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Farmall & IHC Tractors Discussion Forum
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O/T for Dave in CT V belt Cment Mixer

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Janicholson

10-06-2005 13:06:06




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Dear Dave,
Our very old mixer originally had a water cooled single slow speed gas engine on it. It was replaced at some point before we got it with an old Westinghouse electric motor of about 3/4 hp (it draws about 8 amps when running loaded. The motor has about a 5:1 reduction from 1275 to 255 rpm. The V pulley on the motor is is about 6" in dia. and 5/8 wide. The pulley on the mixer is about 12 diameter and 2-1/2 wide. 2:1 ratio now 127 RPM. It has approximately a 10:1 bevel gear on the mixer resulting in about 12.7 rpm on the drum. These are best guesses as I am not near the mixer to check for real.
JimN

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Dave in CT

10-06-2005 15:40:17




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 Re: O/T for Dave in CT V belt Cment Mixer in reply to Janicholson, 10-06-2005 13:06:06  
Thanks for the info. Not to make this go on forever but, you run the V belt just on top of the flat pulley on the mixer? I would imagine you don't have a wandering problem. Is this achieved just by the proximity of the V pulley on the motor and the tension?



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Janicholson

10-07-2005 06:21:49




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 Re: O/T for Dave in CT V belt Cment Mixer in reply to Dave in CT, 10-06-2005 15:40:17  
Ahhh,
The operation of a flat belt drive (though not obvious) is that the pulleys have a crown on them. This crown may be only a few thousandths of an inch on a 2.5 wide pulley, however it may be as much as .250" on a wide large pulley used on a threshing machine. The belt (either flat or v running on flat pulleys) always seaks the highest fattest part of the pulley. The edge of the belt sees the larger diameter in that direction and climbs it, just like a car's steering will pull toward the edges of a wear groove on the highway.
The task of aligning a belt system is easier than it appears due to the design of the pulleys and the principle of operation. Flat belts are more efficient than V belts when designed correctly. V belts have far more parasitic friction as the belt wedges into the groove. Flat belts do not. V belts self distruct when confronted with load slippage, flats do not (they usually come off, providing a "mechanical fuse" in the mechanism).
I hope this helps, an old threshing machine custom thresher guy poked this down me on a lunch break (from playing with Rumley oilpulls).
JimN

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