Find the correct number of strokes per minute to use on a shaper cutting a mild steel piece 250 mm long and 150 mm wide.

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Find the correct number of strokes per minute to use on a shaper cutting a mild steel piece 250 mm long and 150 mm wide. The cutting speed is 20 mpm for HSS tool. If a feed of 1 mm be used then how much time will be taken in machining one surface of job? What will be the machining time if carbide tool be used to cut at 100 mpm.

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