Belt Ratio Calculator - Calculator Academy (2024)

FAQs

How do you calculate belt ratio? ›

Belt Ratio Formula

To calculate the belt ratio, divide the larger belt diameter by the smaller belt diameter.

A more precise calculation formula is: (1) L=π(R+r)+2a+(R-r)^2/a (2) L=π(R+r)+2a+(R-r)^2/4a Where L is the belt length, R and r are the radii of the two pulleys respectively, and a is the distance between the centers of the two pulleys.

We could calculate the belt pass frequency by knowing the driven shaft speed in rpm, the pitch diameter of the driven sheave and the belt length: BPF = pi*dia*speed/BL. But, we can also measure it and be much more accurate by using a tach or a strobe.

Measure the distance between the two pulleys, write down and multiply it by 2. (56 * 2= 112 in). Now, take one pulley (6 inches) then find the circumference of it (2pir). 2pir= 37.699 -> 38 in around.

Belts: A belt decreases speed in proportion to the diameters of its pulleys or sheaves. The pulley on a motor shaft is typically smaller than the one on the machine shaft. The speed ratio is R = D_L /D_S, where D_L = diameter of large pulley, and D_S = diameter of small pulley.

Synchronous Belt Tension

Te = Effective tension, lb. TT = 2.286(Q) pd Where: TT = Tight side tension, lb. Q = Torque load, lb-in pd = Pitch diameter, in. Slack Side Tension (8:1) TS = 0.285(Q) pd Where: TS = Slack side tension, lb.

An easy way to determine belt size is to simply “add 2″ to your off-the-rack pant size. For example, if you wear a 36”-waist trouser, then a 38 belt size will be a safe bet. Most will find this simple formula works best for pants worn at a traditional height—close to the natural waistline.

Step 1: Put on a pair of pants that fits well and stand in a relaxed position. Step 2: Wrap a soft tape measure through the belt loops so the tape is snug but not too tight. Step 3: Take note of the measurement to the nearest even-numbered inch (you may need to round up). This is your belt size.

As a rule of thumb, your belt size is two inches larger than your pant's waist size. For example, if you wear size 36 pants, you will probably do well with a size 38 belt. The leather and style of belt you choose can go a long way in showcasing your buckle and expressing your personal style.

This device uses the signals from the weighbridge and the speed sensor to calculate the rate of material flow using the formula Rate = Load x Speed. The belt scale integrator will then convert the calculation to a usable measurement in the form of a displayed value, analog signal, or digital output.

What is a belt rate? ›

The belt forcing frequency is known as belt pass frequency or belt rate, which is the rate at which a point on the belt passes a fixed reference point. It is always less than the speed of either sheave/pulley.

CAPACITY (TPH) = . 03 x Belt Speed (FPM) x material weight (lb. per cu. ft.)

Pulley Ratio = Diameter of Driven Pulley / Diameter of Driving Pulley. Interpret the Ratio: If the pulley ratio is greater than 1, it signifies a speed reduction, which means the driven pulley will rotate slower than the driving pulley.

To quickly calculate the outside diameter (O.D.) in inches of any 8mm pitch timing belt pulley divide the number of teeth on the pulley by ten (10). For example an 80 tooth pulley would have an 8” outside diameter (O.D.) (80 teeth / 10) or a 33 tooth pulley would have a 3.3” outside diameter (O.D.) (33 teeth / 10).

CAPACITY (TPH) = . 03 x Belt Speed (FPM) x material weight (lb. per cu. ft.)

The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.