Flat belts

riverbend · Sep 1, 2015

I want to use my 350 to run a Massey Harris model 60 combine like a threshing machine. It is a long story. The driven pulley is about 18" in diameter and the shaft is supposed to turn at 920 rpm. That comes out to running the belt at 4500 feet per minute.

We tried with my neighbor's old flat leather belt and got the shaft up to 800 rpm, but chickened out going any higher. I did not want to break his belt at an $800 replacement cost. How fast can you run a leather belt ? Are there newer style belts that will go that fast (4500 fpm) ?

Thanks

Greg

rustyfarmall · Sep 1, 2015

(quoted from post at 13:16:15 09/01/15) I want to use my 350 to run a Massey Harris model 60 combine like a threshing machine. It is a long story. The driven pulley is about 18" in diameter and the shaft is supposed to turn at 920 rpm. That comes out to running the belt at 4500 feet per minute.

We tried with my neighbor's old flat leather belt and got the shaft up to 800 rpm, but chickened out going any higher. I did not want to break his belt at an $800 replacement cost. How fast can you run a leather belt ? Are there newer style belts that will go that fast (4500 fpm) ?

Thanks

Greg

A smaller pulley on the combine, or a larger pulley on the tractor will get you there.

gene bender · Sep 1, 2015

The condition of the belt is how fast you can run 920 is not fast hammermills ran lots faster than that

CGID · Sep 1, 2015

I've got a 1902 Diston catalog which contains some info on the use of belts. One sentence reads: "Belt motion should not exceed 3,000 per minute where narrow belts are run over small pulleys a distance of 15 feet between shafts, and which gives a sag of 1 1/2 to 2 inches in the belt is a good practice." I'm thinking a period should follow 3,000 per minuet, a new sentence should begin with "where" and that it's "feet" per minuet being referred to. As mentioned before, the final drive speed can be managed with pulley size.

Janicholson · Sep 1, 2015

If the combine was originally equipped with that 18 inch pulley, the belt speed was beyond recommendations. If it is a different pulley, I would replace it with one that is 2/3 the size (in circumference) Jim

Andy Martin · Sep 1, 2015

Or 2/3 the diameter, whichever is easier to measure.

ejr-IA. · Sep 2, 2015

We ran a irrigation well with a H and the RPM of the well was 1750 .Large flat pulley on the H and real small on the pump.

gene bender · Sep 2, 2015

Material of belts has changed so that very old data just dont mean anything now.

riverbend · Sep 3, 2015

Had an interesting talk with an engineer from a belting company today. He said leather belts worked because they slip a little and can stand it until the machine comes up to speed. A new rubber belt grips a lot more and can't take the shock loading going from zero to 4500 fpm, the speed did not seem to be an issue. They have to spec belts to handle an operator who doesn't care if something gets busted. There is not enough of this equipment around anymore so no one knows much about it ( it was disappearing when he was getting started 30+ years ago ). His opinion was that if I started out slow and gave the belt time to bring the machine up to speed, it would work just fine. There is new belting that works as well as leather, but it as just as expensive.

I ordered a 50' belt and I'll let you know if it blows up.

Greg

Flat belts

riverbend

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rustyfarmall

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gene bender

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CGID

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Janicholson

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Andy Martin

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ejr-IA.

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gene bender

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riverbend

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