[Jack21]

No, not a Dremel grinder. A die grinder uses 1/4" shank bits or burrs. Some call it a rotary file instead of a die grinder. You could call it a big brother to a Dremel. The Dremel uses tiny 1/8" bits, and is not suited for what you're looking to do.

For clarification, the carbide bits referred to are used on ferrous metals. Cast iron, and the piece of steel you're trying to remove. The bits came from a company called Severance Tool Co, in Huntington, NY. Right in your back yard. Still have a copy of their '72 catalog.

The tool steel non-ferrous bits are used on aluminum and brass. For production work, head porting, would use carbide with non-ferrous flute pattern.

Personal preference is to adjust tool speed to the job, and most jobs require less than full tool RPM. Some head porting bits have long shanks to reach into the port, and will whip at full tool speed.

My Craftsman die grinder performed well for nearly 30 years, but Sears has long since stopped making them. It need a front shaft, and bearings, and couldn't get them. That's why I replaced it with a DeWalt.