Hello,

Recently I made a part that required a precise 1.5mm deep pocket. Due to the shape of the pocket I had to use 3 different tools, a 1/2" CRB 3FL to face the stock down, then a 3/8" and a 1/16" to make the pocket. When I finished the part, the pocket was 1.05mm. I use the Tormach ETS to set everything in Z(tool lengths, work offset, etc), and a Haimer on X/Y.

I did some repeated tool length tests with the ETS and the same tool in the spindle, and found the ETS to be very repeatable, down to 0.007mm or less.

Since this looked fine, I then moved on to doing a 'touch off entire tray' which I always do after every REF X/Y/Z before making a part. Here I saw some issues. While mostly repeatable, I saw a few errors where part lengths would come out up to ~0.5mm different, including the tools I was using for the pocket. I assume this could be the source of my error.

Has anyone experienced this and what level of Z repeatability do you get with your ATC? Is there anything I should check/adjust?

Thanks in advance.