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Hi Matt

Could you please explain how to calculate belt length

Regards

Bernie

Hi Bernie,

Accurate belt length is found with the formula from the link below:

http://www.chiefdelphi.com/forums/attachment.php?s=569d2967f8a6bc711545a1d746b01

Where D is the diameter of the large pulley, d is the diameter of the small pulley, and c is the center distance between shafts.

As an example, we take the formula belt length = 2C + 1.57(D-d) + ((D-d)x (D-d)/4C)

If we had a 6" pulley, and an 8" pulley on 20" centers, we would simply plug in the numbers and follow BEDMAS rules for calculations (Calculate Brackets first, then any exponents, then division or multiplication, and finally any addition or subtraction)

For our example, we would then have:

2 x 20 + 1.57 (8+6) + ((8-6) x (8-6)/ (4x20)=

40+1.57(14)+((2X2)/80)=

40+21.98+.05=

62.03"

For approximate belt length, we would only use the first part of the equation:

2C + 1.57 (D+d)=

40+ 1.57(14)=

61.98"

In both examples, 1.57 is used as a constant and is used because it is equal to half of pi (3.14)

Please let me know if you have any further questions.

Regards,

Matt

Plant Operations/Maintenance

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