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Tractor Talk Discussion Forum

V Belts

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37 chief

03-26-2020 12:57:05




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Will belts banded together run hotter than single belts? Is there any advantage to have belts banded together. Thanks for any info. Stan




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Bob

03-26-2020 20:52:29




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
Quoting Removed, click Modern View to see

I believe that you will find that not all sheaves made over the years used for individual belts have the center-to-center groove spacing EXACTLY the same.

If that is true, there are sheaves in use that would not play nice with a banded belt.



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tom upton

03-26-2020 15:43:37




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
In answer to your first question. Depends on the application. One would think that heat dissipation would be better on single belts as slight gap between belts would allow air flow around belts helping to cool, however on some drives such as high shock loads/high starting loads the banded belts distribute H.P. requirements between all belts tending to reduce slippage and possibility of belts rolling over or even off which answers the second part of your question. There is a lot to learn on drive selection. Is this a new drive you are engineering or just wondering what to replace on an existing drive? If you let us know what you are doing I might be able to help you out? This machine center in this video clip has 4 200 H.P. drives and 2 150 H.P. drives using both banded and single v belt drives for specific reasons.

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37 chief

03-26-2020 20:22:06




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 Re: V Belts in reply to tom upton, 03-26-2020 15:43:37  
My flail mower uses two V belts. I check EBAY for replacement spare belts. Sometimes the clutch slips, sometimes the belts slip, before I can catch it. I was checking EBAY and saw two ganged together. Think there must be a reason for two made together. Stan



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Doug-Iowa

03-26-2020 15:23:16




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
Single matched belts can replace banded belts in most cases, I had a compressor that would ruin the OEM banded belt in a couple weeks. I switched it to individual belts out of necessity. I lined up the size marks and sure enough in a few hours they were no longer lined up, indicating the pulleys were worn. Still running like that for over a year now.



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Janicholson

03-26-2020 14:16:22




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
I think matched belts running in non-worn pulleys will operate at no advantage in heat compared to banded V type belts. The Banded belt might have a disadvantage in worn pulleys, especially if the wear shapes the V sides from conical. Banded belts are more demanding of pulley alignment both in axial offset, and parallelism. Jim



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Steve@Advance

03-26-2020 14:10:17




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
I don't think they would run hotter, as long as they were properly aligned,fit the pulleys, and were withing torque and RPM range.

I've heard of them before, but don't recall actually seeing them in standard V belt configuration. I don't understand how they could work on a standard sheave without the top hitting the outside of the sheave before seating down in the V. maybe they use special sheaves? About the only advantage I could see would be vibration resistance, or throwing on shock load.

I have seen them in metric sizes. Common on imported machine tools, called Polyflex. They are a polyurethane belt, oil resistant, smooth running, less vibration and flopping. Intended to give smooth, steady motion for precision machine work, getting a good finish with lathe work, etc. Very expensive!

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Russ from MN

03-26-2020 15:08:28




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 Re: V Belts in reply to Steve@Advance, 03-26-2020 14:10:17  
If the band is hitting the top of the sheave it means the sheave is worn out. We used to run them on vertical exhaust fans, worked well. A lot easier to put on than regular belts when the driven sheave is 3 feet into a tube!



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rustred

03-26-2020 13:46:28




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 Re: V Belts in reply to 37 chief, 03-26-2020 12:57:05  
what would this be on? should not make any difference as long as belt tension is tight. when wore than one belt is used they must be a matched set. buying two belts with the same # don"t mean they are the exact same length. when moulded together they are the same length.



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