Concentricity of threads to -A-

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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DAN_M over 7 years ago

Whenever I am measuring a thread, I like to use a basic auto cylinder with the appropriate thread pitch. Usually works out well.
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acgarcia over 7 years ago in reply to DAN_M

How do you determine what the thread pitch is going to be for the auto cylinder? The help file says the pitch is also know as "threads per inch". So if I have threaded holes with 1/2-20 UN-2B threads, my pitch value on the auto cylinder dialog would be 20?
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acgarcia over 7 years ago in reply to DAN_M

How do you determine what the thread pitch is going to be for the auto cylinder? The help file says the pitch is also know as "threads per inch". So if I have threaded holes with 1/2-20 UN-2B threads, my pitch value on the auto cylinder dialog would be 20?
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