Re: [Emc-users] Broaching this screw.
On 21 July 2012 05:21, Gene Heskett ghesk...@wdtv.com wrote: It looks like I am stuck with the 3.5mm allen socket to drive this. I can't help feeling that a Torx head would be easier to make,as it is just about mill-able. It might take some experimenting and tweaking (maybe in a block of plastic) to get the shape right, though. 2. I have a live center for this mini-lathe, and if I really really snug down the tailstock clamp, it might make 200 + lbs of push. Likely not enough to push it straight in. You could perhaps augment the tailstock clamp with things clamped to the bed behind it. If it fails, you could probably finish it off with a hammer…. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On Saturday 21 July 2012 10:51:04 andy pugh did opine: On 21 July 2012 05:21, Gene Heskett ghesk...@wdtv.com wrote: It looks like I am stuck with the 3.5mm allen socket to drive this. I can't help feeling that a Torx head would be easier to make,as it is just about mill-able. With sub .03125 mills. Some slop in the grooves is probably un-avoidable with any mill that can reach 4mm depth in a straight plunge cut. Probably made dangerous for that small a mill as the post sled way on my mill has developed a stiction problem and descends in .002 increments of late when moving at creep speeds. No amount of gib adjusting seems to effect it, but drowning in it vactra fixes it for 5 minutes maybe. There are a lot of hours on this mill, one gear has wobbled out the keyway in its hub already, and its getting very noisy again. The bearings seem to be holding up, better than I expected since you have to beat on the end of the draw bolt to change tooling with a couple lbs of steel, but those plastic gears have got to go. I'm going deaf listening to them. Thinking on milling it, I think it would be better to drill the hole pattern, and use that same teeny drill to put a pilot hole in the center, then drill out the center with very sharp bits. I'll play with some plastic today just for SG's. It might take some experimenting and tweaking (maybe in a block of plastic) to get the shape right, though. Humm, some of that micarta I made the pcb palate from might do. HDPE has buckets of spring back as I found when I went to make some faces for the fence on my router table. This micarta throws up a ridge around a tapped hole, but at least it stays thrown up, the screw does fit the hole. So I drill tap, then mill the pocket, which mills away the ridge where it counts. That was also my original thought Andy, until I went looking for specs on the torx form that I could write gcode from. Either my google fu is bad, or its proprietary unpublished. Its not mentioned at all in my Machinery's Handbook either, issue #27. Unk if its included in newer versions. If you have a URL to a spec for the torx stuff, I'd sure appreciate it. 2. I have a live center for this mini-lathe, and if I really really snug down the tailstock clamp, it might make 200 + lbs of push. Likely not enough to push it straight in. You could perhaps augment the tailstock clamp with things clamped to the bed behind it. That would be tried if I can't hold it with the bolt/square plate washer it uses now. TBT, that square plate needs to be, and there is room for it, twice as thick. If it fails, you could probably finish it off with a hammer…. Either way, I'll have to chuck up a block of something and drill tap a 7mmx1.00 hole to hold it against the beating. If I give it a good coat of moly sulfide grease, I should be able to unscrew it from the scrap even it this drill rod expends a hair in the process. But first we play with some plastic. 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Computers are useless. They can only give you answers. -- Pablo Picasso -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On Saturday 21 July 2012 11:37:54 andy pugh did opine: On 21 July 2012 05:21, Gene Heskett ghesk...@wdtv.com wrote: It looks like I am stuck with the 3.5mm allen socket to drive this. I can't help feeling that a Torx head would be easier to make,as it is just about mill-able. It might take some experimenting and tweaking (maybe in a block of plastic) to get the shape right, though. 