mm width which would fit, but if you hunt around, the GT2 2mm pitch stuff doesn't match at all. They don't link the sizes separate, so the metric stuff is like 68 down clicks to look at all of them. I'll get the 2nd new one I got from LMS see if there are any ID marks on it. Then look around tomorrow. Thanks Mark. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 10 March 2014 09:59, Gene Heskett ghesk...@wdtv.com wrote: I see that in XL they have a 9.5mm width which would fit, but if you hunt around, the GT2 2mm pitch stuff doesn't match at all. You might find http://www.hpcgears.com/n/products/1.pulleys_belts/pulleys_belts.php useful. I don't think you would want to buy from them, but the catalogue pages for each belt type have a profile drawing and measurements. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 11:31:19 andy pugh did opine: On 10 March 2014 09:59, Gene Heskett ghesk...@wdtv.com wrote: I see that in XL they have a 9.5mm width which would fit, but if you hunt around, the GT2 2mm pitch stuff doesn't match at all. You might find http://www.hpcgears.com/n/products/1.pulleys_belts/pulleys_belts.php useful. I don't think you would want to buy from them, but the catalogue pages for each belt type have a profile drawing and measurements. Thanks Andy. I grabbed and printed the pages on belts to put n the shelf, but its a Readers Digest sized image in the middle of a letter sized sheet despite being told to fit to page. It will be useful (with a strong glass) however, thanks for the link. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 16:35:32 Gene Heskett did opine: On Monday 10 March 2014 11:31:19 andy pugh did opine: On 10 March 2014 09:59, Gene Heskett ghesk...@wdtv.com wrote: I see that in XL they have a 9.5mm width which would fit, but if you hunt around, the GT2 2mm pitch stuff doesn't match at all. You might find http://www.hpcgears.com/n/products/1.pulleys_belts/pulleys_belts.php useful. I don't think you would want to buy from them, but the catalogue pages for each belt type have a profile drawing and measurements. Thanks Andy. I grabbed and printed the pages on belts to put n the shelf, but its a Readers Digest sized image in the middle of a letter sized sheet despite being told to fit to page. It will be useful (with a strong glass) however, thanks for the link. Cheers, Gene Continuing this thread of trying to determine what belt I need to properly fit these pulleys, I have talked to Chris Wood at LMS but he can't help me with anything but OEM parts, so some math based on the gullet od + the tip od on the pulley, half of that to get the pitch diameter converted to pitch circumference, then divided by the number of cogs, 30 in this case, give me a pitch length of 4.60mm, and in cycling my digital caliper through its modes, one thing seems to stand out, 3/16. Are there belts made with a 3/16 pitch? This OEM belt that is now too short at 70 cogs, is actually different in cog heights, the old worn belt fitting the new pulleys much better than the new belts I bought, and indeed the old belt, turned wrong side out and fitted to the new one is a just noticeably longer over a 3 straight span, about half a tooths worth, than the new one. The new belts cog height is less than the old one also, by about .16mm. So at best fit, its sitting on the tops of the teeth with lots of daylight under it in the pulleys gullies. I don't recall running across a 4.644844738332509mm (calculated) or so pitch of belt anyplace in my web snooping so far. Ideas? Including me doing it wrong... Do I need to change my brand of toothpicks or what? Thanks Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Mon, Mar 10, 2014, at 04:55 PM, Gene Heskett wrote: Continuing this thread of trying to determine what belt I need to properly fit these pulleys, I have talked to Chris Wood at LMS but he can't help me with anything but OEM parts, so some math based on the gullet od + the tip od on the pulley, half of that to get the pitch diameter converted to pitch circumference, then divided by the number of cogs, 30 in this case, give me a pitch length of 4.60mm, and in cycling my digital caliper through its modes, one thing seems to stand out, 3/16. Are there belts made with a 3/16 pitch? On most timing belts, the pitch line (where you measure pitch diameter) is not half-way up the teeth as you calculated. It is actually a little outside the tops of the teeth, where the strength members of the belt are. See the drawing at http://ca-cycleworks.com/c/pics/machining/tb_meas/Timing_Belt_Pulley_Pitch_Diameter_and_Outside_Diameter.jpg -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
