Manufacturing And Production Technology
In determining the various forces on the chip, Merchant assumed that the

Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
Only continuous chip without built-up-edge is produced
All of these
Cutting velocity remains constant

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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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