# Design a automatic locking mechanism for two concentric cylinders

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

billy_joule
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

#### Attachments

• WP_20160424_002.jpg
24.2 KB · Views: 300
billy_joule
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.

rbelli1
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

billy_joule
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?

rbelli1
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

billy_joule
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.

rbelli1
Ya right but that was I asking how much force required to disengage the pull
I

rbelli1
Gold Member
Ya right but that was I asking how much force required to disengage the pull

No there is no friction acting on an actuator pin

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

BoB