Re: Ballscrew installation issues

It is my experience that those mc master carr 13/64 Pitch ballscrews are
.200 pitch. They are generally made by Thompson.
Dan
-----Original Message-----
From: Roger Brower <rbrower@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Sunday, February 20, 2000 1:27 PM
Subject: [CAD_CAM_EDM_DRO] Ballscrew installation issues

>From: Roger Brower <rbrower@...>
>
> stratton@... Wrote:
>
>Subject: Ballscrew installation issues
>
>>My plans for lathe conversion are
>progressing. snip...
>>What size (series/pitch) timing belts
>are people typically using?
>
>.2 pitch x 3/8 XL belts w/ 60 tooth
>steel & polycarbonate pulleys 1:1
>Berg and Stock Drive show more variety
>than McMaster-Carr, but the prices
>aren't listed in the catalogs.
>
>>With a .200 lead screw and a 200 step/r
>motor I need 2:1 reduction
>just to get steps of .001, but am
>planning on going for .0005 or
>.00033 if I use a 10 tooth driving a 60
>tooth.
>
>You may well end up using a half step
>driver for increased torque and reduced
>resonance reasons.
>A 200 step per rev motor is 400 discrete
>half steps per rev.
>Also note the McMaster 5/8 screws are
>31/64" pitch; with 1:1 drive, I
>calculate: 1.8 deg per step motors, 200
>steps per rev, 400 steps per rev half
>step mode;
>13/64" screw lead =(.203125 inch per
>rev, or 4.9230769 rev per inch)
>So: .203125 / 400 = ~1969(.2792) steps
>per inch for ~.0005 resolution.
>
>Am I in some kind of trouble with this
>odd number (vs 2000)?
>I know CNCPro can't use the decimal
>remainder (.2792) on steps per rev
>setting.
>I didn't want to gear it down and lose
>the travel speed potential or, God
>forbid, lose steps by trying to spin the
>motors too fast...
>
>
>
>
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