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Old 05-26-2014, 12:28 PM
Mitchg95 Mitchg95 is offline
Motorized Bicycle Member
Join Date: May 2014
Location: Lakewood Colorado
Posts: 43
Default Re: Making a custom bike engine

I went ahead and naught a lathe yesterday, I did not have a lot so I got the harbor freight 7x10 metal lathe made by central machinery.
I am fairly happy with the results of the lathe so far, It seems to be able to hold a reasonable tolerance .
I started experimenting on some parts for the engine, so I started with the crank pins. I was just trying to determine my final pin diameter. 10mm is equal to .629" so I turned some aluminum to .630" and the bearing and rod slipped on for a nearly perfect fit. I might make the next actual pin at .631" or .632 to get a better fit. The first was made out of 6061-t6 aluminum just to determine the size I needed. So, as soon as I get some steel about .750 in diameter I'll make the actual pins.
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