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Can any body help me, I want to build my first Pneumatic prop this year, and i like the jack in a box clown style. does any one know of a tutorial
for this.or a you-tube vid that show the working. any help will be most welcome.
 

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Here's a simple one I built about 9 years ago.

It's about as simple as it comes for this type of prop.

One 18 inch throw air cylinder and a 5 RPM to turn the handle

Have to remember 9 to 10 years ago most people still had dial up internet and a video was a huge file so you will have to make due with the small GIF to see it in action







The top is raised by the head of the prop and gravity lowers it

Build the box run a 2x4 from side to side drill a hole in the center and put your cylinder through the hole
 
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