Gearing Ratio Calculator

Check out the Beta version my Lego Technic Gearing Ratio Calculator Tool:

This tool allows you to upload your Lego Technic project .ldr file and analyse the gearing ratios between any two connected gears or axles. Currently supports most gears, axles, worm gears, some differentials, cv joints and universal joints. See the video tutorial on how to use it. It is a work in progress and I would love to hear your feedback on it. Click here to try it out.

Note: As of 25 Septemeber 2021 the tool supports CV joints, linear speed via the radius of the component and improves on the frame rate for higher numbers of parts in a model).

Technic Elbow Art

This is a tool to create "Lego Technic Elbow Art" - a series of intertwined elbow pieces as a single sequence. Choose your dimensions and search parameters and search for new dense solutions and set a record! 

Download your Elbow Art as an .ldr file and build it yourself. Click here to try it out!

Lego Technic MOC Combination Lock Safe. Keep your Lego SECURE!

2 Apr 2020


Here I present my Lego Technic MOC combination lock safe. It has four 8 letter word reels and can make 4096 combinations, 522 of which are actual English words - including the word "lego"! You can change the combination lock code using adjustable liftable gears hidden under a double bottom floor of the safe area. Have fun guessing the combination set by someone else - the spring lock will pop open if you get it right. Secure your precious lego pieces in this safe (or better yet use a real safe).

More to explore

Spirograph Machine

19 Dec 2023
Spirograph Machine

Here I present a Lego Technic Spirograph machine programmed using Powered Up. The powered up controller is used to maintain the desired gearing ratio between the turn table and the inner gear to draw a spirograph that replicates the real original spirograph drawing toy. more

Lego Technic 1,000,000,000 to one gearing MOC

27 Mar 2020
Lego Technic 1,000,000,000 to one gearing MOC

This Lego Technic MOC has over a billion to 1 gearing ratio. It is designed to resemble an architectural tower structure. I measure the input speed of over 3000 RPM using a digital tachometer and calculate the rate of rotation of the tower top to be about 222 days per rotation. more

Lego Technic MOC 63 Speed Gearbox, including reverse!

5 Mar 2020
Lego Technic MOC 63 Speed Gearbox, including reverse!


Here I demonstrate a 63 speed selectable gear box using 6 selectors. The gearbox implements all gear ratios from -32:1 to 31:1. Five differentials are used for this design. Interestingly it has trouble when inverting the input and outputs. The build instructions for this lego more