How to calculate torque on a shaft?

In summary, torque is a measure of rotational force applied to an object and is important in determining the stress and strain a shaft will experience. To calculate torque on a shaft, the formula is T = F x d, where T is torque, F is the force applied, and d is the distance from the center of rotation. Several factors can affect torque, including force magnitude and direction, distance from center of rotation, and material properties. The strength and durability of a shaft are directly related to its ability to withstand torque, and safety precautions should always be taken when working with torque on a shaft. This includes using appropriate personal protective equipment, securely fastening and aligning the shaft, and regularly inspecting and maintaining it.
  • #1
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I have designed and built a steam powered turbine that I am trying to get to run a compressor. In order to choose a compressor I've been trying to calculate how much torque my turbine is producing. The only figures i have are...

RPM - found using a tachometer
Combined weight of turbine blade and shaft
Radius of turbine blade

Is there anyway to calculate the torque using these figures?
 
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  • #2
In a basic way you can take the power produced by the turbine and divide by the angular velocity of the rotor.
 

1. What is torque and why is it important in calculating shaft strength?

Torque is a measure of the rotational force applied to an object. In the context of a shaft, it is the amount of twisting force that is applied to the shaft. It is important in calculating shaft strength because it determines the amount of stress and strain the shaft will experience, which is crucial in designing and selecting appropriate materials for the shaft.

2. How do you calculate torque on a shaft?

To calculate torque on a shaft, you will need to know the force applied and the distance from the center of rotation to the point where the force is applied. The formula for torque is T = F x d, where T is torque, F is the force applied, and d is the distance from the center of rotation. It is important to note that torque is calculated in units of force multiplied by distance, such as Nm or lb-ft.

3. What factors can affect the torque on a shaft?

There are several factors that can affect the torque on a shaft, including the magnitude and direction of the applied force, the distance from the center of rotation, and the material properties of the shaft. Other factors such as friction, temperature, and external loads can also influence the torque on a shaft.

4. How does torque relate to the strength and durability of a shaft?

The amount of torque a shaft can withstand is directly related to its strength and durability. If the torque applied to a shaft exceeds its maximum allowable torque, it can lead to failure or damage. Therefore, it is essential to calculate and consider the torque when designing and selecting a shaft to ensure it can withstand the expected load and operating conditions.

5. Are there any safety precautions to consider when working with torque on a shaft?

Yes, there are some safety precautions to consider when working with torque on a shaft. First, always make sure to use appropriate personal protective equipment when handling and operating equipment that involves torque. Additionally, ensure that the shaft is securely fastened and aligned to prevent any accidents or injuries from unexpected movements. It is also essential to regularly inspect and maintain shafts to ensure they can handle the expected torque levels.

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