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2-True Position Tolerance Zones- Tolerance Zone Inspection

We'll now use a plug gage to inspect the machined part from the previous page.

Assume that the plug gage will register off of the left face and bottom face of the part so as to gage to the surfaces called out in the print. It must be assumed that that the center of the gage pin is exactly 1.000 inch from the left and 1.000 from the bottom (go back and review the blueprint if you need to). Also the diameter of the gage pin will be exactly .020 smaller than the hole (.230) so that it can compensate for the tolerance zone.(blue)

The use of a gage plug works well for demonstrating screw and dowel clearances in later topics. But for now just remember that if the machined part fits over the gage without interference from the sides of the hole then it tells us that the center of the hole is within the tolerance zone.

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