Re: [CAD_CAM_EDM_DRO] move error in MACH3

Check the finish on your acme screw. If it's rough you're just going to
keep wearing out the plastic nuts.

On 12/04/2012 09:08 AM, chuck merja wrote:
> Well, this is embarrassing. To quote John Wayne, "Life is
> hard......It's harder when you're stupid" ufduh.... but I now know the
> problem...
>
> Last night I decided to check the backlash for myself, and it is 0.045"
> and was set at 0.0" in MACH and observed but not understood on Sat with
> repeated moves in MDI that were coming up 0.045 short of target (moving
> back and forth, and thus experiencing backlash).
>
> So disappointed in my plastic nut! I am pretty sure we measured this at
> just a couple thousandths backlash when we put it together several
> months ago.
>
> So has anyone had luck with plastic antibacklash nuts on ACME threads?
> Again, I thought I was good with just a threaded plastic piece, but now
> I think I'm going to disassemble, slit it perpendicular to screw axis
> and use screws to pull the two halves together. I really don't want to
> through several hundred more $$ at this X2 in the form of ballscrews,
> cuz it is really too small for what we need to do. I could live with an
> X3 sized machine, but...
>
> THANKS for ALL your help!!
> Chuck