True Position of Circle on Cylinder at Compound Angle

In lieu of using 3D CAD data if XYZ and IJK values are provided can PC-DMIS measure a circle on a cylinder that is located on a compound angle? Can the distance from the measured circle center-point to nominal axis of the cylinder be reported? Can the true position of the circle center-point from the nominal axis of the cylinder be reported?

I have a strong background in GD&T, metrology, and gaging but I am not a CMM programmer and I am having extreme difficulty getting true position data from the straight sections of a tube that has several bends all on compound angles. Thank you in advance for your time, consideration, and any help or advise you can provide.

Glenn

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Doug Schueneman over 5 years ago

You can do true position on the cylinder (straight section of your tube) without creating a circle. Just make sure that the nominal data for the cylinder is XYZ, IJK, DIA, is all correct.

If, for some reason, you want or need to get a circle from some station along that cylinder I would recommend;
Measure the straight as a cylinder
Program in a Generic Feature - Plane with the XYZ, and IJK of the nominal circle.
Intersect the cyliinder and the generic plane to get the circle.
Evaluate that for true position as needed.
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Doug Schueneman over 5 years ago

You can do true position on the cylinder (straight section of your tube) without creating a circle. Just make sure that the nominal data for the cylinder is XYZ, IJK, DIA, is all correct.

If, for some reason, you want or need to get a circle from some station along that cylinder I would recommend;
Measure the straight as a cylinder
Program in a Generic Feature - Plane with the XYZ, and IJK of the nominal circle.
Intersect the cyliinder and the generic plane to get the circle.
Evaluate that for true position as needed.
Cancel
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