Ordinary 8000 rpm motor and high speed motor are better? Is there any difference?

High speed and low speed are not good or bad, this is just a technical issue. The high-speed motor is used to grind the inner circle, because the grinding wheel generally equipped with the grinding wheel is relatively small, so high speed is required; and the ordinary 8000 rpm motor with the standard specification grinding wheel is completely acceptable in the general edging chamfer.