Cameroon Baccalauréat Série F1 Practice Questions - Cameroon Baccalauréat Technique Série F1 (Fabrication Mécanique) Exam

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When locating a long cylindrical workpiece in a turning lathe fixture, which combination of standard locating elements provides a complete isostatic constraint?

A long cylindrical locating surface (centrage long eliminating 4 degrees of freedom) and a stop face (butée eliminating 1 translation), plus a rotational stop if orientation is required Three planar points on one end face and two line contacts on the perimeter A short centering pin (centrage court eliminating 2 translations) and two spherical locators Six independent spring-loaded pins distributed evenly along the cylindrical surface

Correct Answer:

A long cylindrical locating surface (centrage long eliminating 4 degrees of freedom) and a stop face (butée eliminating 1 translation), plus a rotational stop if orientation is required

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