a. If rough milling of mild steel is performed using High Speed Steel (HSS) side and face milling cutter of 100 mm diameter, what rpm should be used. b. If finish turning of a shaft is done to reduce its diameter from 24 mm to 20 mm using carbide tool, what rpm should be used. Metric Surface Speeds in m/min (Cutting Speed) Milling - Finish HSS 75 - 105 60 - 90 25 - 30 23 - 40 12 - 25 Turning Drilling Carbide 90 - 115 75 - 100 Milling - Rough HSS Carbide Carbide Rough Carbide Finish 150 - 270 135 - 260 Tool Material HSS 55 - 60 40 - 45 12 - 18 10 - 15 8 - 18 Aluminum Brass 135 - 180 60 - 75 Carbide 120 - 240 90 - 210 60 - 90 120 - 240 45 - 60 105 - 210 Cast Iron 35 - 45 15 - 25 55 - 75 60 - 90 60 - 90 75 - 135 18 -3- 10 - 15 75 - 105 60 - 100 Mild Steel 18 - 27 25 - 37 75 - 105 45 - 60 55 - 67 100 - 145 Stainless Steel 75 - 120 85 - 150

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Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.