travisj said:Not sure what happened, but the Sorby's will roll the edge (like the previously mentioned Narex) when chopping mortises into pine. My dad blames his technique on the Worksharp for cooking the steel. I've been meaning to regrind them on the Tormek and see if they are salvageable.
Not sure about your Dad damaging the chisels by over heating them and taking the temper out. I think with chisels the final quarter inch or so of the chisel is hardened and tempered. So your Dad would have to grind 1/4 inch or so off the ends when he initially sharpened them. Or turn the 1/4 inch at the end of the chisel bright orange from heat to take the temper out. Did he stick the chisels in a forge and get them blowing hot? Or take a propane torch to the tips? Guessing your Sorby chisels did not really get a good tempering/hardening at the factory.