Most Halloween props just sit on the grass. But the ones that jump out at you require a lot of work to build. It takes a mix of heavy engineering and art to make a robot monster look real.
Building The Skeleton
It starts with a strong frame. You cannot just use thin plastic if you want the prop to move fast without breaking. Makers build skeletons out of PVC pipes or welded steel.
The frame acts as the foundation. It has to be heavy and balanced so the prop does not fall over when it lunges forward. It also has to hold the weight of the heavy motors and the thick rubber skin.
Adding The Movement
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A metal frame does not move on its own. Makers attach small electric motors or air cylinders to the joints.
Air cylinders use compressed air to push parts out really fast. That is how a zombie suddenly jumps up from a grave. The makers wire these cylinders to a small computer board. They program the board to trigger the movement the second someone walks past a hidden motion sensor.
Dressing The Monster
A moving metal frame is not very scary. The final step is covering it all up. Makers sculpt creepy faces out of clay and cast them in soft latex or foam.
The rubber skin has to be flexible. It needs to stretch safely when the jaw opens or the head turns. Then the makers add dirty clothes and fake hair. The clothes do double duty. They make the character look real, and they hide all the messy wires and air hoses inside.
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