Cutting speed is defined as the speed at the perimeter of the grinding wheel, measured in meters per second. The dynamic grinding hardness of a grinding tool can be influenced by changing the cutting speed. The higher the cutting speed, the higher the dynamic grinding hardness, which has a positive effect both on the life and the stability of shape of the grinding wheel. But the negative effect of this scenario is the deterioration of the "self-sharpening effect", with the wheel tending to clog up more readily.
Grinding wheels clogging up (an effect often found in practice) can therefore be counteracted by reducing the cutting speed, with the outcome that "self-sharpening" is enhanced and the grinding wheel becoming more cut-efficient.
The table below shows our recommended cutting speeds. As there are many different grinding processes and machines, the values shown should be regarded only as reference values:
Recommended cutting speeds
For cutting speeds in excess of 30 m/s, particular attention must be paid to cooling (see the chapter on "Cooling").
For internal grinding (with grinding pins), the above values should be reduced by 30% to 50%.
Equation for determining the cutting speed
Vs = cutting speed in m/s
D = Ø grinding wheel diameter in mm
Ns = rotary speed of the grinding wheel in rpm.
All of the DIAMETAL grinding wheels show the maximum permissible cutting speed:
Diamond: Vmax. 63 m/s
CBN: Vmax. 80 m/s