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Tom F.
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Popular Science - Weaponology - Tom F. Crawford

Join Date: Sep 2007
Posts: 8

Pulley Formula?

01/06/2008 4:35 PM

There is a formula that is used to determine the length of a belt between two pulleys from center shaft to center shaft.

Does anyone know this formula?
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millrat
Active Contributor

Join Date: Jan 2008
Posts: 10
#1

Re: Pulley Formula?

01/06/2008 5:36 PM

Tom- there are at least two different formula's

Open belt formula:

2xCD+[1.57X(D+d)]+[(D-d)2 /4xCD]

Crossed belt formula:

2xCD+[1.57X(d-D)]+[(D+d)2/4xCD]

Where:

CD= center distance

D= large pulley dia.

d=small pulley dia

-Keith
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Anonymous Poster
#7
In reply to #1

Re: Pulley Formula?

01/08/2008 3:03 PM

For the Crossed belt formula:

2xCD+[1.57X(d-D)]+[(D+d)2/4xCD]

Change from "d-D" to "D-d"

jmk
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millrat
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#8
In reply to #7

Re: Pulley Formula?

01/09/2008 4:31 PM

My bad

-Keith
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Beej50
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Engineering Fields - Piping Design Engineering - New Member Australia - Member - New Member

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Location: Childers, Queensland
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#2

Re: Pulley Formula?

01/07/2008 1:46 AM

The other way is to draw it on AutoCAD and let it measure the distance. Seeing is believing! Make sure you use the diameters created from the mid point of belt (or near enough mid point)!

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Bill
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#3
In reply to #2

Re: Pulley Formula?

01/07/2008 3:15 PM

Actually, V-belts are measured around the outside, not the midpoint.

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Beej50
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#4
In reply to #3

Re: Pulley Formula?

01/07/2008 4:10 PM

Actually, V-belts are measured around the outside, not the midpoint.

Actually, they are measured from the PITCH HEIGHT that is a point between half and three quarters up the belt! Or, at least they are in all my books. Granted, it makes little difference to the outcome!

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Bill
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#5
In reply to #4

Re: Pulley Formula?

01/07/2008 4:28 PM

I'll refer you to this page at Gates Power Transmission. Charles Gates invented the Vee Belt.

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Beej50
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#6
In reply to #5

Re: Pulley Formula?

01/07/2008 5:33 PM

Thanks for that. It's a very useful site. ALSO it agrees with my previous statement that Gates refers to as EFFECTIVE DIA (Des) fully described in 'sizing belts' on the site you referred me to!

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