RE: [CAD_CAM_EDM_DRO] BALLSCREWS QUESTION

Well, think about your ratios-you would need a 10:1 ratio on the number of
teeth on each cog/pulley to get a 10:1 speed reduction. If you started with
a 10-tooth XL pulley(0.637" Pitch Diameter) you would have to mate it with a
100-tooth pulley(6.37" Pitch diameter). I don't know for sure if you can
find these large-tooth count cogs. And it might not be possible to fit them
in if you can.

Also, remember that if you put the pulleys close together, the smaller cog
will have much less belt wrapped around it, which could be detrimental to
the teeth on the belt. I think you want as much wrap around each pulley as
you can get, so the load is(theoretically at least) spread over many teeth
on the belt.

That's the way I understand it, anyway.

Andy Wander
Verrex Corporation


-----Original Message-----
From: Terrenoire, Adrien L [mailto:TerrenoireAL@...]
Sent: Monday, January 24, 2005 3:05 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] BALLSCREWS QUESTION



Ron,

Why would a 8:1 or 10:1 need to be a 2 step reduction? Is it to reduce
belt friction (more belt wrap on the large gear) or is it a moment of
inertia concern (large diameter gear = geometrically larger I). I'm
guessing the latter but just looking for confirmation.

Regards,

Adrien

-----Original Message-----
From: R Rogers [mailto:rogersmach@...]
Sent: Monday, January 24, 2005 2:10 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] BALLSCREWS QUESTION