Re: O/T for Dave in CT V belt Cment Mixer

Posted by Janicholson on October 07, 2005 at 06:21:49 from (199.17.6.175):

In Reply to: Re: O/T for Dave in CT V belt Cment Mixer posted by Dave in CT on October 06, 2005 at 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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