Help with Moments in Mechanism

In summary, "Help with Moments in Mechanism" addresses the analysis of moments in mechanical systems, focusing on the application of principles to evaluate forces and torques. It emphasizes the importance of understanding equilibrium, lever arms, and the distribution of forces in various mechanisms, providing guidance on problem-solving techniques and real-world applications in engineering and physics.
  • #1
leonardo_alex
2
0
I'm developoing one mechamical device, that we'll put two nutrunner in one gear. One spur gear will rotate the gear and put the nutrunner and one position. Each nutrunner will fix one bolt with 70Nm.

I need put one motor in pinion, but i need consider the moments to define de size of the motor.

Someone could tell me how I can calculate the result moment in the gear or how to define the best motor?


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  • #2
leonardo_alex said:
we'll put two nutrunner in one gear.
Welcome!
Could you describe how those three things connect to each other?
 
  • #3
Basicly, the two nutrunner are assembly in the gear blue. And the pinion (white) will receive a motor to rotate the gear to put the nutrunner in correct position (it's just a setup). The gear(blue) have a bearing.

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  • #4
leonardo_alex said:
Someone could tell me how I can calculate the result moment in the gear
By doing a free body diagram.
leonardo_alex said:
how to define the best motor?
Motors are sized by their power output. There are some limits on Torque and RPM depending on the design, but that can be offset with a gearbox because power is constant when transferring from one mechanism to another.

Basic info found on Youtube:

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FAQ: Help with Moments in Mechanism

What are moments in mechanism analysis?

Moments in mechanism analysis refer to the rotational effects produced by forces acting on a body. They are calculated as the product of the force and the perpendicular distance from the line of action of the force to the pivot point or axis of rotation. Understanding moments is crucial for analyzing the equilibrium and motion of mechanical systems.

How do you calculate the moment of a force?

The moment (M) of a force can be calculated using the formula M = F × d, where F is the magnitude of the force applied, and d is the perpendicular distance from the line of action of the force to the pivot point. The direction of the moment is determined by the right-hand rule, indicating whether it causes clockwise or counterclockwise rotation.

What is the difference between clockwise and counterclockwise moments?

Clockwise moments are those that tend to rotate an object in a clockwise direction around a pivot point, while counterclockwise moments tend to rotate it in the opposite direction. In equilibrium situations, the sum of clockwise moments must equal the sum of counterclockwise moments for the object to remain stationary.

How do you determine the net moment acting on a mechanism?

To determine the net moment acting on a mechanism, you must consider all the forces acting on it and their respective distances from the pivot point. Calculate the moment produced by each force (taking into account their direction) and then sum these moments. The net moment is the algebraic sum of all individual moments, which indicates the overall tendency of the mechanism to rotate.

What are some common applications of moments in mechanisms?

Moments are widely used in various applications, including the design of levers, gears, and linkages in machinery. They are also critical in structural engineering for analyzing beams and frames under load, ensuring stability and safety in buildings and bridges. Additionally, moments play a vital role in robotics and mechanical systems where precise movements are required.

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