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 Relative Friction Measurement - who will win?
The relative friction of four different Lego Technic solutions for transferring motion from one axle to a far away axle are compared. The friction load differences are compared using a lego technic differential to measure the speed difference of the load on two lego medium motors.
The four motion transfer solutions that are compared are a series of nine 16 teeth gears, three 40 teeth gears, a chain, and bevel gears driving a perpendicular axle. Who will win this comparison competition?
More to explore
Gearing Ratio Calculator Tool Help
Lego Technic torque in practice - how to work with torque in automatic gearbox design
n this video I present a ten level Lego Technic torque creation gadget for testing lego power function motors and automatic gear switching mechanisms. The effect of torque on a large lego PF motor is tested against the theoretical power curve to compare the optimal gear switching point in practic...read more
Lego Technic 3 Speed Automatic Gearbox
Here a Lego Technic 3 speed automatic gearbox is presented. The gearbox automatically switches between one of 3 gear ratios, namely a ratio of 1, 1/3rd and 1/9th depending on the load on the output. It uses two 2 speed automatic transmissions in series to create the three speed automatic ge...read more
Lego Technic New 12/20 Gear High Speed Friction Test
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 follow up video I measure the high speed difference ...read more
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
Lego Technic Applied Gearbox Theory Improved
This Lego Technic video demonstrates an improved design of a Lego technic 2 speed automatic gearbox based on a theoretical approach. Typically a Lego automatic gearbox consists of two stages namely a gear selector and a torque detector. In this video, both of these components are improved upon.read more
Lego Technic Optimal Gear Switching Ratios
This video presents the relationship between lego technic motor torque and speed and shows there is an peak power for each electric motor.
The peak power is calculated and a formula presented relating the power operating point as a percentage of peak power. From this an operational power ...read more
Lego 2 speed automatic car. Part 1
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 Automatic Gearbox - Compact! With build Instructions.
Here I present a design for a compact lego technic 2 speed automatic gearbox. Instead of using a differential to react to torque on the output it uses the force on the gear teeth to push a liftarm to automatically change the gearing ratio to the 2nd speed once the torque threshold has been ...read more
How to measure a Lego Technic Crane's Efficiency. The results surprised me!
Here I demonstrate how to measure the efficiency of a Lego Technic MOC crane using basic physics. Efficiency is the ratio of the useful energy output (the potential energy put added to the weight) the to the input energy (power source power). The efficiency curve is interesting and does not look ...read more