gene , have a go at this http://precisionparts.wmberg.com/timingBeltsChains jeremy youngs On Mon, Mar 10, 2014 at 5:17 PM, John Kasunich jmkasun...@fastmail.fmwrote: On Mon, Mar 10, 2014, at 04:55 PM, Gene Heskett wrote: Continuing this thread of trying to determine what belt I need to properly fit these pulleys, I have talked to Chris Wood at LMS but he can't help me with anything but OEM parts, so some math based on the gullet od + the tip od on the pulley, half of that to get the pitch diameter converted to pitch circumference, then divided by the number of cogs, 30 in this case, give me a pitch length of 4.60mm, and in cycling my digital caliper through its modes, one thing seems to stand out, 3/16. Are there belts made with a 3/16 pitch? On most timing belts, the pitch line (where you measure pitch diameter) is not half-way up the teeth as you calculated. It is actually a little outside the tops of the teeth, where the strength members of the belt are. See the drawing at http://ca-cycleworks.com/c/pics/machining/tb_meas/Timing_Belt_Pulley_Pitch_Diameter_and_Outside_Diameter.jpg -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
Do you have the LMS part number. I have access to pretty much any kind of belt through work. I can check tomorrow Sent from my iPad On Mar 10, 2014, at 11:35 AM, Gene Heskett ghesk...@wdtv.com wrote: On Monday 10 March 2014 11:31:19 andy pugh did opine: On 10 March 2014 09:59, Gene Heskett ghesk...@wdtv.com wrote: I see that in XL they have a 9.5mm width which would fit, but if you hunt around, the GT2 2mm pitch stuff doesn't match at all. You might find http://www.hpcgears.com/n/products/1.pulleys_belts/pulleys_belts.php useful. I don't think you would want to buy from them, but the catalogue pages for each belt type have a profile drawing and measurements. Thanks Andy. I grabbed and printed the pages on belts to put n the shelf, but its a Readers Digest sized image in the middle of a letter sized sheet despite being told to fit to page. It will be useful (with a strong glass) however, thanks for the link. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
Yes, the Pitch Dia. is greater than the OD of the sprocket. take a look at the below link. http://www.brecoflex.com/index.php?CATID=7SCATID=44 On Mon, Mar 10, 2014 at 5:17 PM, John Kasunich jmkasun...@fastmail.fmwrote: On Mon, Mar 10, 2014, at 04:55 PM, Gene Heskett wrote: Continuing this thread of trying to determine what belt I need to properly fit these pulleys, I have talked to Chris Wood at LMS but he can't help me with anything but OEM parts, so some math based on the gullet od + the tip od on the pulley, half of that to get the pitch diameter converted to pitch circumference, then divided by the number of cogs, 30 in this case, give me a pitch length of 4.60mm, and in cycling my digital caliper through its modes, one thing seems to stand out, 3/16. Are there belts made with a 3/16 pitch? On most timing belts, the pitch line (where you measure pitch diameter) is not half-way up the teeth as you calculated. It is actually a little outside the tops of the teeth, where the strength members of the belt are. See the drawing at http://ca-cycleworks.com/c/pics/machining/tb_meas/Timing_Belt_Pulley_Pitch_Diameter_and_Outside_Diameter.jpg -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 17:30:25 John Kasunich did opine: On Mon, Mar 10, 2014, at 04:55 PM, Gene Heskett wrote: Continuing this thread of trying to determine what belt I need to properly fit these pulleys, I have talked to Chris Wood at LMS but he can't help me with anything but OEM parts, so some math based on the gullet od + the tip od on the pulley, half of that to get the pitch diameter converted to pitch circumference, then divided by the number of cogs, 30 in this case, give me a pitch length of 4.60mm, and in cycling my digital caliper through its modes, one thing seems to stand out, 3/16. Are there belts made with a 3/16 pitch? On most timing belts, the pitch line (where you measure pitch diameter) is not half-way up the teeth as you calculated. It is actually a little outside the tops of the teeth, where the strength members of the belt are. See the drawing at http://ca-cycleworks.com/c/pics/machining/tb_meas/Timing_Belt_Pulley_Pit