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Issues with measuring holes at 90 degrees.

I've never been able to get this to work. Everything works great when I'm measuring holes level to the surface plate, but as soon as I articulate the probe to A90B0, A90B90, or any other combination, all of my holes come out at least .010" shifted from the actual values. 

I'm guessing it's something to do with my alignment, but it seems like I've tried everything. I've used the normal level, created a plane on that 90deg surface and leveled to that, articulated the probe first before measuring the plane and then leveling to that, and I'm just stuck and don't know how to get this to work. Can't find any other forum posts relating to this problem.

The main issue here is I'm forced to re-fixture the part 6 different times and write 6 different programs just to check every hole in every face. It's extremely time consuming and I'm hoping someone has an easy solution that I'm completely missing.

I can write a quick program just showing the issue if that helps.

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