Manufacturing And Production Technology
Tool life is measured by the

Time the tool is in contact with the job
All of the listed here
Number of pieces machined between tool sharpenings
Volume of material removed between tool sharpenings

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

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

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