Grouping: Pairs or individual
Take-home: Motorized drawing made by machine; motor returned
Key ideas: Vibration, eccentric mass, balance, electrical connection, emergent pattern.
Start with: Run motor centered, then add off-center weight to show vibration.
Success check: Machine moves independently and leaves a repeatable type of mark.
Try changing: Weight position/mass; leg angle; body mass; marker count.
Preparation: Prep motor leads and eccentric weights; make 3 differently tuned examples.
CNC preparation: Cut motor-body brackets if desired.
3D-print preparation: Print reusable motor clips/weights.
Lesson flow: Day 1: Build → run → rebalance/modify
Video:
Scribbling Machines
Safety and cleanup: Eye protection during fast spinning; secure eccentric weights; motors collected.
https://www.exploratorium.edu/tinkering/projects/scribbling-machines
https://www.youtube.com/watch?v=GF7Ww_j0G6s