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Tractor Talk Discussion Forum

repair of ci flat belt pulley

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rhudson

01-25-2004 11:25:42




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got a 4 foot dia flat belt pulley, s spoked, 4inch wide about 1/4 inch thick belt surface with center rib on inner surface. a section of the belt rim is broken and missing between the two spokes. is it possable/practable to bend a section hr or cr steel flat and brase it in place of the missing section? intended for output of an overshot waterwheel (about 20 rpm). Thanks for any opnions or tips.

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Fred OH

01-26-2004 19:11:34




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 Re: repair of ci flat belt pulley in reply to rhudson, 01-25-2004 11:25:42  
Rhudson...if this is going to be a classic looking piece of equipment when done, you might get with a small foundry somewhere and make a pattern out of hardwood and have them cast insert new...not hard to do...just have to remember that from molten metal to cold...it shrinks so you have to use a shrink rule to design new piece. Then a little grinding for fit up and preheat whole pulley and weld with castiron rod and torch. Can be made invisable with grinding and a little paint. Fred OH

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MT Pockets

01-25-2004 13:14:08




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 Re: repair of ci flat belt pulley in reply to rhudson, 01-25-2004 11:25:42  
The answer is yes. A piece of quarter inch material the same width as the pulley and longer than you think you need is what you need to start with. Clamp one end of the patch on unbroken part of the pulley. Heat with rosrbud until cherry red and bend to fit the curviture of the pulley to start. This arc will be a little too straight.Put it over something vee shaped and hammer the inside from one end to the other, periodically fitting it to the side of the pulley to see when you have it just right. Grind breaks on the pullet square and bevel them. Mark the patch to fit and cut it. Bevel both ends of the patch.(About 35 degrees would be good on all bevels. no more than forty five degrees.) If you know how to braze, go for it. If you don't know how, get someone who is experienced and is good at it. This is not the place to practice. Do not arc weld this under any circumstances except maybe four tiny places with 7018 for fit up. Good luck. MT. Pockets.

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Paul Janke

01-25-2004 12:24:51




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 Re: repair of ci flat belt pulley in reply to rhudson, 01-25-2004 11:25:42  
4 foot diameter would be about 12 foot circumference. How much is missing? I've been told, and my experience indicates, that a flat belt pulley should be crowned in the center. It also seems like they are not very critical. If you are just trying to save the old pulley, go ahead and repair it. If not, and you are looking for a pulley, use an old truck tire and wheel. I've sucessfully used car tires on the wheel. Cheap and plentiful, large variety of diameters available, you don't need much width.

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rhudson about 1.5 feet mi

01-25-2004 12:55:12




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 Re: Re: repair of ci flat belt pulley in reply to Paul Janke, 01-25-2004 12:24:51  
yeah, i have options, but i really like the s spoke design of this old pulley, i would like to save it if possable. i feel confidant of shaping replacement piece, its the welding in that worries me. i want to prevent "chaising" new cracks.



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Bob

01-25-2004 14:52:33




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 Re: Re: Re: repair of ci flat belt pulley in reply to rhudson about 1.5 feet mi, 01-25-2004 12:55:12  
If you adequately preheat the pulley, perhaps in a bed of charcoal, weld it while hot, and let it cool SLOWLY, you'll have no problems. Perhaps after welding, put it back in the fire, bank up the ashes and hot coals around it, cover the fire with some steel sheets, and let the remaining coals burn out, and wait a day or so until the remains of the fire and the pulley have cooled to room temperature before taking the pulley out of the ashes.

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Fred

01-26-2004 07:43:31




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 Re: Re: Re: Re: repair of ci flat belt pulley in reply to Bob, 01-25-2004 14:52:33  
When braising cast iron or welding it in the past, I have had good experience with preheating it before welding it and sinking it in a bed of sand. Let it there a couple of days before taking it out.



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