The cutting speed of the lathe reaches 360 m / min. Determine the diameter of the part if the machine is running at 191 rpm.

Task data: V (cutting speed of this lathe) = 360 m / min; N (number of revolutions of the machine spindle) = 191 rpm.

1) Based on the initial data, it can be seen that in 191 spindle revolutions, the cutter can make a plunge into a part of 360 m.

2) Work piece circumference: L = 360/191 = 1.885 m.

3) Part diameter: D = L / Π = 1.885 / 3.14 = 0.6 m.

Answer: The diameter of the part before processing was 0.6 m (60 cm).