There was a knife maker on this forum that was really concerned about the safety of buffing his blades and he used wood screws to hold the blades on a piece of 2x3 wood and buffed the blade mounted to the wood block one side at a time. I don't do that but I wear a leather apron and move my feet from directly under the buffer. I run a 3450 RPM buffer but use 6 inch or smaller buffing wheel. Having a firm grip and not pushing too hard is very helpful. I use an angle grinder also and wear a leather apron, face shield, and earplugs. It's not much trouble to avoid serious injury if you respect the machines and take a couple precautions in my opinion. Larry