## 3 March 2021

### Difference Between Cutting Speed and Cutting Velocity

Both cutting and speed velocity are interrelated and one is proportional to another. One can easily be converted to another, provided that the diameter of either cutter or workpiece is known. The following difference between cutting speed and cutting velocity to better understand this topic.

What is Cutting Speed?

Cutting speed is the rotational speed of either workpiece or there is some cutting tool. It is measured by the unit revolution per minute and designed by N. For example, cutting speed turning is 295rpm.

What is cutting Velocity?

Cutting Velocity is the tangential velocity of either the rotating workpiece or the rotating cutting tool. It is measured by the unit meter per minute and designed by velocity. Any rotating object or some part has a tangential velocity at any point on its body except the axis of rotation.

## Difference between cutting speed and cutting velocity:

• Cutting speed indicates the rotational speed of either workpiece or cutting tool, while the cutting velocity indicates the tangential velocity of either the rotating workpiece or rotating cutting tool.
• Cutting speed is commonly expressed in revolution per minute, while the cutting velocity is commonly expressed in meters per minute.
• Cutting speed is a scalar quantity, while the cutting velocity is one vector quantity.
• Cutting speed is usually not considered as a machining process parameter, while the cutting velocity is considered as one crucial machining process parameter.
• Cutting speed is only associated with that machining operation where either workpiece or cutting tool rotates, while the cutting velocity is associated with all conventional machining operations irrespective of presence or absence of rotation of workpiece or cutting tool.
• Cutting speed is mainly useful when operating machines, while cutting velocity is useful in a number of analyses, including the measurement of cutting power, temperature, vibrations, and machining economy, among others.