Basically, I'm trying to cut through the detachable service panel on my Dragon and I've only made an 8 inch incision on the bottom, and I went through 3 dremel grinding bits. These are the small ...

Sharpening Your Specialty Drill Bit To sharpen the step bit, you can use a cone-shaped grinding bit with a Dremel. You should work on the smaller of the two faces inside the notch of the step bit.