5" wide belt on a 4" wide pulley?

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Super A
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5" wide belt on a 4" wide pulley?

Postby Super A » Fri Aug 31, 2018 1:35 pm

I want a longer belt for my 4E hammer mill. Current one is not very long and it has to be fiddlestring tight not to slip.

Ran across a nice one but it's 5" wide.

The Cub belt pulley is 4" wide. What will happen if I try to run a 5" wide belt on it?

Al
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Re: 5" wide belt on a 4" wide pulley?

Postby Shane N. » Fri Aug 31, 2018 1:37 pm

I would think it should be fine, the pulley should have a crown to help the belt stay centered. I wouldn't think a 1/2" hanging off either side would wear too bad considering how fast it will be turning.

Worst case scenario you could lay the belt down on a flat surface and use a straight edge and a lot of razor blades and cut it down to 4".
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Re: 5" wide belt on a 4" wide pulley?

Postby Bob McCarty » Fri Aug 31, 2018 1:49 pm

As Shane said, it should be fine unless that 1/2" overhang will rub on something on either end.
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Re: 5" wide belt on a 4" wide pulley?

Postby John *.?-!.* cub owner » Fri Aug 31, 2018 7:41 pm

Have you tried some belt dressing on your old belt? If you have a problem it will be on the hammer mill end. Doesn't also have a 4 inch pulley, but with a flange on the side next to the hammer mill?
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Shane N.
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Re: 5" wide belt on a 4" wide pulley?

Postby Shane N. » Fri Aug 31, 2018 8:33 pm

Al, I just remembered I’ve cut an inch off of belting before using a table saw if you can get past the smell it’s not that bad at all.
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Re: 5" wide belt on a 4" wide pulley?

Postby rjfcsa » Sat Sep 01, 2018 8:28 pm

Hey Al,
Still have not found you any screens, so much junk has been hauled off I have not seen any bigger screens that one could cut down in some while.
I never thought of belt size till you said something here. The cub pulleys and hammermills are actually 4-3/4" and I measured my belts and they are 5" and have been using that size for several years in our demonstrating. You definitely need to stake down the mill or you won't get the belt tight enough. Our 4-E had a hole in each board where it was bolted down, and I made some stakes about 12" long 1/2" dia. with an eye on one end kind of like an eye bolt that is pointed on one end. The eye is so I can stick something in it to give it a twist to pull it up. If you are not square with the hammer mill not amount of crown will keep it on, especially when you load it up it will walk off. There have been a few times, only when people are watching, that I have the fits lining them up :oops: :oops: :evil: :evil: . Mine are in the 30' total length range so 14ish feet from the mill. I remember reading somewhere in an old belting booklet, that I cannot seem to find right now, about longer belts having more grip. I don't know if it is just the weight of the belt or? I can have it pretty tight and you get it loaded and you can see it start to sag. If you notice the old steam engines like to use long belts. Take note of the direction of the unit to power needs to turn, and the rotation of the tractor belt as you might need to give the belt a half twist to get the right rotation. I would offer you a belt but in the last year I had two of my old ones just start coming apart from age so I am toying with buying a new one for the mill but at, last I checked, they are rather salty so I am looking for spares myself if I see any at sales.
Oh well that is my two cents.
Russel Foster


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