Why does the Dremel 4000 have high speeds?
The Dremel 4000 rotary tool has high speeds of 5,000 – 35,000 rpm. High speed, when coupled with the right accessory, is what makes the rotary tool so useful. The best results generally happen when taking a less aggressive, more frequent pass. Too much pressure on the spinning accessory and the work piece can damage the accessory and the work piece. If the accessory is not producing the desired result, we would recommend adjusting the speed, or trying an alternative accessory.