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Re: Re: Re: Farmall H Steel Belt Pulley? Is there such a thing?
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Posted by Andy Martin on May 24, 2001 at 16:59:26 from (38.31.74.240):
In Reply to: Re: Re: Farmall H Steel Belt Pulley? Is there such a thing? posted by Scott S. on May 24, 2001 at 11:33:49:
The belt stays on the pulley because it is crowned in the center. Tension on a flat belt makes it want to run "uphill", so a crown (a slight rise) in the center helps keep the belt on. Of course you have to align the tractor and implement well to make sure the pulley shafts are parallel. Tension on flat power belts is usually accomplished by using the sag in a long belt (30 is short) so the pulleys are 15 feet or more apart. With a long belt, tension can easily be applied by backing the tractor until a reasonable sag is obtained. The tractor position can move an inch or so without affecting the tension greatly. With a short belt, like would be used on an old lathe or drill press, a tenth of an inch makes a lot of difference in tension. It is too hard to adjust and hold a tractor to those tolerances. Belt driven hammermills are available reasonably priced, and are an ideal setup to run from a tractor. Even if you don't have feed to grind, you can grind leaves to make mulch, or just spin the mill. They run empty OK. It is a blast to set up and run an implement off your belt pulley. Flat belting is still sold for use in round balers and is readily available in any length. You can give the belt a half twist to make the implement run the opposite direction. You need a long belt, maybe 60 ft for this. By the way, the flat pulley is a true pulley. A v-belt runs on a sheave, not a pulley. A sheave is a pulley with a v-groove for a v-belt. I'm done, I know you didn't ask.
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