Posted by Paul from MI on October 21, 2009 at 19:55:56 from (204.106.244.65):
In Reply to: Fixing Spring End posted by Brian-Ont on October 21, 2009 at 07:12:08:
DON"T attempt to reharden or retemper the end of the spring, unless you have a lot of experience in metalurgy. You will most likely end up with a hardened, untempered section of wire that will break easily. Most oil tempered spring wires are hardened and tempered to approx. Rockwell c 45-48. Unless you can carefully control both hardening and tempering temperatures, and have a means of controlling the surrounding atmosphere to prevent decarburization you are wasting your time anyway. I assume that you are speaking of a 3/8 diameter wire spring, so it won't bend easily to form a new hook. You may have some success by heating the area to be bent to form a new hook to a very dull red, bend it to shape while hot, then letting it air cool. The spring likely broke in the first place because it was highly stressed or had a rust pit that created a stress riser. Either way it may break again fairly soon. If it was mine and it broke on Sunday afternoon I'd give it a try to get going again. Replacement is the best alternative. I know this is kind of long, but I spent 45 years designing and making springs and spring machinery so I've had a little experience. Good luck with it. Paul
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