Posted by Tom Fleming on October 27, 2009 at 18:11:43 from (206.193.247.91):
In Reply to: hand crank pin? posted by Mike CA on October 24, 2009 at 02:30:55:
Just a couple of quick comments here. First off, I won't debate that cold roll won't take hardening like a higher carbon steel will, but it can be hardened to a point, and it definately can be case hardened (which is what I outlined). You can even get a better case harden by using charcoal, but that takes a bit more time. Cold roll will definately not take a temper either, so no debate there. There are a couple of ways to make cold roll harder than it comes from the store, but I do agree that it is nothing like high carbon steel.
So, I have agreed on a couple of points. Case hardening will prevent wear to the pin, and I have a couple of 'crank" start repairs to prove it......ain't no battery on my F-20.
Was trying to help Mike out with what I believed would be representative of the original pin. Roll pins will absolutely work, but for his H, they won't look original. I suggested steel rod stock that is readily available. Also, cold roll is easy to work with common tools like a hack saw, and a bench grinder.
Sounds like I am being a bit defensive, and maybe I am a bit, but I don't disagree that high carbon or tool steel will definately harden to a greater extent, and yes Virginia, cold roll steel cant be tempered. so I guess my bottom line is that Mike has not received any "bum" info here, just some that is easier to implement than others........
ps. do a search on "hardening mild steel" on the net...........
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