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Measuring the intersecting overlap of two cylinders

NullTie
Hello!

I have a quick question regarding how to measure an overlapping area of where two cylinders, one being at an angle, with a CMM.

(Just a quick pre-emptive note, What I am uploading I have personally made to reflect the concept of what I need to inspect but has absolutely no resemblance to the final part)



As you can see I have a tube-like structure with a small radial indent. In Zone C6 there is a dimensional call out of 0.060" I'm having trouble figuring out how to get that dimension with a CMM. I can do everything else easily except for that. I tried creating intersecting lines and circles but I can't seem to get it at the exact location the print wants.

I can check it easily with a sine bar and height gauge but I'm wondering if it's possible to check it with PCDMIS.

I've attached a larger copy of the print and a step file if someone can help me take a crack at it.

Thanks in advance!

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  • do a 3D distance between the two cylinders (changing the add rad / sub rad as needed) to get that 0.060 value, and I would 'think' that the axis of the indent cylinder would get the 0.300 value.

    That got me the 0.060"! Thanks! I never really use the 3D distance option because I don't really understand what it does. I wish there was some sort of visual representation to help with that.

    The 0.300 I got no problem. It was just the 0.060" that was giving me a hard time.

    Thanks again!
  • in reply to NullTie
    2D distance gives you the minimum value between 2 features based on the WORK PLANE you are currently in. 3D is 'free-floating', gives the smallest possible distance between any 2 features in 3D space.

    Think of the corners of a cube. You get the bottom-left corner measured and the top-right corner. 2D distance will be the 45 degree distance between the 2 (Z working plane), 2D distance using 'TO AXIS' will give you the different in that axis between them, while 3D will give you the value if you were to measure corner-to-corner using calipers.
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  • in reply to NullTie
    2D distance gives you the minimum value between 2 features based on the WORK PLANE you are currently in. 3D is 'free-floating', gives the smallest possible distance between any 2 features in 3D space.

    Think of the corners of a cube. You get the bottom-left corner measured and the top-right corner. 2D distance will be the 45 degree distance between the 2 (Z working plane), 2D distance using 'TO AXIS' will give you the different in that axis between them, while 3D will give you the value if you were to measure corner-to-corner using calipers.
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