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Heat Treating

1008 Views 9 Replies 6 Participants Last post by  jbranson, 
J
Just heat treated my first piece of metal. It's a mandrel for expanding exhaust pipe for slip fits. Worked before but it was hard to push in and pull out because the pipe would grab hold of it pretty good, and it was starting to show some signs of wear.
Heat treated that baby and now a file slides on it like it's made of glass. It's 1" thick so I don't have to worry about it cracking...and it's not under any bending loads anyway.
Tried it on another mandrel...didn't work...then I noticed I didn't make the other mandrel out of "hardening" steel like the first one.

Just had to tell someone.
JohnnyB
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C
quote:
I'm trying to come up with race bike uses...but for the most part it's for making tooling to make race bike parts. Would work for valves spring base washers, gears (after tempering), any part that could stand to be a bit brittle and was susceptable to wear. Valve stem ends for instance....just the very end though.
JohnnyB
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JB,
I'm going to harden my rear axle spacers. They don't have much area where they contact the bearing race so wouldn't be prone to squashing down. I make the end that bears against the SA very large because it only contacts above and below the axle slot. I think it will make the SA a little stiffer.

FC
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