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Dedicated fixtures are designed to meet the needs of a particular production part. They can be made quite accurately and their only limitation in accuracy is the production variation inherent in the part itself. It is not uncommon for fixtures to be made with 0.001" accuracy.
A variety of techniques can be employed with dedicated fixtures: they can be molded to fit the production part, they can employ vacuum at various points, they can include clamp bars (De-Staco and other systems, beds of pins can be arrayed to conform to the bottom of a part, etc.
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