Old stone grinding wheel Safety Grinders, Sanders, etc ...
Oct 17, 2009· An increase of an inch in diameter has big changes on centrifugial forces! If a grinding stone has no ''safe rpm'' label best to use it by hand only. Every time my maintenance fitter mate sees me buy an old wheel (originally for a bench grinder) he shakes his head, even when i stress i''m using it to hand rub scale off when tempering.