Re: interface board

On Mon, 10 May 1999 13:55:16 -0500, Jon Elson <jmelson@...>
wrote:

>Well, I really don't think it would be that big of a project. But, knowing that,
>I went with precision ballscrews and relatively cheap shaft encoders. You
>can get a much greater resolution that way. A leadscrew with .200" lead
>(5 TPI) and a 1000 line encoder (counting all transitions for 4000 counts/rev)
>gives resolution of .00005" per count. If you can get a .100" lead screw
>(I have one for the Z (quill) axis) you get .000025" per count - that's 25
>micro inches. Great for EDM feed.

Good point. Lack of lash in the screws sure DOES help out in other ways,
don't it! And if you used steppers on those screws, at those
resolutions, you would even get to watch the motors twitch! B)

Gar