### critical speed of a mill

critical speed of a mill what is critical speed of a ball mill - May 01, 2007The revolution per minute of a ball mill having an internal diameter of 1200mm should be 27. This is 70% of critical speed of this diameter. Critiacal speed of a ball mill is that rpm at which the balls inside will stick.

### speeds for milling? | The Hobby-Machinist

May 09, 2011· There are many variables involved in determining the optimum spindle speed and feed rate. Much depends on the machine and workholding method. Cutter geometry, material, flute count if end mill are only part of the equation.