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what determins the length of the belt for running impliments


 
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tugboattim
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PostPosted: Wed Jan 15, 2014 5:09 am    Post subject: what determins the length of the belt for running impliments Reply to specific post Reply with quote

hi all I have three deeres B/A/R and all have pullys for running thrashers/saw mills/buzz saws ect. I have a very short leather belt about 5 inches wide I figure that's for a buzz saw but any time I see a saw mill or trasher the belts about 10 inches wide and 10 times longer.is there a formula for sizing a belt for a sawmill thanks in advance tim
 
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Mike M
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PostPosted: Wed Jan 15, 2014 7:42 am    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

The old time JD pocket ledgers were full of info.
I just can't remember if that info is in them ?
Might be a good starting point in case no one chimes in with any old time rules of wisdom.
 
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Leroy
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PostPosted: Wed Jan 15, 2014 9:31 am    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

You will not find a belt on a gas tractor that is wider than 6" as that was standard width of all the pulleys. The steamers used 8" belts. Never seen or heard of a 10" wide belt. Your pulleys will all measure 6" wide so that is a wide a belt as you can use. And that belt will transmit as much and more power than you have. Belts were made in different thickness for different power loads. For light power loads like the saw you can get by with smaller belts and a buzz saw could have been run with a 3 horse hit and miss engine. Length first consideration is how they can be setup as to location. A longer belt will give slightly more traction than a short bely but are harder to get tight. Mane reason for long belt on thresher was the steem engine used to power them and you wanted the fire for the steam and the sparks that resulted form the fire as far away from anything burnable as possible because if a spark would land in the straw everything would go up in flames and no fire departments at that time to try to put the fire out.
 
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4020deereboy
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PostPosted: Wed Jan 15, 2014 6:55 pm    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

The operation care and repair of farm machinery has a lot of info on sizing belts. twenty fifth edition
 
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gtx1967jewison
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PostPosted: Wed Jan 15, 2014 8:30 pm    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

There ain't hardly a 2cyl Jd with a pulley 6" wide except maybe an H or a M. The B is wider than that & his R is definitely wider than 10", more like 14. most belts at our show are either 8 or 10" wide.
 
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Leroy
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PostPosted: Thu Jan 16, 2014 7:32 am    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

Had 46 B, 49 B, 38 A, 51 A 7 50AR all only would take a 6" belt.
 
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nlastovi
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PostPosted: Thu Jan 16, 2014 7:54 am    Post subject: Re: what determins the length of the belt for running implim Reply to specific post Reply with quote

Gtx1967jewison wrote:
(quoted from post at 21:30:19 01/15/14) There ain't hardly a 2cyl Jd with a pulley 6" wide except maybe an H or a M. The B is wider than that & his R is definitely wider than 10", more like 14. most belts at our show are either 8 or 10" wide.


If I read the document correctly, University of Nebraska College of Agriculture measured thel R as a 9" pulley face (which I think means the width).

The 820/830 test says "Belt pulley diam. 12 7/32" face 9" rpm 1125 Belt speed 3599 fpm Belt flat Length 72' Width 7" Thickness 0.216""

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1091&context=tractormuseumlit

in comparison, the 520 test says "Belt pulley diam 9 11/16"
face 7 1/4" rpm 1325 Belt speed 3360 fpm Belt flat
Length 72' Width 7" Thickness 0.216""
 
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