ch_Diameter_and_Outside_Diameter.jpg Oh goody. And of course its an imaginary line you can't put a caliper on. Loverly, just fscking loverly. From the looks of that drawing, one would add perhaps about half the thickness of the belt measured in the center of the cup separating the cogs. That would make the pitch line 1.3mm taller (in diameter) than the peak of the tooth. That would be about 45.84mm + 1.3mm added only once to get the solid line shown. Thats 47.15mm, fed into a circumference calculator returns 148.12609361675874 for pitch circumference, divided by the teeth, 30=4.937536453891958mm. But this miss fit belt is stamped 1.5x70. Its cogs do NOT begin to fill the gullies of the pulley. I am thinking a 5mm belt might be a closer fit. But those all appear to be a full 10mm wide, just a black one too wide for the flanges on the driving pulley. The now worn one is about 9.75mm between the flanges at the root of the gully, and only 9.85 at the top of a cog. But lets work it backwards from 30 teeth 5mm pitch. That is 150mm pitch circumference. Continuing backwards that is still within the cross sectional web of the belt so its possible. So I need a 74 cog 5mm pitch belt 9.5mm wide. Am I at least in the ballpark? I need a beer. 2 maybe. Its turning into a headache... :( Thanks John Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 18:19:45 jeremy youngs did opine: gene , have a go at this http://precisionparts.wmberg.com/timingBeltsChains I am thinking I need a 5mm pitch, 9.5mm wide, 72 cogs long, but they only go up to 3mm pitch. Thanks for looking Jeremy. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 18:22:18 Brian Morel did opine: Do you have the LMS part number. I have access to pretty much any kind of belt through work. I can check tomorrow The current LMS part number, B01-04 1105, is not the correct part, its pitch length is a small percentage longer that that of the pulley's it is supposed to run on. Throws a small amount of slack in the middle of the wrap when wrapped, and the cogs do not fill the pulley grooves by about half. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 18:33:35 Brian Morel did opine: Yes, the Pitch Dia. is greater than the OD of the sprocket. take a look at the below link. http://www.brecoflex.com/index.php?CATID=7SCATID=44 Looks good, till I tried to use the belt selector, my browser or their web page is broken as everytime I try to enter a value, it clears all other selections made except the width. So I can't select a 5mm pitch, 9,5mm wide, 72 cog belt. Thanks Brian. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
Gene: It seems like you're going about this the hard way. The first step is to identify the belt family. Look at the shape of the teeth on the belt. Are they round, or trapezoidal? Take a look at the pictures here: http://www.sdp-si.com/D265/HTML/D265T015.html Given that your pitch is approximately 5mm or 0.2 inches, likely candidates are XL (fig 19c, top row, right end), or 5mm HTD (fig 19f, 2nd row, right end), 5mm GT2 (fig 19i, 3rd row, right end), or T5 (fig 19k, bottom row center). The tooth shape should let you eliminate two of the four possibilities. It is either round (HTD or GT2) or trapezoidal (XL or T5). Any markings on the pulleys that wound indicate the type? GT2, HTD, etc? (That would make it too easy.) Assuming no markings, next step is to determine the OD of the pulleys for each type. Google found this page: http://www.pfeiferindustries.com/timing-belt-pulley-pitch-diameter-outside-diameter-charts-i-12-l-en.html Links on that page lead to PDF files with pulley dimensions for three of the belt types. It didn't have info for T5, but I found another that did. I'll save you the reading - for 30 tooth pulleys, the pitch diameters and outside diameters are: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 So, if it is trapezoidal, you can tell the difference between XL and T5 by measuring the pulley OD. 1.890 vs 1.848 should be easy to tell apart, even with manufacturing tolerances. If it is round-toothed, things are tougher. Both the PD and OD of HTD5 and GT2-5mm are the same. The tooth profiles are close enough that you could probably make do with either belt - get whichever one is easier to find. Once you know what type of belt you need, come back and we can help you find a source. If it is XL, you probably want 3/8 wide, and you can get them lots of places. The other types might be harder to find. On Mon, Mar 10, 2014, at 06:36 PM, Gene Heskett wrote: On Monday 10 March 2014 18:33:35 Brian Morel did opine: Yes, the Pitch Dia. is greater than the OD of the sprocket. take a look at the below link. http://www.brecoflex.com/index.php?CATID=7SCATID=44 Looks good, till I tried to use the belt selector, my browser or their web page is broken as everytime I try to enter a value, it clears all other selections made except the width. So I can't select a 5mm pitch, 9,5mm wide, 72 cog belt. Thanks Brian. