grinding questions...

S

SkaerE

Joined
Sep 9, 2001
Messages
428
ok, i have a couple questions about grinding techniques/grinding different materials etc.

1.) do most of you grind blade up or blade down? and why?

2.) how much harder is it to grind the "super steels" like BG42 and others? (compared to O1)

3.) do you have to worry about getting metal too hot when grinding before you harden it? or is it just after heat treat that you need to worry about temp?

4.) how thin do you take the cutting edge before heat treat on the stainless and super steels? can they warp like the high carbon steels when hardened?

5.) who's the best to send a knife off to heat treat it? does it depend on the type of steel?

thanks!
 
1) always grind edge up. buff or scotchbrite belt, edge down. 2) bg-42, s30v, 154cm, dont seem to be much tougher than o1 to grind. the finish work is a bit more on s30v, 3) i never let the rough steel get to hot to hold, after heat treat, i dip after every pass. 4) i send all of my ss blades to mr. paul bos in el cajon ca, he has been heat treating ss blades for over twenty five years and lord knows how many10s of thousands of blades he's done. well i hope this awnsered your questions. happy grinding!
 
Edge up, just seems like it might be safer, and for me at least, seems to give a little bit better control, so better looking grinds.

I work until it's uncomfortably warm. might not matter, but better safe than sorry. I tend to try to wokr on a coupla pieces of steel at once so I can let one cool down while I work on other. Some of SUPER alloys, specifically thinking of cruwear, is supposed to work harden really easily, and become way too hard to grind. But the more standard alloys shouldn't have much trouble.

And those are only ones I have input on. :)
 
forgot one! i grind to beteew 1/32 and1/16 depending onthe type of blade. its always better to go a little thick. you will be taking off more arter HT.
 
I grind edge up. With all the good belts available now, the steels all seem about the same to me, except BG42, which both saws, and grinds like balsa wood, extremely easy.
You don't want to grind all on one side, then the other. Make a pass or two, dip it, and repeat on the other side. That will keep the stress down, and keep it from warping in heat treat. And speaking of that, no one is better than Paul Bos, he even straightens warpage. He does air hardening steels, like 440C, BG42, S30V, 154CM/ATS34, that sort, and I think A2.
 
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