Re: home/limit switches - combined

["Joel Jacobs" <jj-at-spyparts.com>]

----- Original Message -----
From: Matt Shaver <mshaver-at-erols.com>

> If the software limits don't stay relative to machine zero, then that's
> a bug that needs to be fixed. You might try G92, rather than G10L2Pn, as
> a workaround until this can be fixed.

I had some time to play around with the machine again tonight and I could
not get the soft limits to do what I thought they did before - they seem to
stay at machine zero with g1 l2 p#  or g92.  This is good - but I feel bad
now for saying they were moving.  I'm sorry bout that.  I think what I was
seeing was actually due to the homing problem I have.

It seems like the backlash setting is the culprit.  If I enter 0.0 backlash
everything is perfect - homes to the swich - backs off 0.1 to get off the
switch and stops.  I can press 'home' repeatedly and it stops within .001"
each time.

If I enter my .014 backlash it gets confused.  I'll home it, set the
incremental jog to .001, hit the jog and it moves .063!  After that first
move it moves .001 each time but here is where it gets wierd, if I home it
again it'll home offset almost .200 instead of .1.  I'll try the incremental
.001 jog and it'll go over .1.  Now if I try to home again I get the message
"- limit exeeded' (my soft limit is -0.15) I haven't got a clue whats
wrong - either I got something wrong with my system or everybody else is
using zero backlash ball screws and doesn't see the problem.  Could you
maybe set some backlash on your machine and see if you get this wierd
behavior too?

Thanks...

Joel