|Forum topic by luthierwnc||posted 07-09-2016 12:39 AM||258 views||0 times favorited||1 reply|
07-09-2016 12:39 AM
I’m lining-up a project to make a cranked-neck chisel. In my mind’s eye, it will look a bit like the old Buck versions but with the handle more parallel to the blade. I’ve already got a firmer chisel made from an old file for rough work so this one will have beveled sides and more tip angle for finer work.
I’m going to use 5/32” virgin O1 steel 3/4” wide. I’m not sure if you can tell it from the crude drawing but I’ll grind about a 4 1/2” section with a mild taper. Then I’ll heat and thicken the tang section by pounding about 1/8” of steel into itself for rigidity. In the same session I’ll bend the “S” curve. For lack of a better idea, I thought I’d make a steel doughnut with a square hole as the stop. I’ll pound that into place and braze it tight.
My question is on heat treating. I can’t decide whether I should harden and temper the “S” curve area or just let it cool soft. If I do temper it, it will be softer than I’ll do the edge area. The advantage of letting it anneal is a) I’m lazy and b) if it bends, I can temper it then.
How would you guys do it? Thanks, sh