Manufacturing And Production Technology
A better machinable metal is one which gives

Higher chip-tool contact area and smaller shear angle
Lower chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle
Lower chip-tool contact area and larger shear angle

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Manufacturing And Production Technology
Jigs are used

None of these
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

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