# How do you calculate timing belt torque?

## How do you calculate timing belt torque?

The torque rating formulas for MXL sections are: Qr = Kz [ d ( 1.13 – 1.38 x 10-3 d2) ] For belt width = 0.12 in. Qr = Kz [ d ( 1.88 – 2.30 x 10-3 d2) ] For belt width = 0.19 in. Qr = Kz [ d ( 2.63 – 3.21 x 10-3 d2) ] For belt width = 0.25 in.

**How do you calculate teeth in timing belt?**

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).

### How do you calculate motor drive torque for belt and pulley system?

To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.

**How do we calculate torque?**

#### How is pulley ratio calculated?

There are complicated formulas for determining pulley ratios but in generic, layman terms, simply divide the driven component (pump) by RPM, the driver component (motor or engine) rated by RPM to get the required ratio. In the example below, the pump RPM is 1070, for full output, while the motor is 1750 RPM.

**How much play should a belt have?**

Pinch that point between your index finger and thumb and move it back and forth. The belt should have about a half an inch of play when at the appropriate tightness. If there is less than a half an inch, the belt will need to be loosened, if there is more, it will need to be tightened.

## How is tightening torque calculated?

The basic formula T = K x D x P stated earlier takes these factors into account and provides users with a starting point for establishing an initial target tightening torque.

**How is torque coefficient calculated?**

T = K D F/12

- T = Target Input Torque (ft-lb) This is your input torque from your torque wrench determined by your specified torque.
- K = nut factor. This is your X if you are doing testing,
- D = nominal diameter (bolt diameter) of the fastener (in.)
- F = target preload (lb)

### How is pulley torque calculated?

**How do you calculate engine torque from RPM?**

- Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
- Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
- Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
- Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.

#### How is pulley timing ratio calculated?

The speed ratio is defined as the ratio of the large to small pulley size and can be calculated simply by dividing the number of teeth in the large pulley by the number of teeth in the small pulley.