Kreis auf Kegel

[[An...]]

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[[Da...]]

Wow ! Andeas, I use cones and circle on a cone a lot. I can't translate the pictures you have posted, can you type the information contained in the pictures, maybe I can help.

[[An...]]

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[[Da...]]

OK, the translator is very awkward, but I was able to use it successfully.

We talked about this a long time ago. There is a probing difference between a "roundness tester" and a CMM (XT). The cmm cannot check the roundness the same way. Runout of the Circle on a cone feature will produce even more roundness error on the cmm. We have 7 or 8 roundness testers here. I have developed processes to try to get roundness and runout on the cmm to some limited results. I check the cone as a cone first then make an alignment to the cone (including Rotation in space, X and Y) then run the circle on a cone to the new alignment. The errors are greatly minimized, but not eliminated. In addition, the error increases with the steepness of the angle! Here is some supporting literature.

https://www.researchgate.net/publicatio ... al_Surface

[[An...]]

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[[Da...]]

there is another thing that happens when the points are above and below the mid plane. As you move up the cone, the radius of the cone changes. (it gets smaller), when the points move below the mid plane the radius gets larger... so there is additional roundness error even if it was recording correctly. Runout of the circle on a cone will cause this condition.