Posted by Bob Kerr on February 17, 2009 at 09:11:09 from (216.249.67.127):
In Reply to: Flat belt posted by Devin Sparks on February 16, 2009 at 20:00:38:
Twist in a belt is used for two reasons, one is the rotation of the drive pulley has to match that of the driven machine and the second only applies to the old steamers which were parked as far away from the thresher as possible for fire reasons. Since the belt was so long, the old timers said the twist helped keep the wind from running the belt off the pulley. Plus the steam engine can run the drive pulley in either direction. I have heard in the past that twisted belts prevent slippage because the belt is wrapped around the pulley more, But I also heard it didn't matter as the belt has the most weighted contact at the furthest distance of the two pulleys and that is where most of the pulley to belt friction is. Some old timers if they needed a "traction agent" would use sorghum or molassas on the belt to make it sticky, but if you are grinding corn, that will just make a big mess! One thing is BE CAREFUL!!! My Grandpa got his overalls yanked off by a thresher belt when he was young. He was lucky he didn't get wrapped up in it, It just took off his clothes in a split second and left him standing there bruised up. He said they got caught in the belt lacing and he thought static charge may have pulled them into it. I ran a few things with my 10-20 IH, a sawmill, a 28" JD thresher, and a buzz saw. Make sure the pulleys on both machines are lined up straight or the belt will walk off one of the pulleys. It can mess up a good belt if it gets between the machine and the pulley and be a mess to get it back out of there. When you start the machine, be sure everyone is clear and start it very slowly and gradually build up speed to the RPM the machine needs to work right. When shutting down, slow it down gradually as well and when you get to idle speed hit the clutch and let it coast to a stop. Be careful and you will have fun doing it!
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