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Measure a rubber band or O-ring

Meastec
My name is Lars Engstrup and from Denmark.

I have a task where I need to measure a diameter on a thin part made of rubber (like a rubber band or O-ring).

But when the part is made of rubber and deformed (not round) will calculation of the diameter not be possible by using the normal circle calculation program in PC-DMIS. But I need a method to calculate the circumference/length of the surface/contour on the diameter.

The diameter will be measured with optical scan at a Mycrona CMM.

What opportunities are there in PC-DMIS CAD + + (version 4.2) to calculating the circumference / length of the contour of a curve.
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  • I suppose you could do closed scan with a .002 increment (make you turn the touch speed waaaay down if it's a really light part, that way you don't deform it). After the scan has been completed, select "To Points" and then report the distance between each adjacent point. Add up all of those distances and that will give you cirumference. I suppose it depends on what your tolerance is, but, this will give you a fairly accurate way to calculate the circumference. And from there, just calculate the Ø
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  • I suppose you could do closed scan with a .002 increment (make you turn the touch speed waaaay down if it's a really light part, that way you don't deform it). After the scan has been completed, select "To Points" and then report the distance between each adjacent point. Add up all of those distances and that will give you cirumference. I suppose it depends on what your tolerance is, but, this will give you a fairly accurate way to calculate the circumference. And from there, just calculate the Ø
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