Belt length, distance between pulleys
How to calculate the length of the pulley belt and the distance between the wheels. In this article, we are going to look at some pulley belt calculations with real world examples.
Scroll down for the YouTube tutorial on this item
As shown in the image below, an induction motor is connected via a belt to drive two pulleys that will drive the centrifugal fan. That's pretty typical of what you might find in an Air Handling Unit or AHU.
You would also have this setup on some pumps and some conveyors as well.
The two things we're going to calculate in this video are the length of the belt (how long or should it be?) and also the distance between the two pulleys, which we're just going to reverse this calculation to find that.
These calculations are primarily for existing installations, but you can also incorporate them into your design if you want to calculate the required belt length, as long as you know the distance between the two pulleys and the size of the pulleys. The second part, the distance between the pulleys, is if you already know how much belt length you need and you also know the diameter of the two pulleys. But you don't know exactly what the distance between them should be.
Calculate the length of the belt from the pulley
I just want to point out that these calculations may vary slightly from the real world scenario, but this is the best calculation you can make to get the most accurate number.
First, let's see how long the belt should be on the pulley. In this example we are going to look at the belt between the induction motor and also a centrifugal fan in an AHU.
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| Known Dimensions to Calculate Belt Length |
We also have pulley 2 and we also know the diameter of this pulley. Again, this is either taken from the manufacturer's data or measured. The distance between centers of these two pulleys is also known.
The image above shows the formula we will use to calculate this. It seems quite long but it is not as complex as it seems at first glance. I also color coded the numbers as much as possible to make it a little easier. And I also divided the calculations into metric and imperial. So whatever units of measurement you use, you can track them.
Now we can tabulate our numbers. Remember that we first calculate the parentheses.
Calculate the distance between the pulleys.
If we need to calculate the distance between the centers of the two pulleys, we can use the following calculations to approximate. We will need to know the diameters of the pulleys as well as the length of the belt.
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| Known dimensions for pulley distance calculation |
The image above illustrates the dimensions we need and each one is color coded to make it a little easier.
You can do it manually OR you can download our excel sheet!
Link here: http://engineerz.club/Pulley-Calculator
If you are using the metric system, you can use the following calculations.
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| Pulley Distance Calculation METRIC |
If you use the imperial system, you can use the following calculations
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| Calculation of the distance of the IMPERIAL pulley |
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