2. I have a live center for this mini-lathe, and if I really really snug down the tailstock clamp, it might make 200 + lbs of push. Likely not enough to push it straight in. You could perhaps augment the tailstock clamp with things clamped to the bed behind it. If it fails, you could probably finish it off with a hammer…. And I just now did hit a page with some size specs. Looks like T15 is as big as I can shoot for. The thru hole in the extension is a good fit for a 3.5 mm allen wrench. Drilling it out to 3.8 for a T-20 would be pushing my luck. T-15 is .128 across the peaks. This is gonna be fun I suspect, depending on ones definition of fun... 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Is this the line for the latest whimsical YUGOSLAVIAN drama which also makes you want to CRY and reconsider the VIETNAM WAR? -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On 21 July 2012 16:44, Gene Heskett ghesk...@wdtv.com wrote: And I just now did hit a page with some size specs. Looks like T15 is as big as I can shoot for. The thru hole in the extension is a good fit for a 3.5 mm allen wrench. Broach it hex then, it can't be _that_ hard. Just don't do your real part first. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On Saturday 21 July 2012 12:55:27 andy pugh did opine: On 21 July 2012 16:44, Gene Heskett ghesk...@wdtv.com wrote: And I just now did hit a page with some size specs. Looks like T15 is as big as I can shoot for. The thru hole in the extension is a good fit for a 3.5 mm allen wrench. Broach it hex then, it can't be _that_ hard. Just don't do your real part first. A given. I'll cut off half an inch of this drill rod and try that 2nd. First will be a piece of hard plastic like micarta. 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Why doesn't DOS ever say EXCELLENT command or filename! % DOS Tip of the Day: Add BUGS=OFF to your CONFIG.SYS file. -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On Saturday 21 July 2012 22:14:28 Gene Heskett did opine: On Saturday 21 July 2012 12:55:27 andy pugh did opine: On 21 July 2012 16:44, Gene Heskett ghesk...@wdtv.com wrote: And I just now did hit a page with some size specs. Looks like T15 is as big as I can shoot for. The thru hole in the extension is a good fit for a 3.5 mm allen wrench. Broach it hex then, it can't be _that_ hard. Just don't do your real part first. A given. I'll cut off half an inch of this drill rod and try that 2nd. First will be a piece of hard plastic like micarta. Cheers, Gene I got it done, not once but twice, second time in the real screw. Then I did a boo-boo after making a 7mm tapped pocket to hold the screw, I mounted the drill bit, dropping its diameter about 6 thou, and thinking in mm that I needed to drill maybe 7mm into the end of it, zeroed the z without checking to see if it really was, fed the bit in, glance at the dro occasionally but always seeing it as -2.something, so I kept on boring. When I realized the display was in inches and that there must have been a previous touch off in effect. The net effect is that I bored to far and broke the screw at the size change. That made it beer thirty I was one behind. My biggest problem was that 3.5mm wrench, is damned near made out of unobtainium, I check Advance Auto, TSC and finally found 2 pocket kits at Lowes with a 3.5mm. That turned out to be damned hard stuff, and my lathe drove it in 4 to 5mm very easily with about a 1/8 tail stock offset. Veddy tight though, took a pair of BIG vice grips and a hammer to remove the key piece both times. Without resorting to driving it back in with a hammer, it only goes back in about 1mm. So, I guess tomorrow I re-rig and sharpen my thread cutter, and make another screw. Then its probably going to slow for a day or 3 because I have no clue how much nose I'll come home with Monday. Squamus Cell they called them this time. Several small ones. 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Minimum charge for booths. -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
What about torch heating the end and hot forging with the (cold) driver of your choice? Perhaps start with a full depth pilot hole so the forging tool doesn't have to displace as much material. You could then quench and temper to preference. Jason On Jul 21, 2012 9:32 PM, Gene Heskett ghesk...@wdtv.com wrote: On Saturday 21 July 2012 22:14:28 Gene Heskett did opine: On Saturday 21 July 2012 12:55:27 andy pugh did opine: On 21 July 2012 16:44, Gene Heskett ghesk...