Wednesday, November 16, 2011

Steam powered hoist (Jensen 75)

Quite an amazing feat for an engine with only 1/10th of a horsepower. With the help of the line shaft and an antique knife sharpener, I was able to obtain a 112:1 gear ratio. That means the flywheel of the steam engine turns 112 times while the drum attached to the knife sharpener turns one revolution.The "drum is made out of a screw in plug for an oxygen sensor port on a Harley exhaust. It had an allen socket that I put in a mill and milled out a nice flat surface for the screw to seat on. I then drilled a hole through it for the screw. It worked out nice, because it already had threads on it, that the string could get some grip on. The knife sharpener was bought at a flea market, at ,of all places, a steam engine and antique tractor show. My lovely wife picked it up figuring I could use it somehow, with my Jensen. It was missing half of the sharpening wheel, and was froze up solid. Some penetrating oil, a coat of paint, and a few modifications later I made it into a hoist. It is a very interesting piece, a handle attached to the same spot as the "drum" is now. You turned the handle and it spun two stones to sharpen knives etc. The gear ratio woked the opposite way that I am using it now. Perhaps in the future, I will utilize it using the gear ratio the other way around. The Jensen 75 lifted this weight very easily. As the "drum" is only held on by a 6-32 screw, I thought perhaps that would be a weak point, as well as the nylon kite string, but it all held! Thank you for ...

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