Step 1: Build the Cage
Step 2: Make Bars
Step 3: Make Ceiling and Floor
Step 4: Paint the Cage Black
Step 5: Install Pneumatic Cylinder and Switch
The 6 inch throw, 3 inch diameter double-acting pneumatic cylinder was a backup from another project that acutally needed such a thing. The valve is a 4-way, 2-position lever-operated control valve (part #4493k34 from McMaster-Carr). Both items are kind of pricey, so since being purchased originally for a consulting project they have been reused in a number of other projects. Compressed air is generated by a portable compressor used to power the air flow on the Squid Labs laser cutter when we take it to conferences or events.
The 4-way, 2-position valve is pretty neat. When you switch the position, it vents one side of the cylinder and pressurizes the other.
Step 6: Install Puppet Mount
Step 7: Hidden Air Lines
Step 8: Wire Up the Monkey
Step 9: Cover With Black Cloth
Step 10: Turn the Lights Down, Scare Some Kids
I know this is terrible, but I feel that my Halloween creations are only successful if a few of the kids come out crying. Two Jacob's Ladders, low lighting, this caged Yeti, and everything else in the Haunted House seemed to do just the trick.