How to determine cutting speed

 (line speed, circumferential speed) V (meters/minute)

To select the spindle revolutions per minute, it is necessary to first know how much cutting line speed V should be taken. The choice of V depends on the tool material, workpiece material, processing conditions, etc.

Tool material:

Hard alloy, V can achieve a high value, generally above 100 meters per minute, and technical parameters are usually provided when purchasing blades:

How many line speeds can be selected when processing what materials. High speed steel: V can only be obtained at a relatively low level, generally not exceeding 70 meters per minute, and in most cases below 20-30 meters per minute.

Workpiece material:

High hardness, low V value; Cast iron, with a low V value, can be used for cutting tools made of hard alloy at a speed of 70-80 meters per minute; Low carbon steel can have a V value of over 100 meters per minute, while non-ferrous metals can have a higher V value (100-200 meters per minute). Quenched steel and stainless steel should have a lower V value.

Processing conditions:

Rough machining, take a lower V value; Precision machining, with a higher V value. The rigidity system of machine tools, workpieces, and cutting tools is poor, and V is taken as low. If the CNC program uses S as the spindle speed per minute, then S (spindle speed per minute) should be calculated based on the workpiece diameter and cutting line speed V, where S=V (cutting line speed) * 1000/(3.1416 * workpiece diameter). If the CNC program uses a constant line speed, S can directly use the cutting line speed V (meters/minute)