Somewhat risky for a newb like me to have metal screws in the work area, but I took a chance. All went well until I hit the z-axis limit switches (piss poor planning) in the middle of my job. In the confusion I did the same as before, started the job mid program but I'd done a goto zero. I should have noticed it was heading off inthe wrong direction but I wasn't ready ready to pounce onthe stop button.

The tool scored a direct hit on a holding down screw.

Hopefull no damage to my spindle.Click image for larger version. 

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All seemed to be going well but I've got one concern. The third pocket, is undersized slightly eg 13.85mm instead of 14.0mm in the long axis direction. Does that indicate missed steps?

I ran it again at 70% feed and another sliver got taken off one face, so now 0.10mm undersize rather than 0.15mm.