[manton]

So you don't have a dial test indicator, or other dial indicator that you could use to measure the actual travel?

You may want to put in some code for a finish pass, to make sure some of your inaccuracy isn't machine/tool bending.

[CodeMonkeyDan]

I do not have a dial test indicator...maybe worth a trip to the store this weekend.

Was counting on the cncfusion setup to reduce backlash to a point I didn't need to worry about it.

[manton]

Another source of backlash is the preload on the thrust bearings for the ballscrews. I wonder how they have done this, and if it is easy to adjust?

A dial test indicator is always useful to have. You need it to dial in a vise accurately as well, so it is worth getting one. They can be had for around $30 if you don't mind one of the made in China variety.

[RPCElectronics]

Use a brass hammer. A small sharp tap will knock the collet loose without damaging the drawbar hex and without shaking the machine.

I actually use the wrench that I use to loosen the collet. I just tap two or three times on the top of the drawbar nut and it always pops loose. I'm not exerting any major force on it, just get a few "clinks" out of it