it will happen sooner than you think towards the edge. If you go with the Dremel, just use short bursts followed by a water dunk to keep it cool.
Just make sure you feel the blade, if it too hot to touch-it is too hot.
Too late.so I can touch test between bursts.
It will heat to the point of being able to raise a blister within seconds, and cool just as quickly, so you may overheat it and not know it.
You really need to have a finger very, very close to where the grinding is being done, right on the thinnest part of the edge.