Manufacturing And Production Technology
The chamfering is an operation of

Beveling the extreme end of a workpiece
Enlarging the end of a hole cylindrically
Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface

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Manufacturing And Production Technology
Fixtures are used

To check the accuracy of workpiece
For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
None of these

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