How Do You Calculate Torque for a Pusher Arm with a Dead Plate Friction?

In summary, the conversation discusses the need to calculate the required torque for a rotary cylinder that will be used in a project. The person is seeking guidance on how to take into account the friction caused by a dead plate attached to the arm. The response suggests creating a Free Body Diagram to calculate the torque due to angular acceleration, force of gravity, and friction. The general rule is to include all forces on the system in the FBD.
  • #1
John9490
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0
TL;DR Summary
Calculating torque for a pusher arm
Hello All,
I am designing a pusher arm for a project (Please refer attached picture), I need to calculate required torque to select a rotary cylinder.
The arm is mounted on a rotary cylinder and it has a dead plate underneath.

I understand we can calculate torque= Mass moment of Inertia x Angular acceleration, But How should we take the dead plate friction into account.?
Should i take any other parameter to calculate required torque other than this?

Thanks in Advance.

John.
 

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  • #2
You need a Free Body Diagram (FBD). Search the term if you have not yet had your statics class. That diagram will show the torque due to angular acceleration, torque due to force of gravity on the center of mass, and torque due to friction. Calculate each of those torques. Then add them up.

A general rule is that anything that puts a force on the system needs to be in the FBD. High speed movement, for instance, could require adding air drag to the FBD.
 

1. What is a pusher arm torque calculation?

A pusher arm torque calculation is a mathematical formula used to determine the amount of torque (rotational force) needed to move or push an object using a pusher arm. It takes into account factors such as the weight and distance of the object being pushed, as well as the length and angle of the pusher arm.

2. Why is pusher arm torque calculation important?

Pusher arm torque calculation is important because it allows engineers and scientists to design and build pusher arm systems that are efficient and effective in moving objects. It also ensures that the pusher arm is strong enough to handle the required amount of torque without breaking or malfunctioning.

3. How is pusher arm torque calculated?

Pusher arm torque is calculated using the formula: Torque = Force x Distance. The force is the weight of the object being pushed, and the distance is the length of the pusher arm. This formula can be modified to take into account other factors such as the angle of the pusher arm and any external forces acting on the object.

4. What units are used for pusher arm torque calculation?

The units used for pusher arm torque calculation depend on the units used for force and distance. For example, if the force is measured in Newtons and the distance is measured in meters, the torque will be calculated in Newton-meters (Nm). Other common units include pound-feet (lb-ft) and kilogram-meters (kg-m).

5. How accurate are pusher arm torque calculations?

The accuracy of pusher arm torque calculations depends on the accuracy of the input variables and the complexity of the system. In most cases, these calculations are accurate enough for practical use, but it is important to consider any potential sources of error and make adjustments as needed.

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