TOOLS

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!

What is a gearing ratio?

15 Aug 2021

A gearing ratio measures the ratio of the output speed to the input speed of a geared system. So if the output axle makes 1 rotation per second and the input axle makes 3 rotations per second then the gearing ratio is 1 to 3 or 1/3 which is also written as 1:3. Given a pair of gears you can calculate the gearing ratio as simply the number of teeth on the driving gear divided by the number of teeth on the gear being driven. For example below is an image of an 8 tooth lego gear driving a 24 tooth gear. The gearing ratio is 1/3 as the input axle (red) will rotate 3 times for each rotation of the output axle (yellow).

Lego Technic 1/3 gearing ratio

More to explore

New Flat 12/20 Gear Friction

23 Apr 2022

The Lego Technic set 42140 App-Controlled Transformation Vehicle introduces two new gears - a flat version of the 12 tooth bevel gear and a flat version of the 20 tooth bevel gear. These gears are designed to have less friction.

In this video I measure the difference in gearing efficiency...read more

Gearing Ratio Calculator Tool Help

26 Feb 2022

Measuring Gearbox Efficiency

6 Nov 2021

This video describes a method for measuring the efficiency of a gearbox using the Lego Technic Powered Up hub. Gearbox efficiency is defined as the ratio of the output power to the input power and here I show how to measure each of these values to allow you to calculate the overall efficiency.read more

How do you make a 1:N gearing ratio?

31 Oct 2021

Lego Technic Gearing Ratio Tool Update

4 Sep 2021

This video presents updates to the Technic Brick Power Lego Technic Gearing Ratio Calculator tool specifically on underconstrained differential systems. These are systems in which the differentials are not fully constrained and therefore have 1 or more degrees of freedom within them.

The ...read more

Lego Technic Gearing Ratio Calculator Tool

16 Jul 2021

Here I present my new Lego Technic Gearing Ratio Calculator tool. This tool allows you to upload your Lego Technic .ldr (Lego Draw) file and it will simulate the gearing system and visualize it as well as showing the gearing ratios relative to the input component.

The tool can be accessed...read more