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Tool Talk Discussion Forum

crossing a flat belt to change direction

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Charlie

08-23-2006 07:59:37




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I'm running a crossed over flat belt to drive the sawdust blower on an old mill, but I get a lot of belt wear and occasional blowouts because I think the belt is catching on itself at the center where the two sides run right past each other. How do people deal with this issue? I have to change direction because of the way my blower has to turn.




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Fern(Mi)

08-27-2006 10:12:29




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Belt running backwards??? Check it out!!!
The flat belts we"ve used around here had tapered splices. Had that problem early on. We turned our belt end for end reversing the direction of belt rotation letting the tapered splice run off or slide off itself.
We flat belted twisted drove a hammer mill and a buzz saw rig. The self powered hay baler merely straight forward flat belt operation again minding rotation. Fernan

Fernan

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Dusty

08-24-2006 16:32:49




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
How about putting a roller between where it crosses?

Dusty



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jeffcat

08-23-2006 15:35:20




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Thinking back I have seen posts on here where guys buy new belts for roll bailers. They said that these belts work pretty good and have no seam. Who can fill us in? Jeffcat



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Rod in Smiths Falls, ON,

08-23-2006 15:26:14




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
If you condition the belt with lots of dressing it won't mind the contact with itself. The belt dressing not only makes the belt sticky when it touches the pulleys, it makes it less likely to fray from incidental contact.



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Joe in MN

08-23-2006 13:40:02




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Charlie --- you must be using an OLD BELT, if you change the Belt, get a Good Strong Belt and it won't come apart like you are seeing. one made of rubber products and fiberglass would not do that. good luck Charlie...



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Jimmy King

08-23-2006 13:02:04




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
The machines were built so the belts had to be crossed so the belts won't slap up and down.



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Sam#3

08-23-2006 11:54:11




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Check any mechanical splices for protrusions. Also any fraying which might be tying on themselves. Lastly are the pulleys absolutely square (parallel)? Every thresher or hammermill I�ve ever seen ran with a crossed belt. Most buzz saws did not except for Dad�s H John Deere.



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Sam#3

08-23-2006 12:04:54




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 Re: crossing a flat belt to change direction in reply to Sam#3, 08-23-2006 11:54:11  
Sorry, I missed the earlier post concerning the splice and fraying. The post at the crossover 'might' be a fix but may get hung on the post too. I understand the concept of using "what I got" but recognize the hazard and sooner, not later, it's going to fail.



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NEsota

08-23-2006 10:50:23




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
An idler pulley could be used to reverse direction.



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Charlie

08-23-2006 11:02:16




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 Re: crossing a flat belt to change direction in reply to NEsota, 08-23-2006 10:50:23  
I'm not sure how that would work. Is that a pulley to pulley friction connection to get a shaft going the other way?



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Mattlt

08-23-2006 10:06:00




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Could you stick something sacrificial at the point where the belt crosses itself? A wooden post, perhaps?

I vaguely remember my Dad doing something like that many years ago.



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supergrumpy

08-23-2006 08:59:05




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
my uncle used to do that on his silage blower using an M, pulley on tractor had a coating on it for good grip, he"s dead long time so I can"t ask his secrets

had long crossed belt, think the belt hardly touched unless it was swinging from torque, tractor sat about 25 feet from the blower, ran sticky black belt dressing on the belt every now and then



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Bob/Ont

08-23-2006 08:47:24




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Flat belts run best crossed. Are you sure it's not slipping on a pully that's causing the problem.
Later Bob



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Charlie

08-23-2006 09:02:55




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 Re: crossing a flat belt to change direction in reply to Bob/Ont, 08-23-2006 08:47:24  
The lacing is not that great, but I can't cut the belt back and redo it. The outer edges of the alligator lacing have broken off, and the belt is too frayed there to put in a full width lacing. I was thinking of either putting something between the opposing sides of the belt at the crossover point, or slightly twisting the blower axis and blower to undo a small amount of the twist, so there's no contact, but that puts uneven forces on the belt as it goes over the pulleys.

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Bill WI

08-25-2006 07:00:28




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 09:02:55  
Cut out the bad section and add more belt and another splice if it's to short. The belt ends have to be square and put the lace on square.



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Don L C

08-23-2006 12:41:34




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 09:02:55  
Charlie ---

Sounds like the belt is old and past its prime.....flat belts run best,crossed.....

Two cyl. JDs can damage a flat belt, if the belt "slaps".....



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bjb in NE

08-23-2006 08:33:04




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 07:59:37  
Is there any way you could move the power source to the other side of the drive pulley so you wouldnt have to cross the belt.



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Charlie

08-23-2006 08:53:41




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 Re: crossing a flat belt to change direction in reply to bjb in NE, 08-23-2006 08:33:04  
There's no way to move it, but this also gives more time on the pulley and hence more friction.



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steveormary

08-23-2006 10:40:18




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 08:53:41  
Charlie;

We run twisted belts on corn grinder and buzz saw. Never had a problem like you are talking about. A twisted belt works alot better then one you dont have to twist. I have even given belts a double twist rather then run them straight.

steveormary



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Charlie

08-23-2006 11:05:27




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 Re: crossing a flat belt to change direction in reply to steveormary, 08-23-2006 10:40:18  
Don't they rub against each other where they cross?



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steveormary

08-23-2006 12:44:48




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 Re: crossing a flat belt to change direction in reply to Charlie, 08-23-2006 11:05:27  
Charlie, yes the belt would touch where it crossed. But we never had any problems or tore the belt because of it. And it has been 5-6 years since I have done any belt work.

steveormary



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