CAD compare and position tolerance

kruther · Jun 22, 2023

Hello, I'm a very new to QCing person using a CMM device.
We have parts for a client that mostly just wants us to do CAD compare. I'm also very new to GD&T in general, so it's been a fun few weeks.
How do I apply position tolerance to holes like this using CAD compare? Can I?

https://files.engineering.com/getfi...042-f4ded69a8ec3&file=IMG_20230622_112705.jpg

3DDave · Jun 22, 2023

For that callout, at the true position (nominal location of the axis) there is a cylindrical volume the diameter of smallest size of the hole (the sketch doesn't provide that number) that the actual hole boundary cannot cross and be acceptable. The other requirement is that the hole not be any larger than the largest size (the sketch does not provide that number.)

kruther · Jun 23, 2023

So it's just cad compare with surface profile tolerance of the hole diameter. thanks

3DDave · Jun 23, 2023

I doubt profile tolerance will accept all the same parts. Profile of surface will likely reject parts that have acceptable position tolerance.

Belanger · Jun 23, 2023

To follow on 3DDave's comment... surface profile would control not only position/location, but also the form and size of the hole. So it's not the same thing.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

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CAD compare and position tolerance

kruther

Mechanical

3DDave

Aerospace

kruther

Mechanical

3DDave

Aerospace

Belanger

Automotive

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