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Tool Talk Discussion Forum

Flat belts

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Keith Stansell

04-16-2005 08:45:11




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Several of old fellows were having an important discussion on why flat belts were always twisted when they were used on old feed grinders and other belt driven implements. I don't believe I ever have seen one run without being twisted..... Waiting for answer




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JMS/MN

04-16-2005 19:15:08




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 Re: Flat belts in reply to Keith Stansell, 04-16-2005 08:45:11  
If used on threshing machines, they don't whip as much in the wind when twisted. If the direction is already right and the wind whips it off, you give it two twists- but it takes a long belt to do that.



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Missouri Boy

04-16-2005 17:50:38




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 Re: Flat belts in reply to Keith Stansell, 04-16-2005 08:45:11  
My dad told me that in the sawmilling and threshing days a belt was twisted a full turn to get more contact with the pulley. If only a change of direction was needed the belt was given a half twist. He was born in 1885 and followed the sawmills.



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kidbob

04-16-2005 09:24:53




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 Re: Flat belts in reply to Keith Stansell, 04-16-2005 08:45:11  
When you twist a flat belt it does change the direction of the driven pulley, but it also reduces the bounce of the belt between pulleys on a long belt.



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Rod (NH)

04-16-2005 09:14:46




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 Re: Flat belts in reply to Keith Stansell, 04-16-2005 08:45:11  
Hi Keith,

I don't know about feed grinders but the only reason I am aware of to twist a flat belt is to change the direction of rotation of the driven implement. I don't twist the flat belt that runs my cordwood saw. If I did, it would be going backwards :o).

third party image Rod



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MPK

04-16-2005 20:01:16




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 Re: Flat belts in reply to Rod (NH), 04-16-2005 09:14:46  
Another way you can twist the belt without changing direction is to turn it inside out on just one end. This will also help a lot to prevent whipping especially if it's windy. I have done it and have seen others do it.



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Pitch

04-17-2005 04:38:12




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 Re: Flat belts in reply to MPK, 04-16-2005 20:01:16  
My grandfather and father always twisted the belt. Said it was to keep it from bouncing and slappping which would cause it to slide off the pulley.



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