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Concentricity of threads to -A-

FAMOUSX1
Hello All,
I am looking for some opinions on how to measure this callout.

I was thinking of scanning the thread with the appropriate pitch set in auto cylinder...

or

Maybe creating lines on the angles of the threads then creating a circle tangent to the 2 lines. Repeat this many times then create a circle or cylinder out of all those circles to create the PD. (If Possible)

I haven't tried this but it was just me thinking over the weekend of how I will go about this.
I'm not even sure I can create a circle or cylinder out of a bunch or circles radially.

TIA

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  • The callout is not asking for the concentricity of the major diameter. Its asking for the P.D., every idea Ive read so far only will accomplish measuring the major. This to me looks like a plate check (even though you cant legally measure concentricity on the plate). You would put the thread gage on the part which should have a ground dia on it, locate on -A- and get a TIR from the ground dia on the gage. OR you could probe the ground dia on the thread gage....
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  • The callout is not asking for the concentricity of the major diameter. Its asking for the P.D., every idea Ive read so far only will accomplish measuring the major. This to me looks like a plate check (even though you cant legally measure concentricity on the plate). You would put the thread gage on the part which should have a ground dia on it, locate on -A- and get a TIR from the ground dia on the gage. OR you could probe the ground dia on the thread gage....
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