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Hi. first time making some prop so might need some help.
I have an idea of stacked boxes that will be attached to each other and will be pushed when someone passes nearby, like they are going to fall. And then retracted back. Location is outside near external wall, I have a window on 2nd floor there so I can use some push-pull device there. I'm thinking of linear actuator, but still not sure if it will do the job. Actuator I want to buy can travel 46 mm/s and has a stroke 200mm. That may be enough to push but I'm not sure if that's enough to draw this back...
Does anyone has any ideas of what I need to use here? May be I'm wrong with linear actuator and there is something easier...

Thanks
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I love the "Falling Boxes" version. It has true falling movement that is stopped. Will look real. I have seen similar gags over the years that are solid pneumatic and they look too controlled.
 

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If the wire was connected to the piston and it retracted far enough down, it will pull the boxes back into place. One moving part to run the whole thing.
 
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