@wdtv.com wrote: And I just now did hit a page with some size specs. Looks like T15 is as big as I can shoot for. The thru hole in the extension is a good fit for a 3.5 mm allen wrench. Broach it hex then, it can't be _that_ hard. Just don't do your real part first. A given. I'll cut off half an inch of this drill rod and try that 2nd. First will be a piece of hard plastic like micarta. Cheers, Gene I got it done, not once but twice, second time in the real screw. Then I did a boo-boo after making a 7mm tapped pocket to hold the screw, I mounted the drill bit, dropping its diameter about 6 thou, and thinking in mm that I needed to drill maybe 7mm into the end of it, zeroed the z without checking to see if it really was, fed the bit in, glance at the dro occasionally but always seeing it as -2.something, so I kept on boring. When I realized the display was in inches and that there must have been a previous touch off in effect. The net effect is that I bored to far and broke the screw at the size change. That made it beer thirty I was one behind. My biggest problem was that 3.5mm wrench, is damned near made out of unobtainium, I check Advance Auto, TSC and finally found 2 pocket kits at Lowes with a 3.5mm. That turned out to be damned hard stuff, and my lathe drove it in 4 to 5mm very easily with about a 1/8 tail stock offset. Veddy tight though, took a pair of BIG vice grips and a hammer to remove the key piece both times. Without resorting to driving it back in with a hammer, it only goes back in about 1mm. So, I guess tomorrow I re-rig and sharpen my thread cutter, and make another screw. Then its probably going to slow for a day or 3 because I have no clue how much nose I'll come home with Monday. Squamus Cell they called them this time. Several small ones. 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Minimum charge for booths. -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Broaching this screw.
On Saturday 21 July 2012 23:09:13 Jason Burton did opine: What about torch heating the end and hot forging with the (cold) driver of your choice? Because the broach would be hot very fast. This actually works fairly well cold except its pretty snug I have to get serious to get it bounced back out. I haven't checked the fit, but its possible the 3.5mm tool would make a socket that a 1/8 sae wrench would fit, I may try that tomorrow see how schloppy it is. Perhaps start with a full depth pilot hole so the forging tool doesn't have to displace as much material. That 6 or 7mm I thought I ws drilling into it was plenty of clearance for the broach to displace the materiel in front of it. The problem is that my mind was in mm's but the display was in inches and I had drilled about 3x deeper than I should have by the time I had the 'Duh' or senior moment. The damage is done now, so all I can do is make another one. Call it my Martian mistake. Mixing matching inches mm's is bad karma for me. You could then quench and temper to preference. I don't have a real good way to heat. Mapp gas I have, but with the dime store valves in those things its hopeless, can't be adjusted for a good flame. I am a pretty good gas welder too but when I retired, somebody got away with the gas bottles I kept at the tv station to run my smith wrench with. I have a mig kit too, but that doesn't lend itself to heating at all well either. [...] 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Tart words make no friends; a spoonful of honey will catch more flies than a gallon of vinegar. -- B. Franklin -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Broaching this screw.
Which is made from drill rod, untreated. It looks like I am stuck with the 3.5mm allen socket to drive this. I see some carbide broaches on the net, mostly for quite heavy prices. 1. My mill hasn't the ability to drive even a wobbler as its all tapped out at about 150 lbs of push. 2. I have a live center for this mini-lathe, and if I really really snug down the tailstock clamp, it might make 200 + lbs of push. Likely not enough to push it straight in. But what if I drill a dimple in the end of the key to keep it on the point of the live center, with this screw screwed into a piece of scrap centered in the chuck, drilled with a 3.5mm bit 12mm or so into it, then place the sharpened allen bit piece between the screw and the tail stock, and offset the tail stock several thou. Starting the spindle would provide the wobble needed to do it one corner of the wrench at a time. Is this workable or do I need magnitudes more pressure and a carbide cutter? Thanks Guys. 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) My web page: http://coyoteden.dyndns-free.com:85/gene is up! Windows is a pane in the ASCII. -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
