The time required to finish a particular operation can be calculated, if the cutting speed and feed are known.
Machining time in minutes = length of cut(l) / feed per minute
here
feed/minute = feed per revolution (s) x rpm (n)
so the formula can be written as :
Machining time= l/s x n where
l = Length of cut in mm
s = feed per revolution in mm
n = rpm of work
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