Motor, Chain, And Crank Shaft

November 13th, 2015

Motor, Chain, and Crank Shaft

The video shows the motor turning the chain and the crank shaft. Some of the parts in the video are not quite finished but I really wanted to see if it all worked together ok. Actually, when I put it together like this, the chain had too much slack in it and I had to elongate the motor mounting holes to make it adjustable.

I am taking a break from this work to slow down my band saw. I have an old Bodine motor with a gearbox on it and with a 6:1 reduction, the band saw should run at just the right speed for cutting steel. I can cut steel now but I go through blades pretty quick, and at $22 per blade, it’s not a cheap way to do things. Slower will be better. My dad is making me a shaft extender that also enlarges the motor output shaft to the 13mm needed for the Ryobi drive belt pulley. I need the size change as well as the longer shaft, so a part that simply slides onto the existing motor shaft was the cheapest and most useful choice.

I plan on making another crank shaft. This one got a little bent up during the brazing process and cleaning the brass off the connecting rod journal left them a little rough and not quite round. At the speeds this will go, it would work for a long time before wearing into bearing, but it’s still not as good as I would like.

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