**SPINDLE SPEED [N] :**

**Spindle speed plays a very important role in calculating cutting speed. Spindle speed is also called RPM. This means how much revolution the spindle does in a minute is called RPM or spindle speed.**

Suppose 2000
spindle speed. If you want to show spindle speed in a CNC program, it should be called

**S2000**.**CUTTING SPEED:**

**It is the speed at which material remove in one minute by cutting tool from a linear distance of workpiece. It is express as**

**mm/min**or

**m/min.**

**Formula ;**

**Cutting speed (Vc)= (Ï€ D1 N)/1000**

**mm/min**

Where D1 = Uncut diameter of the workpiece

N = Spindle speed

Sometimes tool have cutting speed limitation
. Consider limitation of tool for
cutting speed Vc 200 to 250 and diameter D is 50. That time we need to calculate spindle speed

Let’s see the calculation ;

**200 =**

**(3.14 ×50×N)/1000**

**N = 1274 RPM**

**FEED:**It is simply defined as a movement of cutting tool each cut . It is express as mm/rev.

**DEPTH OF CUT :**

**Thickness of metal removed in each cut of the tool . It is a perpendicular distance measure from the machined surface to the uncut surface of a workpiece .**

Depth of cut calculation while performing
turning

**d =****(D1-D2)/2**
What is cutting speed , feed and depth of cut ?
Reviewed by www.hdknowledge.om
on
September 13, 2020
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