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SSC JE Mechanical Engineering 2018 Set 1 Paper

Question : 156 of 200

Marks: +1, -0

The tool life of a tool is said to be over if

the tool has failed and a poor surface finish is obtained
sudden increase in power and cutting forces takes place and chatter appears in machining
overheating and fuming due to friction occurs in addition to dimensional instability
All option are correct

Solution:

Tool life is said to be over if-

(i) The tool has failed and a poor surface finish is obtained.

(ii) Sudden increase of power and cutting forces, increase of chatter

(iii)Overheating and fuming due to friction and dimensional inaccuracy

Tool life

V \cdot T^n \cdot f^n \cdot d^n = C

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