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spring and movement on collision

dje8269

Newbie
hello,
I'm sorry for my english but I'm french.
I'm begginer on solidwork. I try to draw a catapult for a robot ! This catapult is animed by a servo motor. This motor is use to pull a spring. When thme motor arrive at the end the spring is released, and the projectile is sent.

I have two problems :
-first : I don't know how simulate the spring action ! do you know if it's possible to do this ? when the blue object is free, I want it be return in initial position by the spring
- I would like the arms of the motor push the launcher when it touch it, for amed it .

I am attaching you a diagram for the explanation and the solidworks files.
Thank you very much if you can help me.

Jérémy
 

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