To control the height of the cutting tool, in this case a Dremel ... It is mounted in the same orientation as the Dremel bit and is constrained such that it and the Dremel move in the same ...
Power rotary tools like Dremel's classic version do ... you start to see the rotary tool's usefulness as a general cutting tool. Dremel makes a good one ($14.99 at Menard's), and we've also ...