Re: [Emc-users] xl pulleys

2016-09-21 Thread Chris Albertson
All the belt suppliers like Gates, have web sites with engineering data. If you know your requirements (torque, power rpm) then yo add a safety factor of about 2.5 then select the parts. If you do this then with either belt type you should be able to stall your motor. This paper is like the

Re: [Emc-users] xl pulleys

2016-09-21 Thread Gene Heskett
On Wednesday 21 September 2016 01:15:54 Chris Albertson wrote: > Actually drilling the timing belt is not a bad idea. The older MXL > type belts used a trapezoid tooth belt but the new high torque "HTD" > Designs use circular profile teeth.They really are bater and > transmit more torque

Re: [Emc-users] xl pulleys

2016-09-20 Thread Chris Albertson
Actually drilling the timing belt is not a bad idea. The older MXL type belts used a trapezoid tooth belt but the new high torque "HTD" Designs use circular profile teeth.They really are bater and transmit more torque with less belt tension required. Even newer designs are GT2 and GT3 and

Re: [Emc-users] xl pulleys

2016-09-20 Thread Gene Heskett
On Tuesday 20 September 2016 17:20:32 Martin Dobbins wrote: > Gene wrote: > >The ball end wouldn't be the tool for the job as the bottom of the > > gullet has sharp corners except for the OEM belt of a 7x12. And > > there >are 2 common face angles in >use and I've not the memory to > > quote

Re: [Emc-users] xl pulleys

2016-09-20 Thread Martin Dobbins
Gene wrote: >The ball end wouldn't be the tool for the job as the bottom of the gullet has >sharp corners except for the OEM belt of a 7x12. And there >are 2 common face >angles in >use and I've not the memory to quote whether its 14.5 degrees or 20 >degrees for the face angle per belt tooth

Re: [Emc-users] xl pulleys

2016-09-20 Thread Gene Heskett
On Tuesday 20 September 2016 14:29:57 Chris Albertson wrote: > I'm surprised you can cut XL pulleys with a hob. It does not look > like the teeth are right for that to work.If I had to make an XL > pulley from scratch, I'd guess the best way would be to use a 4-axis > machine and a ball-end

Re: [Emc-users] xl pulleys

2016-09-20 Thread Dave Cole
On 9/20/2016 3:45 PM, andy pugh wrote: > On 20 September 2016 at 22:37, Dave Cole wrote: > >> Are there lots of small vans around you? ;-) > > There are. Many half-completed at any one time. > Ha ha.. so that's why you are there They need help! :-)

Re: [Emc-users] xl pulleys

2016-09-20 Thread andy pugh
On 20 September 2016 at 22:37, Dave Cole wrote: > Are there lots of small vans around you? ;-) There are. Many half-completed at any one time. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical

Re: [Emc-users] xl pulleys

2016-09-20 Thread Dave Cole
Turkey! Are there lots of small vans around you? ;-) Dave On 9/20/2016 1:53 PM, Andy Pugh wrote: > > On 20 Sep 2016, at 03:00, Gene Heskett wrote: > >>> I have the hob to make T5 pulleys. >> Yeah, but my GMC doesn't have pontoons and paddlewheels. ;-) > You could send a

Re: [Emc-users] xl pulleys

2016-09-20 Thread Gene Heskett
On Tuesday 20 September 2016 13:53:17 Andy Pugh wrote: > On 20 Sep 2016, at 03:00, Gene Heskett wrote: > >> I have the hob to make T5 pulleys. > > > > Yeah, but my GMC doesn't have pontoons and paddlewheels. ;-) > > You could send a drawing, but I think that my turnaround

Re: [Emc-users] xl pulleys

2016-09-20 Thread andy pugh
On 20 September 2016 at 21:29, Chris Albertson wrote: > I'm surprised you can cut XL pulleys with a hob. I don't know if you can, but my hob is for T5. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of

