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Datums

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The datum system is a method of establishing part features to be used for measurement. 

If we are going to measure something, we must establish where to measure from and how to hold the part when we measure it.

To understand the datum system, we must first understand Degrees of Freedom.  Then we can understand Planar Datums, Feature of Size Datums, and Datum Targets.

Picture
Degrees of Freedom

Planar Datums

Feature of Size Datums

Datum Targets







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