1898 Columbia Chainless Crank nut made


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Craig Allen

Finally riding a big boys bike
Jun 23, 2016
113
252
64
Millville NJ
#5
W-1 drill rod is a good steel for bearing parts and machines nice. Just heat it up to an orange color and dunk it in warm water. Put it back in the lathe and polish it up to a shine, and then heat it up again. But the second time you only want to heat it up until it just starts to turn a straw color and dunk it again in water. Don't put the point of the torch down on the work, let the bottom of the flame do the work. If you are not careful it will quickly turn from a straw color to blue in seconds in which case it is too hot. The second heating will anneal it and relieve some of the stress. It takes a little practice to get it right.
 

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