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 20:28:53 John Kasunich did opine: Gene: It seems like you're going about this the hard way. The first step is to identify the belt family. Look at the shape of the teeth on the belt. Are they round, or trapezoidal? Take a look at the pictures here: http://www.sdp-si.com/D265/HTML/D265T015.html Given that your pitch is approximately 5mm or 0.2 inches, likely candidates are XL (fig 19c, top row, right end), or 5mm HTD (fig 19f, 2nd row, right end), 5mm GT2 (fig 19i, 3rd row, right end), or T5 (fig 19k, bottom row center). The tooth shape should let you eliminate two of the four possibilities. It is either round (HTD or GT2) or trapezoidal (XL or T5). Definitely trapezoidal. Any markings on the pulleys that wound indicate the type? GT2, HTD, etc? (That would make it too easy.) No mark of that sort POM in one of the casting webs is it. Assuming no markings, next step is to determine the OD of the pulleys for each type. Google found this page: http://www.pfeiferindustries.com/timing-belt-pulley-pitch-diameter-outsi de-diameter-charts-i-12-l-en.html Links on that page lead to PDF files with pulley dimensions for three of the belt types. It didn't have info for T5, but I found another that did. I'll save you the reading - for 30 tooth pulleys, the pitch diameters and outside diameters are: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 Ok, what happens when the pulley OD is (across the teeth) 1.803 ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. Thanks. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 11 March 2014 00:36, Gene Heskett ghesk...@wdtv.com wrote: No mark of that sort POM in one of the casting webs is it. Looks like pretty fresh casting to me. In some sort of black ABS? It's POM :-) http://en.wikipedia.org/wiki/Polyoxymethylene One trade-name for POM is Delrin -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Mon, Mar 10, 2014, at 08:36 PM, Gene Heskett wrote: On Monday 10 March 2014 20:28:53 John Kasunich did opine: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 Ok, what happens when the pulley OD is (across the teeth) 1.803 ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. Hmm, that is mystifying. It's definitely 30 teeth, right? T5 is one of the harder ones to find. XL is everywhere, but it doesn't sound like that is the right type (unless it is really a 29 tooth pulley). What about the other pulley? How many teeth on that one, and what is the OD? -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 03/10/2014 03:55 PM, Gene Heskett wrote: The standard Imperial belts are .080 (MXL), .200 (XL) and .375 (L). The standard metric belts are 3, 5 and 10 mm, but I used some pulleys that needed 2 mm belts, and didn't know until I found the belts walking the teeth of the pulleys. Those are about all the sizes I know of. Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
Sorry to come into the discussion so late. The metric belts seem to have round teeth while the imperial have trapezoidal. Can you check which they are. Bill -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
This struck my interest as I deal with a lot of timing belts at work. There are some rarer trapezoidal profile with 5mm pitch. I just looked at my little 7x lathe and it has the same belt ( 1.5x70 ). I'm not going to be using my lathe until the weather turns, so tomorrow night I'll pull the belt and pulleys to take into work to really investigate. Sent from my iPad On Mar 10, 2014, at 9:10 PM, John Kasunich jmkasun...@fastmail.fm wrote: On Mon, Mar 10, 2014, at 08:36 PM, Gene Heskett wrote: On Monday 10 March 2014 20:28:53 John Kasunich did opine: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 Ok, what happens when the pulley OD is (across the teeth) 1.803 ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. Hmm, that is mystifying. It's definitely 30 teeth, right? T5 is one of the harder ones to find. XL is everywhere, but it doesn't sound like that is the right type (unless it is really a 29 tooth pulley). What about the other pulley? How many teeth on that one, and what is the OD? -- John Kasunich jmkasun...