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Flat belt operation

P

Patsdeere

Well-known Member
In my car running off a steam tractor, but would apply to a gas as well. It's 50 feet from the driven pulley.

As soon as we get some wind it blows the belt off. Have tried different tightness, crossed belt, slack belt, all with no different results. If it's not windy, it does a good job of staying on.

What's the trick for windy conditions? They had to thresh when there was wind.
 
An inside out belt will help windage or drive a T-post next to the run of the belt and slide a pipe sleeve over it as a guide.
 
In my car running off a steam tractor,

I don't understand what that means? What do you have for a pulley? Original belt pulleys for flat belts back in the day had a curve to them, they weren't actually flat. They had a rise in the center so either way the belt tried to come off, it was climbing up and would move back down to center. If either of your pulleys is actually flat, it's going to walk off.
 
As asked, both pulleys have a small crown.


cvphoto101665.jpg


cvphoto101666.jpg
 
Many times I have driven a piece of pipe in the ground so the belt just barely touches it.
Have even used a piece of PVC pipe.
 
the belt has to be tight. plus a twist in it to the inside, plus belt dressing on it. those pulleys look pretty shiny. i have been around thrashing machines here with 100 ft. belt and sometimes you had to pound a crowbar in the ground but that was seldom.
 
Maybe that's one reason the local sawmill in my hometown had a long dog house for the belt to run through, and when they weren't using the mill the belt was just rolled up in the dog house. And, check for crown on the pulleys, it's supposed to be about 1/8 inch per foot of width, but I found a chart that shows a little less, and it varies with diameter also.
 
Is belt staying tight? Or engine rocking and creeping forward loosening the belt?
I have tightened the belt, marked the ground, pulled forward, shoveled out some dirt, and back into the holes to keep engine from creeping, and keeping the belt tight.
Can you use a shorter belt? That would help. And being perfectly aligned. When thrashing, they used long belts to keep the fire away from the straw pile.
 
We pull it right by hand cranking the engine backwards (looks like a right rubber band), then chock both wheels. It seems to do ok when it isn't windy, but a gust just takes it off. I'll try belt dressing next time.
 
it has to be a long belt. you need the weight of the belt with belt dressing to stay on. a short belt would be useless.
 
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