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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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