Quote Originally Posted by JOGARA View Post
Still having problems with accuracy.

I have my custom vice jaws that hold my case parts. I use the probe to touch off for origin.
I then run a small test cut to double check and it is usually 0.1-0.2mm out in Y.
I then test again and looks fine.

Remove part from vice and replace with same part, and for some reason the X is now out by quite a bit. 0.3-0.5mm from the looks of it.
I know the vice clamping down on the part does make it bend slightly. But I am only going finger tight to reduce this.

Any ideas?

Literally the last operation on the part to chamfer it. I would do it by hand if I could but I also have to drill holes for bolt heads.
You're using a drill vice, you're never going to get repeatability out of it, 0.1-0.3 isn't bad considering. They don't close evenly, the jaws don't shut parallel, they push the work up when they close and as you've mentioned because your part is thin it's susceptible to bending.

As I mentioned before, a jig plate would be a far more suitable fixture for the 2nd setup. Once made it would be much quicker to set up and a lot more accurate and repeatable.