@fastmail.fm -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 20:46:27 Gene Heskett did opine: On Monday 10 March 2014 20:28:53 John Kasunich did opine: Gene: It seems like you're going about this the hard way. The first step is to identify the belt family. Look at the shape of the teeth on the belt. Are they round, or trapezoidal? Take a look at the pictures here: http://www.sdp-si.com/D265/HTML/D265T015.html Given that your pitch is approximately 5mm or 0.2 inches, likely candidates are XL (fig 19c, top row, right end), or 5mm HTD (fig 19f, 2nd row, right end), 5mm GT2 (fig 19i, 3rd row, right end), or T5 (fig 19k, bottom row center). The tooth shape should let you eliminate two of the four possibilities. It is either round (HTD or GT2) or trapezoidal (XL or T5). Definitely trapezoidal. Any markings on the pulleys that wound indicate the type? GT2, HTD, etc? (That would make it too easy.) No mark of that sort POM in one of the casting webs is it. Assuming no markings, next step is to determine the OD of the pulleys for each type. Google found this page: http://www.pfeiferindustries.com/timing-belt-pulley-pitch-diameter-out si de-diameter-charts-i-12-l-en.html Links on that page lead to PDF files with pulley dimensions for three of the belt types. It didn't have info for T5, but I found another that did. I'll save you the reading - for 30 tooth pulleys, the pitch diameters and outside diameters are: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 Ok, what happens when the pulley OD is (across the teeth) 1.803 ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. I should probably add that the pulley's gullies are very close to 1/16 wide, while the teeth are in the .109 range thick. So the cogs on the belt should probably mirror that I'd assume. Thanks. Cheers, Gene Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 22:51:58 andy pugh did opine: On 11 March 2014 00:36, Gene Heskett ghesk...@wdtv.com wrote: No mark of that sort POM in one of the casting webs is it. Looks like pretty fresh casting to me. In some sort of black ABS? It's POM :-) http://en.wikipedia.org/wiki/Polyoxymethylene One trade-name for POM is Delrin I didn't know that, tougher stuff than I had it pegged to be, thanks Andy! Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 22:55:43 John Kasunich did opine: On Mon, Mar 10, 2014, at 08:36 PM, Gene Heskett wrote: On Monday 10 March 2014 20:28:53 John Kasunich did opine: HTD: PD = 1.880 OD = 1.835 GT2: PD = 1.880 OD = 1.835 XL: PD = 1.910 OD = 1.890 T5: PD = 1.880 OD = 1.848 Ok, what happens when the pulley OD is (across the teeth) 1.803 ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. Hmm, that is mystifying. It's definitely 30 teeth, right? Damn John, I just counted it twice more and got 31 both times. At a top of the tooth diameter of 1.803, where the heck does that leave us/me? T5 is one of the harder ones to find. XL is everywhere, but it doesn't sound like that is the right type (unless it is really a 29 tooth pulley). What about the other pulley? How many teeth on that one, and what is the OD? The smaller driver pulley, is .976 across the top of the teeth, and 17 teeth, .388 between the flanges. So a .375 wide belt will fit, as will a 9.5mm wide belt. But a 10mm will be pinched until it burns up the flange anyway. Thanks John. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 23:10:06 Bill did opine: Sorry to come into the discussion so late. The metric belts seem to have round teeth while the imperial have trapezoidal. Can you check which they are. Bill Definitely trapezoidal Bill, thanks. See my msg to JK, the darned thing has 31 teeth! With a tooth top diameter of 1.807 That doesn't fit anything I can find. :( -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 03/09/2014 10:20 PM, Gene Heskett wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. Try to make sure the belt fits the pulley properly. The difference between metric and imperial belt sizes is REALLY small. The worst is MXL, which are .080, and the 2mm counterpart, which is only slightly smaller. But, if you wrap the wrong belt around a larger pulley, the mismatch eventually accumulates so the teeth won't line up all the way around. That could account for the belt being just a bit short. I've run into this. Otherwise, you will probably have to count all the teeth. Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On 03/09/2014 10:20 PM, Gene Heskett wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. Try to make sure the belt fits the pulley properly. The difference between metric and imperial belt sizes is REALLY small. The worst is MXL, which are .080, and the 2mm counterpart, which is only slightly smaller. But, if you wrap the wrong belt around a larger pulley, the mismatch eventually accumulates so the teeth won't line up all the way around. That could account for the belt being just a bit short. I've run into this. Otherwise, you will probably have to count all the teeth. Oh, as for where to get them, cheapest is probably McMaster-Carr, Grainger's also has a supply. They don't have the widest selection, so then there are a bunch of specialty suppliers in the power transmission business that may have tens of thousands of sizes in stock. Jon -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 01:05:49 Jon Elson did opine: On 03/09/2014 10:20 PM, Gene Heskett wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. Try to make sure the belt fits the pulley properly. The difference between metric and imperial belt sizes is REALLY small. The worst is MXL, which are .080, and the 2mm counterpart, which is only slightly smaller. Humm, the only check I have made is to see that a 3/4 way around wrap in the larger, flange less pulley fits well, and it does fit, perfectly. Sine this thing is a Chinese lathe originally, its a pretty safe bet it's metric. With caliper (digital) in hand, I cannot say as to whether the distance between cogs is 4mm, or .160, (only 2 thou difference that my eyes can't see) but that just about fits from cog top to cog top either way. Measuring across 2 cogs of the larger pulley which except for the wallered out keyway is not that badly worn, I get a reading in the 7.09mm to 7.14mm range with the tips squeezing the root of two adjacent cogs. Measuring the valley between cogs, I get a pretty consistent 1.57mm to 1.58mm. But those measurements don't even come close to what I see in the catalogs. As you can imagine, confusion reigns supreme here.. But, if you wrap the wrong belt around a larger pulley, the mismatch eventually accumulates so the teeth won't line up all the way around. They align perfectly when wrapped about 3/4 of the way around on the larger pulley, which carries no markings at all, it has a 10mm bore and a 4mm key broaching, which is odd (std is a 3mm keyway) and raised the price of a metal pulley about $40 because of the tooling change. That pretty much kicked any interest in metal pulleys out the door because I can buy both of the pulleys and the belt about 10 times by the time I'd had a set of metal ones made for around $170. That could account for the belt being just a bit short. I've run into this. Otherwise, you will probably have to count all the teeth. Jon Thanks Jon. -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need longer belt
On Monday 10 March 2014 01:34:28 Jon Elson did opine: On 03/09/2014 10:20 PM, Gene Heskett wrote: Greetings; I have no clue why, but the replacement belt I got from LMS to replace the one I burnt some cogs out of, is now too short by at least 2, maybe 4 teeth. Try to make sure the belt fits the pulley properly. The difference between metric and imperial belt sizes is REALLY small. The worst is MXL, which are .080, and the 2mm counterpart, which is only slightly smaller. But, if you wrap the wrong belt around a larger pulley, the mismatch eventually accumulates so the teeth won't line up all the way around. That could account for the belt being just a bit short. I've run into this. Otherwise, you will probably have to count all the teeth. Oh, as for where to get them, cheapest is probably McMaster-Carr, Ok, I've bought there before. Grainger's also has a supply. They don't have the widest selection, And a useless search engine on their web page, has no clue what a gilmer or timing belt is. so then there are a bunch of specialty suppliers in the power transmission business that may have tens of thousands of sizes in stock. It was one of those that gave me the quote for metal pulleys that took my breath away. Jon Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Learn Graph Databases - Download FREE O'Reilly Book Graph Databases is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
