Design a automatic locking mechanism for two concentric cylinders

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Discussion Overview

The discussion revolves around calculating the force required to pull an actuator pin from a solid cylinder in a mechanical system involving two concentric cylinders. Participants explore concepts related to friction, shear force, and the application of Newton's second law in this context.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the force needed to pull the actuator pin, providing details about the weight of the solid cylinder, angle of inclination, and coefficient of friction.
  • Another participant questions whether the inquiry is homework and suggests drawing a free body diagram to analyze the forces involved.
  • A participant confirms that friction acts on the solid cylinder due to its interaction with the hollow cylinder and mentions calculating the force acting on the actuator pin.
  • It is noted that if there is no friction on the pin, no force is required to retract it, but an upward force would be needed to prevent it from retracting under its own weight.
  • Participants discuss the relevance of shear force in the context of the actuator pin and clarify that friction is only acting on the solid cylinder.
  • One participant asserts that real mechanical systems will have friction, implying that some pull force will likely be necessary to disengage the pin.
  • Another participant reiterates the request for the specific force required to disengage the pin, emphasizing the absence of friction on the actuator pin.

Areas of Agreement / Disagreement

Participants express differing views on the role of friction in the system, particularly regarding the actuator pin. While some assert that no friction acts on the pin, others suggest that real-world conditions would necessitate a pull force due to friction on the solid cylinder. The discussion remains unresolved regarding the exact force required to disengage the pin.

Contextual Notes

There are assumptions regarding the presence of friction and its effects on the actuator pin and solid cylinder. The discussion does not resolve the mathematical steps needed to calculate the required force.

karna soma shankar
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How much force required to pull the actuator pin from the solid cylinder
Weight of the solid cylinder is 15kg
And angle of inclination 30 ,
Coefficient of friction 1.5
WP_20160424_001.jpg
 
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Is this homework?

Do you know Newtons second law? Can you draw a free body diagram?
Is friction acting on the pin and/or the cylinder bore?
 
Yes Friction acting on solid cylinder due to slides on a hallow cylinder ...

Actually I m already calculate the force of solid cylinder acting on a actuator pin
F=wsin30-sliding friction force
 

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karna soma shankar said:
Yes Friction acting on solid cylinder due to slides on a hallow cylinder ...
If there's no friction on the pin then it doesn't require any force at all to retract it. In fact it'll require an upward force to prevent it retracting under it's own weight.
 
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Thank you ...
But I need how much force required to pull the pin from the solid cylinder ...
Here shear force acting on the actuator pin
 
karna soma shankar said:
Thank you ...
But I need how much force required to pull the pin from the solid cylinder ...
Here shear force acting on the actuator pin
Shear force doesn't matter. Was there something in post #4 you didn't understand?
Is there friction acting on the pin or not?
 
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billy_joule said:
Shear force doesn't matter. Was there something in post #4 you didn't understand?
Is there friction acting on the pin or not?
No there is no friction acting on an actuator pin the friction acting only on solid cylinder
 
karna soma shankar said:
No there is no friction acting on an actuator pin the friction acting only on solid cylinder
OK, then post #4 stands.

Obviously real mechanical systems do have friction so the pin will probably require some pull force to disengage.
 
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Ya right but that was I asking how much force required to disengage the pull
I
 
  • #10
karna soma shankar said:
Ya right but that was I asking how much force required to disengage the pull

karna soma shankar said:
No there is no friction acting on an actuator pin

So less than zero as billy joule said in #4 and #6.

BoB
 

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