Re: [Emc-users] xl pulleys

2016-09-20 Thread Chris Albertson
I'm surprised you can cut XL pulleys with a hob. It does not look like the teeth are right for that to work.If I had to make an XL pulley from scratch, I'd guess the best way would be to use a 4-axis machine and a ball-end mill. That is one reason I'm wanting to add a motor to my rotary

Re: [Emc-users] xl pulleys

2016-09-20 Thread Andy Pugh
On 20 Sep 2016, at 03:00, Gene Heskett wrote: >> >> I have the hob to make T5 pulleys. > > Yeah, but my GMC doesn't have pontoons and paddlewheels. ;-) You could send a drawing, but I think that my turnaround time would be a problem as I am in Turkey until the weekend

Re: [Emc-users] xl pulleys

2016-09-19 Thread Gene Heskett
On Monday 19 September 2016 13:53:23 Andy Pugh wrote: > > On 19 Sep 2016, at 08:09, Gene Heskett wrote: > > > > Do any of you know of a pulley maker that can supply a large hub in > > in a 40 tooth pulley that is also more than an inch wide at the hub? > > I have the hob to

Re: [Emc-users] xl pulleys

2016-09-19 Thread Gene Heskett
On Monday 19 September 2016 12:54:00 Jon Elson wrote: > On 09/19/2016 12:09 AM, Gene Heskett wrote: > > Greetings all; > > > > Do any of you know of a pulley maker that can supply a large hub in > > in a 40 tooth pulley that is also more than an inch wide at the hub? > > I always buy my pulleys

Re: [Emc-users] xl pulleys

2016-09-19 Thread Andy Pugh
> On 19 Sep 2016, at 08:09, Gene Heskett wrote: > > Do any of you know of a pulley maker that can supply a large hub in in a > 40 tooth pulley that is also more than an inch wide at the hub? I have the hob to make T5 pulleys.

Re: [Emc-users] xl pulleys

2016-09-19 Thread Jon Elson
On 09/19/2016 12:09 AM, Gene Heskett wrote: > Greetings all; > > Do any of you know of a pulley maker that can supply a large hub in in a > 40 tooth pulley that is also more than an inch wide at the hub? > > > I always buy my pulleys with undersize bores and bore them out. Stock sintered pulleys

Re: [Emc-users] xl pulleys

2016-09-19 Thread Gene Heskett
On Monday 19 September 2016 06:56:00 Rick Lair wrote: > Check this place out Gene, > > http://www.hmmanufacturing.com/pulley-stock1.html > > I just bought some stuff from there, good quality, great price. We > have a situation on our edm machine where the standard sheaves > available weren't wide

Re: [Emc-users] xl pulleys

2016-09-19 Thread Rick Lair
Check this place out Gene, http://www.hmmanufacturing.com/pulley-stock1.html I just bought some stuff from there, good quality, great price. We have a situation on our edm machine where the standard sheaves available weren't wide enough, and I found these guys. Hope it helps, Rick On

Re: [Emc-users] xl pulleys

2016-09-19 Thread Gene Heskett
On Monday 19 September 2016 02:22:49 Dave Caroline wrote: > HPC gears in the UK make pulleys in the same way as I do and list the > intermediate stage in their catalogue, see > http://www.hpcgears.com/n/products/15.toothed_bar_stock/toothed_bar_st >ock.php > > or make a hub assembly and press fit

Re: [Emc-users] xl pulleys

2016-09-19 Thread Dave Caroline
HPC gears in the UK make pulleys in the same way as I do and list the intermediate stage in their catalogue, see http://www.hpcgears.com/n/products/15.toothed_bar_stock/toothed_bar_stock.php or make a hub assembly and press fit any gear on Dave Caroline

[Emc-users] xl pulleys

2016-09-18 Thread Gene Heskett
Greetings all; Do any of you know of a pulley maker that can supply a large hub in in a 40 tooth pulley that is also more than an inch wide at the hub? I find that to align a belt on the X drive, that I have to find a pulley with an 8mm bore, but around 2" wide at the hub, because I am going