ACME ( was Re: leadscrew, acme screw, threaded rod, ballscrew

<snip>

> Backlash settings in a CNC control are pretty much a "patch" to

make

> something really bad a little better. I know of some Control

developers

> who only added it because people thought it would fix all their
> problems.. Suprise ! It won't.
>
> Get rid of backlash, get anti-backlash nuts and build a tight

system. If

> you need even tighter, spend more. You can get it. Then you won't

be

> disapointed when climb milling circles. But you can't get it by

taking

> cheap stuff and fiddling with it.
>
> CL

This is where we all start to agree.

if you are milling a circle for a bearing, there ain't no good way to
do it when backlash is involved. each transistion from + to - on
any axis will show the errors.

There is nothing neater than to put in 5 lines of code and get a hole
that is a press fit.

on the flip side, if you don't mind boring it, milling a rough cut to
within 10 thou is pretty darn cool in it's own.

software is a patch as the table itself can move, and the cutter can
move the table against the slop ! Slop being collective
innaccuracies.