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How to measure hole on an angle.

Autoing the circle gives me a ellipse.

What's the best way about this? I need diameter and true position.

See the great picture below of a side view

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  • There are so many different ways you can do this. Probably the easiest would be to use vector points in multiple layers and use a best fit recomp cylinder construction.
    Auto and Measured features are still workplane based, so using those tools would be no better than using your current alignment, probe the hole with vector points, ensure your workplace is correct, and construct a 2d best fit recomp circle, which is an option. You could also level to the plane, rotate the alignment the nominal angle, pepper with points and do the 2d circle construction but you're banking on it being actually the correct angle. If you're really feeling frisky, use a perimeter scan at the start and end of the feature and best fit recomp a cylinder
    either way you look at it, a cylinder is the best way to get an accuracy result on the CMM.
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  • There are so many different ways you can do this. Probably the easiest would be to use vector points in multiple layers and use a best fit recomp cylinder construction.
    Auto and Measured features are still workplane based, so using those tools would be no better than using your current alignment, probe the hole with vector points, ensure your workplace is correct, and construct a 2d best fit recomp circle, which is an option. You could also level to the plane, rotate the alignment the nominal angle, pepper with points and do the 2d circle construction but you're banking on it being actually the correct angle. If you're really feeling frisky, use a perimeter scan at the start and end of the feature and best fit recomp a cylinder
    either way you look at it, a cylinder is the best way to get an accuracy result on the CMM.
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