True Position Tolerance Zones
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
1- Square Tolerance Zones a look at the old way

2- Tolerance Zone Inspection inspecting a hole with a center square tolerance zone

3-The Problem with Square Tolerance Zones making the tolerance zone round

4-Inventing a New Blueprint Note circa WWII

label: true position, geometric tolerancing, ansi y14.5, tolernce zones