Rotational frequency

In Machining, the rotational frequency $n$ is a angular Velocity in turn by minute (tr/min).

It depends on the Cutting speed, of the diameter of the part/the tool…

$n = \ frac {v_c \ cdot 10^3} {\ pi \ cdot d_e}$
$n$ : rotational frequency out of turns/minute
$v_c$ : cutting speed in m/min
$\ pi$ : constant pi: 3.14159
$d_e$ : diameter of the workpiece in mm (turn) or diameter of the strawberry or the cutting tool (milling machine)

or, while following another notation:

$N = \ frac {1000 \, V_c} {\ pi \, D}$

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