The cutting speed is equal to (Where D = Diameter of job in mm, N = Spindle or job speed in rpm)

1
\(\frac{{\pi DN}}{{1000}}\)
2
\(\frac{{2\pi DN}}{{1000}}\)
3
\(\frac{{\pi DN}}{{75}}\)
4
\(\frac{{\pi DN}}{{4500}}\)

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