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There's a lot going on here.
I would look into a few fundamental thoughts before red-tagging it, especially if it's a sample set of a larger lot or batch.
1: Can you affirm the OOS condition using another means? I know 0.0008" / 0.020mm is too tight to determine with a caliper, but i'm sure if you throw it on a surface plate with a v-block and indicate the ID while spinning the part, you'd be able to affirm concentricity to the OD with ease.
Note: if both cylinders are tri-lobed this could potentially be invisible in a v-block, so look at your form error plots of the circles for patterns/lobing.
2: How is it manufactured?
3: What kind of screwup during manufacture, could have caused this condition?
4: How could it have been manufactured and brought to you as presumably acceptable?
Another possible contributor is your probe itself. Since it's such a small diameter, I'm guessing you are using a smaller probe? 1mm? the Probe diameter-to-shank clearance for a 1mm probe is miniscule (the 1mm probe with TC shank gives you just 0.010" between the shank and the edge of the sphere, when it's made perfectly) and something like a glob of glue at the sphere, or a slightly bent tip, no matter the calibration results of that probe can interact when you start probing at a depth into the part.
If you don't assign a rotational datum, the demon simply refers to the rotation as being square to the machine's volume, about your local level plane. The floating tetrahedron animation in the graphic view is a tool to make sure you clearly isolate all 6DOF to the part's constraints. If there's no rotational datum on the print, technically, you don't need to establish one in the alignment, unless you are trying to lock down a possible issue with the part or method.
There's a lot going on here.
I would look into a few fundamental thoughts before red-tagging it, especially if it's a sample set of a larger lot or batch.
1: Can you affirm the OOS condition using another means? I know 0.0008" / 0.020mm is too tight to determine with a caliper, but i'm sure if you throw it on a surface plate with a v-block and indicate the ID while spinning the part, you'd be able to affirm concentricity to the OD with ease.
Note: if both cylinders are tri-lobed this could potentially be invisible in a v-block, so look at your form error plots of the circles for patterns/lobing.
2: How is it manufactured?
3: What kind of screwup during manufacture, could have caused this condition?
4: How could it have been manufactured and brought to you as presumably acceptable?
Another possible contributor is your probe itself. Since it's such a small diameter, I'm guessing you are using a smaller probe? 1mm? the Probe diameter-to-shank clearance for a 1mm probe is miniscule (the 1mm probe with TC shank gives you just 0.010" between the shank and the edge of the sphere, when it's made perfectly) and something like a glob of glue at the sphere, or a slightly bent tip, no matter the calibration results of that probe can interact when you start probing at a depth into the part.
If you don't assign a rotational datum, the demon simply refers to the rotation as being square to the machine's volume, about your local level plane. The floating tetrahedron animation in the graphic view is a tool to make sure you clearly isolate all 6DOF to the part's constraints. If there's no rotational datum on the print, technically, you don't need to establish one in the alignment, unless you are trying to lock down a possible issue with the part or method.
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