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!

Lego Technic MOC Programmable Controller

5 May 2020

Here I present a Lego Technic MOC programmable controller to control two independent Lego Technic functions simultaneously. The controller uses two tank tracks with pins on them to select between neutral, forward and reverse to control a small crane. The timing of the switching can be controlled by the placement of the pins on each track in effect allowing you to program the timing sequence. The example crane can follow a sequence such as hook up, rotate clockwise, hook down, hook up, rotate anti-clockwise etc. The tracks have 40 segments each to allow up to 40 different timing options, however these can be extended as required.

More to explore

Lego Technic MOC Timer Gadget

25 Apr 2020

An unconventional Lego Technic MOC timer gadget is presented. It is based on 4 pins holding back a liftarm that stops the timer. Each pin is motor driven by a different gearing ratio such that the liftarm can only move once all pins align. This only happens when the number of turns of the main ax...read more

Lego Technic Powered Up 3 Speed Automatic gearbox 2

24 Jul 2021

This video presents a revised version of an earlier Lego Technic Powered Up 3 speed automatic gearbox. The previous gearbox used a differential for torque measurement and used a powered up large motor to convert the differential rotation into a torque measurement.

However as it turns out ...read more

1000 Speed Lego Technic MOC Gearbox

20 May 2020

Here I present a Lego Technic MOC gearbox with 1,000 different speeds. This is not a sequential gearbox, instead the gearing ratios are selected using 10 switching levers each of which adds a power of 2 to the overall output gearing ratio. A down gearing of 1000 to 1024 at the end of the gearbox ...read more

Lego Technic MOC 256 Speed Gearbox

18 Apr 2020

 

Here I present a 256 speed gearbox controlled by 8 switches. This design is based on a 2 differential N to P gear ratio design presented in one of my other videos. The gearbox allows 256 different gearing ratios to be selected including 1:44, 1:34, 1:33, 1:32, 1:28, 1:27, 1:24, 1:2...read more

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

27 Mar 2020

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.

...read more

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

Lego Technic Pi Day Machine

14 Mar 2022

 

Here I present a Pi Day special Lego Technic machine that produces a gearing ratio of Pi/8 using a 56mm wheel driving a 13x13 square wheel.

The correctness of the ratio is confirmed by matching it with output of a 2 differential gearing system that produces a ratio of 355/9...read more

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

Lego Technic Powered Up 3 Speed Automatic Car

14 Aug 2021

 

This video presents a new lego technic 3 speed automatic RC car. The gearbox uses the lego technic powered up hub and 3 motors to drive, steer and switch gears. The car's 3 speed automatic gearbox has 3 forward speeds with gear ratios 1:1, 3:5 and 1:5 and has been programmed us...read more