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To develop machining skills with appropriate selection of tools. rest is swiveled to the angle “?” in degrees (as per the calculation) with the help of.The machining time, TC required for a particular operation can be determined. Version 2 ME, IIT Kharagpur. Page 4. ? roughly by calculation i.e., estimation ? Estimation of Machine Shop. 6th Unit. 6 Unit. Prepared by: Amit Hooda. Page 2. Machining Cost. • It is calculated after finding Machining time includes:. Step 3: Calculation of machining time by using the formula (. ) 2. What are the typical data required for cutting time calculation in shaping (AU.