72404089 Theory of Metal Cutting Solved Problems

A Textbook of Production Enginwring

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= 1%min.

Example 2. For a metal m a c h i n i ~ ; ~ & e f i winformation in is available : Tool change time, = 8 min -I ' 1i1iri { V i ~ a ! ,iI < , .IT, . - * i t !tv,tv ~ o ore-grid i timea=3 nr'in' Machine running cost, = @ 5 per hour Tool depreciation per re-grind, = 30 p Ra * : ~ r f i ~

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a!. r,- ,,. , , I ' . . ,. ., Calculating the optimum cutting speed Solution. Tooling cost C, = Tool,changecost + tool regrind cost + tool depreciation , ' 3 ~ .J 5. 5 t '

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Example 3. In an orthogonal Wthg operatiout, t kfol&?wjn~$$$h~e been gbewed : Uncut chip thgkness, . t = 0.127 mm .--. ikji:~,~ I :,.. . Mdthofcut,. .