A most cherished memory for many in the fall and Halloween season is seeing all the new haunting animatronics at retailers like Spirit Halloween, Walmart, and Lowe's. It's easy to take these treasures at face-value, but discover a deeper magick and appreciation of the products' value by exploring their mechanisms and production. Simpler machines like fan-inflated ghosts can be designed with costs as low as $20-30 while heavily animated contraptions with complex valves and motors rack up to the hundreds to thousands of dollars to make. What are some common mechanisms, materials, and labor requirements behind these spooky wonders?

The Design Process

It all starts with the scare. What do you want the viewer to see and experience? Start with the goal of the haunt.

Next, look at location. How much space do you have to work with? Where will the viewer be perceiving the automation from? In what ways will it express itself? How do you want the devices to move, and what measurements and materials are needed to achieve their purposes?

Lunging figures need hinges. Holograms depend on light projectors and glass planes. Cycling automata require clocks and loop controllers.

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Materials

A haunt figure is mostly three layers that do different jobs. A frame that holds the pose. A volume that reads as a body. A skin that takes the paint and the flex.

Steel and rod

The armature is mild steel tube, flat bar, and rod, welded into a spine, a rib grate, and limb sticks. Ball bearings go where a joint must turn for a season. Chain is used where a limb only needs to hang. Sally-class rides thicken the legs past anatomy so a figure that cycles all day does not wobble itself apart.

Formed by cutting, welding, and drilling. Hardware-store stock is enough for a single-motion prop. Attraction shops buy the same mild steel from a metal supplier, then add rod ends and bearings from an industrial catalog (McMaster-Carr, Grainger, or a bearing house). The expensive part is not the metal. It is the joint that still moves after a hundred thousand strokes.

Foam

The body volume is expanding polyurethane foam, poured into a mold after the skin is laid in, or carved from a bun and coated. It is light, so the cylinder is lifting foam and latex, not a solid. Immobile legs sometimes get only foam and a chain, no armature at all.

The liquid is a two-part mix. It expands, then cures rigid. Scenic shops buy it from special-effects suppliers (Smooth-On and the haunt distributors). Upholstery foam buns, for carved parts, come from a foam fabricator. Expanding foam is not insulation-can foam from a hardware store if the part has to hold a skin and a paint job.

Latex

The usual haunt skin. Liquid latex is poured or slushed into a plaster mold, left until a few millimeters set against the wall, then the excess is poured out. That skin is flexible, cheap, and easy to paint with more latex so the color stretches. It also rots in sun and ozone, and it tears at a seam that flexes all October.

Sourced as molding latex from a mold-making supplier or a haunt prop house. The mold itself starts as clay, then gypsum plaster. One clay sculpt, many skins. That is why a catalog monster can ship as a run of nine.

Silicone

The ride-grade skin. Poured, not slushed, thicker than latex, often about a quarter inch on a face. It takes repeated flex, paint, and weather better, and it costs more in material and in mold work. Sally has long used it for faces that have to talk all season. A porch prop almost never justifies it.

Platinum-cure silicone from the same special-effects catalogs. The mold has to be compatible with it. Latex and silicone are not interchangeable in one mold without a release plan.

Air hardware

Cylinder, hose, fittings, regulator, solenoid. The cylinder is aluminum or steel, bought by bore and stroke from a pneumatics house (FrightProps and other haunt vendors resell them; the industrial brands are the same parts). Hose is polyurethane, push-to-connect. The solenoid is an electric valve. None of this is fabricated in the monster shop. It is specified and plumbed.

Cloth, for the light air props

Yard inflatables are sewn polyester, printed, with internal baffles. Bounce-house scale Halloween inflatables are PVC vinyl, heat-welded. A blower, not a compressor, holds them up. Fabric comes from a textile supplier or, for vinyl structures, an inflatable manufacturer. Different machine, different bill of materials.

If it has to hold a pose with the power off, it is steel, foam, and latex or silicone. If it dies when the fan stops, it is cloth.

 

Production

A catalog monster is a copy problem. One sculpt becomes a mold, the mold becomes a run, the run gets the same armature, the same valves, and a control file so the tenth figure lunges like the first. A one-off for a single haunt skips the run and keeps every other step.

Sculpt

The shape starts in clay on a stand. Oil-based clay, the kind car modelers use, stays workable. Water clay is cheaper and gets sealed before molding. The sculptor sets the pose the guest will read at rest: the sit before the sit-up, the closed mouth, the arm down. Gore and wrinkles are cut in here. After this, the shop is mostly copying.

Mold

Plaster or fiberglass goes over the clay. A body mold is heavy, so it is often split at the waist, and the head is its own piece. When the mold releases, the clay original is done. What is left is a cavity. Distortions will pour a run of the same mold, nine clowns when only three are on order, because a mold is the expensive object and an empty mold is wasted season.

Dry time is part of the schedule. A fiberglass mold can sit a day or two before it is safe to foam against. Shops put fans on wet molds. The calendar is not “sculpt Friday, ship Monday.”

Skin

Liquid latex is slushed into the cavity, rolled so it coats the wall, and left until a skin of a few millimeters sets. The rest is poured out and reused. Ride faces skip this and get silicone poured to a thicker, even wall, because a mouth that talks all summer will tear a latex slush. Excess skin is trimmed at the seam after the pull.

Bones, then volume

A steel armature is welded to the motion, not to anatomy charts. Spine, rib grate, rod for the arms, a bearing where the torso must turn, chain where a leg only hangs. The armature goes into the mold or into the pulled skin, then two-part polyurethane foam is poured in to make the flesh. The pour is capped so the foam does not climb out of the mold. Lower bodies that never move sometimes get foam and chain only.

When the foam is cured, the body comes out of the mold. Seams are trimmed. This is the “cutting and seaming” room on a Distortions walk-through: flat skins, electric-chair bodies, trees in pieces, all waiting for paint.

Mechanism

The figure is mounted on the joint that does the verb. A sit-up sits on a bearing or a hinge, with the cylinder rod on a pivot so the straight stroke can become a rotation. A lunge gets a stop. Cylinders are bolted to plates, hosed to a solenoid, and the solenoid is wired to a small controller. Sound is recorded, then loaded so the valve and the scream share a clock. At Sally’s scale the same assembly is built for a duty cycle: rise, play, drop, every time a vehicle passes, all day. The steel is heavier. The valve box is digital. The order of operations is the same.

Paint and costume

Paint is often latex mixed with binder so it flexes with the skin. House paint alone cracks at the elbow. Eyes, teeth, and hair go on last. Costume goes on after the motion is proven. A wig glued down before the first test is how a shop loses a Saturday.

Test

Power and air off while hands are in the linkage. Then a low-pressure cycle, then full pressure, then a count: fire, hold, reset, arm the trigger again. The pass condition is dull. It returns to the same pose, the hose does not rub through, the guest path is outside the stroke. A factory segment on a thrashing figure shows the end of this line in miniature: clay, plaster, latex, welded bones, foam, bearing, cylinders, a box on an amp, makeup.

Home production is the same sequence with a bought cylinder and a worse bracket. Sculpt or buy the body. Mount the hinge. Plumb one valve. Cycle it with the costume off.

 

Designing Your Own

Check out Bramble and Finch's and other creators' homemade Halloween automata and other homemade Halloween machines. Study the design process behind the production. Think: what spooky machinery are you inspired to make yourself?