TechnicBrickPower

Eurobricks Citizen
  • Content Count

    152
  • Joined

  • Last visited

2 Followers

About TechnicBrickPower

Spam Prevention

  • What is favorite LEGO theme? (we need this info to prevent spam)
    Technic
  • Which LEGO set did you recently purchase or build?
    Rough Terrain Crane

Profile Information

  • Gender
    Male
  • Location
    New Zealand
  • Interests
    Lego Technic, Lego Technic MOC, Lego Technic Cranes

Extra

  • Country
    New Zealand

Recent Profile Visitors

1517 profile views
  1. 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 between two gearboxes - one made from a stack of 3 of the original 12 and 20 tooth gears to create a 27 to 125 gearing ratio, and a similar version made from the new flat 12 and 20 tooth gears. The gear box losses are measured using a powered up motor and a powered up App to determined the efficiency of each gear box by lifting different weights. The results are presented and compared for each gearbox.
  2. Hi Everyone Merry Christmas! This is my Table Tennis robot demonstration. The table tennis robot can launch balls at up to 10 m/s using two buggy motors driving a pair of 46mm wheels. The ball baskets holds up to 60 balls that can be fired at the player at an adjustable rate of between 1 ball per second to 1 ball every 3 seconds. The firing angle is adjustable between 15 and 45 degrees using the buwizz 3.0 pro and application on an android tablet. The robot can produce topspin or backspin depending on the relative speed of the ball launch wheels. The robot is demonstrated on a table tennis table in backhand mode.
  3. Here I present an online program I have written for generating loops out of Lego elbow pieces. Elbow pieces (part #25214) are used in many Lego Technic models as a decorative part to create tube like structures. With this program you can search for loops within different sized spaces and set the number of elbow pieces to be used. It supports both loops and dual axle mounted solutions. You can download your solution as an .ldr file. Can you find a record number of elbows to fit into a space? To try the program go to (desktop browsers only): https://technicbrickpower.com/tools/technic_elbow_art
  4. Hi Everyone, Here I describe a method for measuring the efficiency of a gearbox using the Lego Technic Powered Up hub (Control+) and a motor to lift a weight. 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. Gearbox losses are due to friction within gears and axles rubbing on the liftarms. By measuring these losses gearbox designs can be tested and improved. Efficiency values are calculated and shown for several gearing combinations and for an automatic gearbox design.
  5. Hi Miha - yes of course no problem to use the animations ;) Credit would be appreciated to get a bit more traffic LOL.
  6. Oh hi yes it is. Should I have just added that to the original post?
  7. Hi All, I have updated my gearing ratio tool to support underconstrained differentials, i.e. differentials with 1 or more degrees of freedom - and it will show all of the underconstrained parts in orange/yellow. If you connect more than two motors it will show the gearing ratios of the other parts in the system as weighted sums of the motor speeds. The tool can be accessed here (desktop browsers). https://technicbrickpower.com/tools/gearing_ratio_calculator
  8. Hi @Philo, Sorry I didn't see your replay until today...Thanks for those two points - 35185 works ok for exports from Studio, so how do I know what the orientation should be for part 35185 for the .ldr that you have used? Does your file import correctly into Studio? Rotary catch is on my future list...lol
  9. This video presents a revised version of an earlier Lego Technic Powered Up 3 speed automatic gearbox that I created. 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 many viewers have pointed out, it is possible to simply use the main motor speed measurement to infer the torque on that motor simply through the inverse linear relationship between the motor speed and it's load or torque. This saves the entire torque measurement portion of the gearbox resulting in a more compact and robust design. I also discuss the optimal gear switching points based on the gearing ratio R between the higher and lower gear. Thanks to philo (https://www.philohome.com/) for the torque vs speed graphs for the powered up motors.
  10. Hi @nerdzforprez & @1963maniac. That's a great idea - I will add it to my long to do list. Will be useful especially for gear switching analysis. I used the threejs library for the 3d rendering - amazing library btw. Hi David, Thanks for your feedback, much appreciated. On point 4. Can you give me a part example? Universal joints are quite tricky as they move in a way I didn't know about! Point 5. I can make it drive one other part from an axle that is ok, e.g. the 3L, 4L liftarms etc. It's when you get into multi part constructions that it becomes tricky because the tool would need to know so many more parts and know how they connect and then it would need to deal with collisions with other static parts or other moving parts. Hi @GerritvdG - thanks yes chains and tracks are on my list - they are quite different to gears of course with quite a different motion - but will be interesting to try and code that!
  11. Hi Everyone, I have been spending some time building a gearing ratio calculation 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 only shows and supports Lego Technic parts related to gearing systems such as axles, gears, differentials, driving rings and worm gears etc. All other parts are now shown. Here's a video about it. Hope you might find it useful for your next project.
  12. TechnicBrickPower

    Powered Up 3 Speed Auto Gearbox

    Hi Andman, Thanks for your great suggestion and code blocks - it's something I totally didn't think about or realize was a possibility - I have come to Powered Up from a Power Functions upbringing! LOL
  13. TechnicBrickPower

    Powered Up 3 Speed Auto Gearbox

    Hi Zerobricks. Thanks mate that is a great suggestion - I had tunnel vision with my solution - I think that will work very well and will solve a few issues that I had tuning the torque measurement system. Look forward to trying that idea. Cheers!
  14. The lego Powered Up motors and functions have been used to create a 3 speed automatic gearbox. With the Powered Up functions you can accurately control motor speed and motor position, as well as being able to measure the angular position of a motor. These new possibilities have been used to create a three speed automatic gearbox. One motor is used to measure the torque at the output of the gearbox by detecting the rotation of an output differential; another motor is used to accurately set the position of an orange rotary catch controlling the switching between three forward gears, and finally one large powered up motor is used to drive the gearbox. The gearbox implements 3 forward speeds at gearing ratios of 1 to 1, 1 to 0.6 and 1 to 0.2 as well as one manual reverse gear. The Powered Up app has been used to program the gearbox controller on an iphone. Thanks to (racingbrick.com) for providing a great guide to all of the available programming blocks. Hope you enjoy this video. https://youtu.be/CRkvFffDef8
  15. Hi there everyone - here's a video I did recently. This Lego Technic project was to design a demonstration unit for the Fantom Wallet - a slimline wallet for holding credit cards. The mechanism opens and closes the wallet uses a 4 state cycle based on an earlier design of a 4 state multi-function gearbox (https://youtu.be/AdWiViLtmdk) that switches between two outputs using the reverse directions of the motor for state changes. That gearbox drives one output at a time in either the forward or reverse direction which was exactly needed for the Fantom Wallet opener. One output drives the opening mechanism and the other output drives the closing mechanism. In the opener the states are driven by the orange rotary catch component and changed by one length 2 liftarm driving another and using a 90 degree stepper.