As indicated above the unit for cutting speed is meters per minute(m/min). Therefore in case if the  diameter of the part or tool is measured in mm the formula for the cutting speed will be as below

In a turning operation during metal removal, for each rotation of the spindle the material along the circumference is removed. This can be denoted as πD.

Well i hope you would have got some insights about what Cutting Speed is and how about calculating the cutting speed for and efficient machining process. Kindly let us know your comments in the comment box below. Also if you have any questions feel free to write to us.

Cutting speed = πD for one complete rotation. Similarly for two rotations it is going to be 2πD and so on. Therefore for “n” number of rotations Cutting Speed can be denoted as πDN. Where π is a constant, D stands for Diameter of the part / Tool, N stands for number of revolutions in rpm.

Cutting speed is defined as the rate at which the material is removed from the workpiece during machining. In simple terms cutting speed is the metal removal rate. The unit of cutting speed is meters per minute (m/min).

Find the rpm to turn a cylinder of 20 mm diameter with a cutting speed of 120 m/min. Diameter of job (d) = 20 mm Cutting speed (CS) = 120 m/min