# 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!

# Lego Technic RC 3 SPEED CAR - change gears, drive and steer using remote control

19 Jan 2021

An improved version of a lego technic RC 3 speed gearbox is implemented into a remote control lego car. This video shows three main improvements over the previous gearbox design. The first is an improvement is to replace the 90 degree bugatti stepper  with a PF servo motor reducing the gearbox complexity. The 2nd improvement is to use a gear rack to replace the liftarm lever mechanism for converting angle to linear displacements. And finally the third improvement to change from using a 2 lego unit axle offset to a 2+1 offset to allow bevel gears to mesh with regular gears for the gear switch mechanism, and thereby eliminating one row of gears.

The final gearbox is implemented into a lego technic 3 speed remote controlled car that can be driven backward and forwards and steered remotely, as well as remote gear changing between 3 different speeds.

# More to explore

## LEGO Technic MOC: 1023 SPEED CAR

16 Jul 2020

A 1,023 speed gearbox has been built into a Lego Technic remote controlled car chassis. The car can be steered and driven via remote control using two channels. The gears can be manually changed using ten selectors that drive ten differentials. This allows for one of 1023 different speeds to be s...read more

## Lego 2 speed automatic car. Part 1

3 Oct 2020

This video explores the use of the lego technic "smoothly switching 2 speed automatic gearbox" inside of a test car to see how well it works to climb up a ramp.

The gearing ratio of the 2nd gear of the 2 speed automatic gearbox can be set using a manual 4 speed gearbox to choose...read more

## Lego Technic 2 Speed Auto Car Ramp Challenge - Part 2

10 Dec 2020

A lego technic 2 speed automatic gearbox is put to the test by incorporating it into a lego 2 speed automatic car.  This lego 2 speed automatic gearbox implements a number of design principles aimed at improving the gearbox performance - namely of placing the torque detector on a separate pa...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

## Lego Technic Single Motor Tank V2.0

1 May 2021

Here I present my second new and improved version of a lego technic tank that is driven by a single lego power functions motor. In this version the gearing mechanism has been optimized and far fewer gears are used to create the four different track direction combinations, namely both forward, bot...read more

## Lego Technic Single Motor Tank

1 Apr 2021

Here I present a lego technic tank driven by a single lego power functions motor. The lego RC tank can be controlled remotely using a single remote channel and driven forwards, backwards, and steered left and right. These functions are implemented by using a single large PF motor and exploiting t...read more

## Lego Technic RC 3 Speed Manual Gearbox

11 Jan 2021

A Lego Technic 3 speed remote controlled gearbox is presented with the design process explained. The lego RC 3 speed gearbox allows you to change gears up and down using a power functions remote control. The 3 speed gearbox implements the gear changing mechanism using two parallel axles each with...read more

## Lego RC car chassis with slow reverse gearing mechanism

8 Jul 2020

This Lego technic MOC car chassis is remote controlled with forward and reverse and remote controlled steering. What is different about this design is that it implements a special gearing mechanism that allows the car to drive forward at a normal speed, and 1/5 the speed in reverse. It uses a spe...read more

## Lego Technic Powerful 2 Speed Auto Gearbox

3 Jun 2022

Here I present my design for a compact and powerful Lego Technic 2 speed automatic gearbox.

The gearbox uses the Lego Technic Powered Up functions to detect speed and deduce torque from that to make gear switching decisions. The gearbox switches between a high gear of 1 to 4, to a low gea...read more

## Lego Technic Omni Directional Vehicle v2.0

11 Jun 2021

This is an improved version of the Lego Technic Omni Directional RC Vehicle v1.0 (https://youtu.be/crj3kOiSmHg). Several improvements are made in this model mainly around the mode switching from driving forwards and backwards to rotating on the spot. In the previous model there was a lot of gear ...read more