Distance Between Pulleys


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Old 03-22-20, 12:53 PM
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Distance Between Pulleys

Disregarding the speed ratios between pulleys, is the distance between the pulleys important?

I have a variable speed 24VDC motor driving a mini homemade bandsaw. All is working fine but I made the belt out of duct tape and although its working fine I want to buy a new belt and I donít know how to establish the length. Current length I have is 12Ē (total belt length) and the distance between the pulleys is about 6Ē. I have the space to go longer but I donít know if there are any rules
 
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Old 03-22-20, 01:03 PM
Z
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Nope, no difference regarding distance. The only speed/torque determination is the size of the two pulleys.

 
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Old 03-22-20, 04:35 PM
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V-Belt Length Calculator
 
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Old 03-23-20, 03:19 AM
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When I don't know what length belt I need I've always taken a small rope and put it on like you would the real belt and then measure the length of rope it took.
 
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Old 03-23-20, 03:54 AM
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In some cases there is a consideration when determining pulley spacing.
Yow want them separated to maximize belt to pulley contact on the smaller pulley but not too far apart to prevent belt slap.
On a low torque application like yours it probably would not make much of a difference.
 
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Old 03-23-20, 09:13 AM
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Long ago when I worked at an industrial supply house a guy came in and ask for some belts for his 100 year old hit or miss engine that was running a saw blade.
First thing I asked him was do you have the old belts?
Nope, can't you just look it up in a book was his reply.
I told him if I have the distance apart from the centers of the shafts and the 2 ID.s of the pulleys I could figure it out for him.
He wanted to speak to a manager to tell them I had no clue and was not being very helpful.
He leaves and comes back and tells me he has 2, 12" pulleys and the shafts are 5" apart.
I said you really mean 5' apart not 5" right.
Now he's really mad at me thinking I'm making him feel stupid.
He makes a call and someone gave him the right measurement, I figure out what he needs and hand the belts to him.
Then he says, OK mister smarty pants what the RPM's of the saw blade, I ask him what's the RPM's of the engine?
He want's to know what difference does that make, I need to know the RPM of the saw blade.
 
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Old 03-26-20, 07:41 AM
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My thanks to all for the help
 
 

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