PROJECT GUIDE · PAPER ENGINEERING
Build a Paper Automaton
Create a hand-powered paper machine, explore how simple mechanisms transfer motion, and turn that movement into a character, scene, or story.
HOW THE PROCESS WORKS
Turn, transfer, move.
INPUT → MECHANISM → OUTPUT
You provide the input by turning a handle. An axle carries that rotation into a cam, crank, lever, slider, gear, or linkage. The mechanism changes or transfers the motion, and the output brings a paper character or scene to life.
START HERE
Begin with a cam and follower.
As the axle turns, a rotating cam pushes a follower upward. Gravity or another return method lets the follower move down again. Attach a lightweight paper element to the follower and that repeated movement can become bouncing, dancing, nodding, flapping, opening, or disappearing.
Build tip: test the mechanism before adding the character. Friction, alignment, and contact problems are easier to see while the moving parts remain visible.
MECHANISM BASICS
Meet the parts inside the machine.
Each part has a job. Start with a few simple components, then combine them as your ideas become more complex.
Handle & Axle
The handle supplies the input. It rotates the axle running through the frame and turns the drive pieces attached to it.
Cam & Follower
A cam changes the distance between its edge and the axle as it rotates. A follower rests against it and transfers that changing height to the output.
Guide
A guide keeps a follower or slider moving in the intended direction instead of twisting, leaning, wobbling, or binding.
Crank
An off-center connection on a rotating axle converts rotation into repeated back-and-forth or curved movement.
Lever & Rocker
A lever pivots around a point. A follower can push one end so the other end waves, rocks, or changes direction.
Linkage & Gears
Connected pieces transfer movement across a design. Toothed gears can also change rotational direction or speed.
BUILD A SIMPLE AUTOMATON
Start with the mechanism. Add the story afterward.
Build and test each part before moving to the next. Small adjustments are part of the engineering process.
1. Build the frame.
Create a sturdy folded-card or cardboard housing. Opposite side walls will support the axle, and the inside needs enough room for the mechanism to rotate.
2. Add the axle.
Run the axle through both sides of the frame. It should rotate freely without excessive wobble.
3. Add the handle.
Attach a small crank or handle to one end. Turn it several times before adding anything else.
4. Add a cam.
Secure the cam to the axle inside the frame so it turns with the axle instead of slipping around it.
5. Add the follower.
Position the follower above the cam and guide it so it can move smoothly without leaning.
6. Test the movement.
Look for rubbing, bending, loose axle holes, follower twisting, cam slip, or lost contact. Adjust before decorating.
7. Add a character or scene.
Ask what the movement could become. A vertical motion might suggest jumping, dancing, chewing, hammering, growing, bouncing, or swimming.
MATERIALS
Build with what you have.
A forgiving starter build can use ordinary classroom or household materials. Stiffer board helps the frame stay aligned, while lightweight paper works well for moving character parts.
- cardstock, thin cardboard, or recycled cereal-box board
- scissors, glue or tape, ruler, and pencil
- a blunt scoring tool for fold lines
- a rolled-paper axle or wooden skewer
- drinking straw pieces for simple bearings or guides
- scrap paper for characters and decoration
MOTION LAB
Change one thing and see what happens.
Treat your automaton as an experiment. Change one variable, test again, and describe how the output motion changes.
Move the axle hole.
Place it farther from the center of an eccentric cam. Does the follower travel farther?
Change the cam shape.
Does the output rise slowly, fall quickly, pause, or bounce more than once during one turn?
Add a second cam.
Can two characters move together or alternate their timing?
Add a lever.
Can an up-and-down follower make an arm wave sideways?
Change the crank radius.
Observe how the offset affects the distance and path traveled by a slider.
Change the character.
Keep the mechanism identical and discover how many different stories the same motion can tell.
Big idea: one tested mechanism can support many different creative outputs.
TRY THESE MOTIONS
Start with what you want to move.
You do not need to know a mechanism name first. Begin with the motion you want, then choose a mechanism that can create it.
UP AND DOWN
Cam + Follower
Bounce, nod, rise, or disappear and reappear.
BACK AND FORTH
Crank + Slider
Create a vehicle, piston, or pushing-and-pulling motion.
WAVE OR ROCK
Lever / Rocker
Make an arm wave, a head nod, or a seesaw rock.
ALTERNATE
Double Cam
Coordinate feet, two dancers, or characters that take turns moving.
ROTATE
Gears / Shaft
Turn a wheel, sign, spinner, or miniature turntable.
TRANSFORM MOTION
Linkages
Combine or redirect motions for mechanical storytelling.
WHY IT WORKS
Small changes create different motion.
Automata make mechanical ideas visible. As you build, you are exploring rotation, translation, oscillation, displacement, timing, alignment, friction, pivots, constraints, cause and effect, and iteration. The decoration and the mechanism can change independently, or the character itself can become part of the moving structure.
TROUBLESHOOTING
If it does not move smoothly, investigate.
A mechanism that does not work yet is giving you useful information. Look closely, identify one likely cause, and test one change at a time.
The handle is difficult to turn.
Check whether the axle rubs tightly against the frame or a cam touches a wall.
The follower does not move.
Make sure the cam is secured to the axle and reaches the follower throughout its rotation.
The follower leans or sticks.
Adjust the guide. Too little clearance can bind; too much clearance can wobble.
The follower stays raised.
Confirm that gravity can return it freely and that no decoration is rubbing or catching.
The frame bends.
Reinforce the axle area or rebuild the frame with stiffer card.
The character stops the motion.
Reduce its weight or prevent it from pulling the follower sideways. Test with a small blank paper tab first.
DESIGN CHALLENGE
Make the movement tell a story.
Choose one mechanism and build a character or scene around the motion it naturally produces.
- Make two characters take turns moving.
- Make something wave even though the original motion moves straight up and down.
- Make something bounce twice during one turn of the handle.
- Make a character disappear and return.
- Build two different characters that use exactly the same mechanism.
- Invent a cam and predict its motion before testing it.
KEEP EXPLORING
Learn from other automata makers.
Explore cams, cranks, gears, linkages, folded structures, and mechanical storytelling through these credited learning resources. External links open in a new tab.
Rob Ives — Essential Mechanisms
Explore a paper-engineering collection organized around cams, cranks, gears, and compound mechanisms.
Rob Ives — Paper Engineering
Browse projects, mechanism resources, books, and examples from a longtime paper engineer and automata maker.
Exploratorium — Cardboard Automata
Use a museum-tested introduction to cardboard automata built around cams, followers, simple materials, experimentation, and storytelling.
Cabaret Mechanical Theatre — Making
Explore workshops, mechanism learning, maker tips, videos, and contemporary automata.
PaperMech — Mechanism Tutorials
Explore movement-focused paper mechanisms including cams, cranks, gears, and rack-and-pinion systems.
MIT K-12 Maker Lab
See a classroom maker activity that connects cardboard automata with mechanical functions, engineering design, and self-expression.
Oak National Academy — Cams
Connect cranks, axles, cams, followers, and animated output through a structured classroom lesson.
CODING EVERY DAY PAPER AUTOMATA LIBRARY
This project is growing.
Return as new original mechanism guides, motion experiments, printable resources, photographs, and demonstrations are added. Begin with the external learning resources above, notice how different makers solve mechanical problems, and use those ideas to invent your own solutions.
Make the movement your own.
Start with one simple mechanism. Turn the handle. Watch carefully. Change one thing. Then decide what your machine wants to become.