# LEGO Technic drawing machine with a worm gear

A LEGO Technic spirograph machine driven by one motor, a worm gear and a crank, with no code. A turntable spins the paper while a swinging pen arm draws a dense flower pattern.

- Category: Hardware (build)
- Made by: [Brick Trials](https://youtu.be/tbUF2owb10w) on YouTube
- Original: https://youtu.be/tbUF2owb10w
- On Afterware: https://afterware.xyz/p/lego-technic-drawing-machine-with-a-worm-gear

## Can I build this?

- Difficulty: Intermediate
- AI-buildability: 2/5 (The design is mechanical, so the hard part is gear ratios and physical assembly rather than software.)
- Parts: LEGO Technic parts, worm gear, motor

Estimates based on the original write-up.

## Build sheet

- Base: LEGO Technic
- Drive: Single motor, worm gear
- Motion: Turntable plus crank arm
- Code: None

## Story

The machine uses a single motor to drive two mechanisms: a turntable that spins the paper and a crank that swings the pen arm. The two rotation speeds are slightly out of step, so each stroke lands a few degrees further around the paper. Over about three minutes the drift builds a dense spirograph flower.

The build is made entirely from LEGO Technic parts and runs without any electronics or code. The source describes it as a single motor, a worm gear, a crank and nothing else.

The maker shared a 4K video of the full build with recorded brick sounds, followed by footage of the machine drawing.

## Resources

- [Build video](https://youtu.be/tbUF2owb10w)

Tags: lego technic, drawing machine, spirograph, worm gear, no code, single motor

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