Re: Backlash

The backlash is the same regardless of where in the travel the
ballscrew/nut is. For the backlash to be caused by flexing, the
ballscrew would have to deflect .215". I can garentee that the
ballscrew is not flexing that much. As for twisting, the pully in the
video rotates almost 4 degrees before the table starts to move. The
table takes about 40 pounds of pressure to get it moving and about 5
pounds to keep it moving. Hiwin said their ballscrew have a working
range well over 400 pounds.

Vince

>
> If you do the test with the screw fully extended and fully retracted
> can you not differentiate between flexing/twisting of the screw and
> flexing of the yoke. Maybe even extrapilate the error back to an
> effectively zero length screw to filter out ther screw error.
>
> Regards
> Phil