Jspool Posted February 16, 2016 Share Posted February 16, 2016 I am about to make a set of spring fullering tools for my power hammer. I see that most folks are using mild steel for the flatbar portion. Before I start, is there a better option to go with if I want the spring to last longer? My hammer is a 55lb Kinyon. I was going to use 1.25" x .125" flat bar for a fuller set ranging from a 3" slightly rounded down to a 1/2" half round Quote Link to comment Share on other sites More sharing options...
petere76 Posted February 16, 2016 Share Posted February 16, 2016 Mild steel works fine because you are working hot iron. Closed spring dies, like harder steel or at least some case hardening. I noticed the closed dies for forming ball ends seem to wear out the fastest. I'm using these tools on a 50 lb tire hammer. Peter Quote Link to comment Share on other sites More sharing options...
Jspool Posted February 16, 2016 Author Share Posted February 16, 2016 Thanks, but I was referring to the spring part of the tool, not the swage or fullering portion. Will mild steel loose its "spring"? Quote Link to comment Share on other sites More sharing options...
SmoothBore Posted February 16, 2016 Share Posted February 16, 2016 Well, it's not really a "spring". What you're actually relying on, is the "memory" that's present in all steel. Mild steel works well in this application, because it's less likely to harden or fatigue from repeated flexing, and should it deform over time, it's easily reshaped. . Quote Link to comment Share on other sites More sharing options...
EricJergensen Posted February 16, 2016 Share Posted February 16, 2016 No. You really only lose spring when you push something past the yield point. You're not pushing the spring very far. And, if you're welding a die piece on the end of that, the weld is likely the first thing to go. Edit: not because of the steel used for the spring, but just because of the heat affected zone of the weld, etc. Preheat and normalize to reduce that. Quote Link to comment Share on other sites More sharing options...
Jspool Posted February 16, 2016 Author Share Posted February 16, 2016 Great. Thanks guys. Quote Link to comment Share on other sites More sharing options...
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