Re: backlash

How about simple pre-loading of the table? I have not tried this on x
and Y axis yet, but when I converted my mini mill to CNC using the Z-
axis microfeed for stepper motor drive, I had almost 60 thou of
backlash. I reduced this to 1 or 2 thou by simply removing the Z-axis
torsion arm, thereby providing a pre-load.


Daya.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, bjammin@i... wrote:
> At 07:55 AM 1/5/03 +0000, you wrote:
> >It could be made to work as long as the control software has a
complete
> >picture of the backlash at all positions on each axis (not just
the average
> >or max value), and as long as it is programmed to interrupt a cut
(in order
> >to change the direction of pre-load) before the direction of cut
changes.
>
> Sorry to sound catergorical, but this *IS* an unequivicaol
response: No, it
> can't be made to work, unless you can program your cutter itself to
not
> pull the table around in different directions relative to the slop.
>
> Regards, Hoyt McKagen
>