Grouping: Pairs
Take-home: Working pantograph + enlarged/reduced drawing
Key ideas: Linkages, pivots, geometric similarity, scale factor, constrained motion.
Start with: Trace a small shape while a second pencil draws a larger copy.
Success check: Pantograph reproduces a recognizable scaled version of a simple shape.
Try changing: Pivot positions; linkage lengths; drawing scale.
Preparation: Pre-drill/punch consistent pivot holes and build a smooth-working example.
Lesson flow: Day 1: Linkage demo → assemble four-bar mechanism
Day 2: Calibrate pivot positions → trace test shapes → compare scale
Video:
Draw with a Pantograph - STEM Activity
Safety and cleanup: Teacher handles drilling/cutting; secure pivots; keep pencil points controlled.
https://youtu.be/M0eTiAE3gI0