Posted by mattofvinings on October 25, 2009 at 02:54:10 from (198.208.159.20):
In Reply to: hand crank pin? posted by Mike CA on October 24, 2009 at 02:30:55:
IMHO here...but a roll-pin is probably best practice because the spring steel will conform to a hole slightly out of dimension. The spring tension will also "grip" the hole without having to carefully engineer an interference fit.
Relative to quenching and tempering cold rolled all my information and experience says you are simply wasting heating fuel doing that. You might come closer to hot-rolled but at no time will the yield strength improve without a surface treatment such as nitriding, carburizing (case-hardening) or going to a medium-carbon steel or tool-steel that will respond to heat treatment...but mild steels go red hot to supercooled with no change in the final state...just simply not enough carbon in the microstructure.
A dowel pin, while it may work is very very brittle, will likely snap if overloaded (generally hoping that doesn't happen in this application) and if broken off is generally a large pain because standard HSS drill bits won't touch it and solid carbide drills are generally a large waste of money in a hand-held drilling application.
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