backlash & feedback, is there a strain gauge cure?

... the fact remains that you can't program out slop in a CNC machine no matter how clever you are. Any backlash...

John

I claim that you can, with a 2nd driven element.

For example, check out: www.physikinstrumente.com/en/products/pr...il.php?sortnr=202700 .

Two of the given application examples are "Active Vibration Control", and "Active Tool Control".

I'm pretty sure that you can get the slop down to about 10um, without too seriously impacting the friction.

After all, the trivial anti-backlash solution is to make the nut too tight to turn.