# Lego Technic MOC Trammel of Archimedes - "Do Nothing Machine"

Here I demonstrate a "Do Nothing Machine" also knows as a Trammel of Archimedes built out of Lego Technic. Although it is known as a do nothing machine you can in fact use it to draw an ellipse! In the second half of the video the mathematics are shown to prove the elliptical shape that can be drawn.

# More to explore

## Lego Technic MOC 256 Speed Gearbox

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

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## PI Day Lego Technic MOC using two lego differentials

Here I present a PI Day special Lego Technic MOC that produces a gearing ratio of the match constant PI to 6 decimal places. This is using two differentials to produce a gearing ratio of 355 to 113. Celebrate PI day 2020.

More details of how to design two differential Lego Technic gearing...read more

## 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 techn...read more

## 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

## Lego Technic 100 Part 4 Speed Gearbox

This video shows how to make a Lego Technic 4 Speed gearbox using 100 parts. The gearbox is a manual gearbox makes gearing ratios of 1/3, 5/9, 1/1 and 5/3.

The gearbox is demonstrated by hand and by using a Lego Technic Large Power functions motor.

...read more### Gearing Ratio Calculator Tool Help

## 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