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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DAN_M over 7 years ago in reply to DAN_M

SO incredibly sorry, I had multiple browsers open and had a few different numbers flying around in my head as I typed this out. 1/20 = 0.05

That is the value you want to use.

The "20" in 1/2-20 means that there are 20 complete thread revolutions over a 1 inch distance. So your thread pitch you want to use for your autofeature is 0.05".

Again very sorry, going to go poor another cup of coffee now =P
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DAN_M over 7 years ago in reply to DAN_M

SO incredibly sorry, I had multiple browsers open and had a few different numbers flying around in my head as I typed this out. 1/20 = 0.05

That is the value you want to use.

The "20" in 1/2-20 means that there are 20 complete thread revolutions over a 1 inch distance. So your thread pitch you want to use for your autofeature is 0.05".

Again very sorry, going to go poor another cup of coffee now =P
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