Alignment Help

[[Da...]]

I have been asked to make a program for the attached part. It is very small (OD is .486 inch)

The only way I could think to fixture it is by mounting it with a screw onto a milled down scrap part. (see photo)

But now I am struggling with how to align it for the following reasons:

No flat spot on part to use as a Z zero

I have never tried using a torus as the X and Y zero. Is this even allowed, and if so, are there any special considerations when doing this?

I don't know what kind of strategy to use on a torus. Just a bunch of random points?

I considered using the shoulder of the fixture as the Z zero and the cylinder on the fixture below the part as the  and Y Zero. I believe I would then have to make a secondary alignment using features of the actual part in order to get the angle of the indent features, but that takes me back to the original problem. 

I was going to clock it to the dimple, but it is very small and I don't know how to probe it. Is there a better way to clock it? If I did want to clock the dimple, how would I do that when the probe hardly fits inside? Is there a way to have the probe find the center of the dimple like it does when you are setting the probe rack location?

 

Contura with XXT. I only have base Calypso. No curve or freeform. 

[[DW...]]

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 What are you trying to measure? What are the tolerances for those characteristics? I would argue the CMM is not the best way to inspect this piece. 

[[RP...]]

What probes do you have available?

I'd use a 1.0mm star probe to extract all the features.  clocked with the dimple.  add in circle scans and recall into lines for the funky angled mill areas.  secondary alignments for each of them.  or space points all around and calculate deviations.

[[Da...]]

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The angles radii both directions on the slanted indents, as well as the angles of the slanted indents to the top of the part. 

I agree the CMM might not work out well, but I was asked to try.