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Measuring with multiple tip angles

Nate.N
We are currently working on a cylindrical part which is fixtured with the center of the cylinder parallel to the X axis.

The length of the part is 27.45mm and verified by calipers.

We measure a plane on the edge of the cylinder with tip T1A90B-90 then we measure a plane on the other side of the cylinder with tip T1A90B90.

When reporting the distance from plane 1 to plane 2, it reports at 27.724.

When we measure this distance with T1A0B0, we get 27.488, much closer to nominal and what we are measuring with calipers.

I'm assuming we're missing something regarding the change in tip angles?

Can anyone point out what we're doing wrong? We need to be able to measure this feature, along with all the internal features, using these angles.

Thanks.
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  • When using the 90/±90 angles, have you tried measuring the exact same point to point locations? If so, what is the measurement?

    The short answer to your question is, yes, centroid to centroid; however, other things come into play too (which plane is picked first [it becomes the datum feature], the form of the planes [are they truly parallel to each other, perfect vectors, etc], the alignment, etc.).

    Planes, unlike points, extend to infinity. If one plane is skewed, the 3D measurement will evaluate perpendicular to the 1st plane to the closest intersection point of the 2nd.

    Try turning your graphics on inside the dimension and look at where it intersects the 2nd plane.

    Hope all that makes sense.
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  • When using the 90/±90 angles, have you tried measuring the exact same point to point locations? If so, what is the measurement?

    The short answer to your question is, yes, centroid to centroid; however, other things come into play too (which plane is picked first [it becomes the datum feature], the form of the planes [are they truly parallel to each other, perfect vectors, etc], the alignment, etc.).

    Planes, unlike points, extend to infinity. If one plane is skewed, the 3D measurement will evaluate perpendicular to the 1st plane to the closest intersection point of the 2nd.

    Try turning your graphics on inside the dimension and look at where it intersects the 2nd plane.

    Hope all that makes sense.
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