Re: Any simple way to map ballscrews?

Hello,

1)Rent a laser interferometer<G>

2)Borrow a linear scale DRO from another tool.

3) Use a 12" dial caliper to miniminse the inchworming. (Come back to
any especially bad areas with the DI in the spindle)

4) Mount a scribe in the spindle and mark a blued piece of plastic or
aluminum. (Write a g code program to place 255 "lines" in this marker
strip along your axis travel. I think that's the number of corrections
Mach allows?) This will give a faster rough result, but likely won't be
as accurate as the others.

In any case, beware af angular--abbe--errors.

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor" <vrsculptor@...>
wrote:

>
> Mach3 (and I'm pretty sure EMC) allows you to enter a leadscrew
> compensation table to correct for errors in the leadscrew pitch. Does
> anyone have any sugestions on how to measure the error other than
> using a dial indicator in the spindle, a block on the table and inch
> worming down the length of the table. I'm looking at using rolled
> ballscrews that can vary as much as .007 a foot.
>
> Roger
>