Re: backlash testing

THANKS to all of you! Man this group is Great!
Sounds like I have been doing it right. However I plan to test it
again and try some of the techniques you guys mentioned...never hurts
to check it again!
thanks!
tauseef

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <jmelson@a...> wrote:
>
>
> Hugh Currin wrote:
>
> > Tauseef & all:
> >
> > As I understand backlash it is the slop or free-play between the
lead screw
> > and its nut. In moving right, stopping, then moving left some
lead screw
> > rotation is needed to take up the slop and thus doesn't move the
> > table. This rotation without table motion is backlash?
>
> Yes. It is also called "Lost Motion", as the change on the
handwheel
> dials does not correspond to actual table movement.
>
> > The way I've tried to measure it is to move the table one
direction (say
> > right) until the dial at the lead screw handle reads zero. Then
zero the
> > DRO, or set up an indicator between the spindle and table to read
zero,
> > without touching the lead screw handle. Then move the table the
other
> > direction (left) using the handle very slowly while watching the
DRO (or
> > indicator). Once any motion is seen on the DRO (indicator)
stop. The
> > reading on the lead screw (difference from zero) is the backlash.
>
> Yes, this is a fairly good way to measure it.
>
> Jon