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Antique Gas Engine Discussion

Help with flat belt pulleys

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Old 02-14-2005, 01:27:26 AM
CJ Winslow
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Angry Help with flat belt pulleys

I recently came across a source for some nice flat belt pulley material. I have three drive wheels for crane systems in a factory. The pulleys have a rubber coating on the outside edge that has worn off and rendered them useless as drive wheels. I can get the rest of the rubber off easilly enough leaving me with a nice rough cast wheel that is already bored out. The problem is that the outside is still a rough casting surface that I need to turn down. I know that flat belt pulleys have a crown to them I was wondering how many degrees this crown is so that I can go and turn them to the right angle. I am putting these on engines that are 1.5 to 2 hp and was wondering how wide the minimum width should be - in othere words how wide of a belt do I need to transmit 2 hp? The pulleys are about 4" OD. Lastly - the Jaeger that I am putting one of them on only has about three inches of crank shaft exposed to put a pulley on. What can I do to make sure that when I have the pulley on that the belt does not rub on my flywheel and wear off my fresh paint job - that would make me .

Thanks for the help - CJ
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Old 02-14-2005, 09:42:00 AM
Harvey Teal Harvey Teal is offline
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Default Re: Help with flat belt pulleys

The max crown should be "1/8 inch per foot across the face",
which works out to 1/4" in the diameter of a 12" wide pulley.
A single ply leather belt will transmit 1.8 HP per inch of width
at 1000 feet per minute. So roughly figgerin', a 4 inch pulley
at 500 rpm, being about a foot in dia, will give you about 500 fpm,
or 0.9 HP per inch of width. Go with a 3 inch belt to handle
slippage etc. Make up a big washer using some of my handy dandy
Teflon fiberglass laminate, and run it between the pulley and FW.
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Old 02-14-2005, 02:01:57 PM
Jim Tremble Jim Tremble is offline
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Default Re: Help with flat belt pulleys


When I made the pulley for my tractor, ( 6" dia. X 5" face) I cut the crown at 2 degrees. The belt tracks with no problems.

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