Excuse the slight thread hijack but this seems a good place to ask a question on the subject of cones.
Does anybody know if cones are hardened through or just case hardened?
I have found a method of regrinding the bearing surfaces of rough cones at work but if they're only case hardened I don't suppose they're going to last for too long.
Here's some I've had floating around in my work bag since doing them for a practice a couple of weeks ago. Excuse the bad photo, this was actually the best of seven that I took, couldn't persuade the camera to focus....
I would hazard a guess at them just being case hardened - pure guesswork though. If that's the case you could try re-hardening the bearing surface again ? Get it orange - red hot, then quench in oil. Then heat it again more gently until it goes bluey colour, then let it cool naturally.
DON'T come crying to me when your wheels lock up when the cones turn to cheese though
Being slightly more serious though - if you wanted to roughly test whether they're case hardened or fully done, then grind the bearing surface, cut one cone in half and grind a bit from the middle, then grind some known
tool steel. Compare (in your head) the colour of the sparks and you will have the answer
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