# Lego Technic Gear Meshing Angle Tutorial - how to calculate gear angles

This video presents a Lego Technic tutorial for calculating the gear angle for the correct meshing of the lego gears within a lego design program such as bricklink studio. Three lego gear meshing examples are working through - the first one being a straightforward rotation of the second gear in order to mesh with the first gear which is set to zero degrees. In the second example the first gear as an arbitrary angle of rotation and the correct angle calculation of the second lego gear is demonstrated by using the angle combined with the gearing ratio between the two gears. Each of the first two examples assumed the relative position of the second lego gear is at a multiple of 90 degrees. In the third example the position of the 2nd gear is at an angle relative to the first and again the correct meshing angle is calculated. All of the examples are working through on the bricklink studio lego designer program. The examples are applicable to other programs such as lego's LDD design program.

# More to explore

## New Flat 12/20 Gear Friction

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

## Measuring Gearbox Efficiency

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 Gearing Ratio Tool Update

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

## How to mesh any two Lego gears on a regular grid!

In this video I analyze all of the eight regular lego technic gears and demonstrate how any two of them can be meshed on a lego grid.

A sum of radii chart is used to determine the possible diagonal meshing combinations. These are then combined with "intermediate" or "idler&...read more

## Lego Technic PU 2 Speed Automatic Gearbox

This video presents a lego technic two speed automatic gearbox using two motors and the Powered Up (PU) lego technic control system. Each motor uses a pivoting gear to either connect to it's gear to the left when rotating in the forward direction or to the gear to the right when reversing. Th...read more

## Lego Technic Pi Day Machine

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

### How do you make a 1:N gearing ratio?

### How do you make a 1:3 gearing ratio?

### What is a gearing ratio?

## Lego Technic Gearing Ratio Calculator Tool

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