TechnicBrickPower

Eurobricks Citizen
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About TechnicBrickPower

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  • 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

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  • Country
    New Zealand

Recent Profile Visitors

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  1. TechnicBrickPower

    New Technic Gear Ratio Calculator Tool

    Hi Miha - yes of course no problem to use the animations ;) Credit would be appreciated to get a bit more traffic LOL.
  2. TechnicBrickPower

    New Technic Gear Ratio Calculator Tool

    Oh hi yes it is. Should I have just added that to the original post?
  3. TechnicBrickPower

    New Technic Gear Ratio Calculator Tool

    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
  4. TechnicBrickPower

    New Technic Gear Ratio Calculator Tool

    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
  5. 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.
  6. TechnicBrickPower

    New Technic Gear Ratio Calculator Tool

    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!
  7. 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.
  8. 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
  9. 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!
  10. 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
  11. 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.
  12. Hi Everyone. Here I present my second new and improved version of a tank that is driven by a single 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, both reverse, one forward & one reverse (turn left), and the opposite to turn right. Also the motor has been upgraded to an XL power functions motor instead of the large power functions motor. This gives an extra 0.5 watts of peak power. The tank can be controlled remotely using a single remote channel and driven forwards, backwards, and steered left and right. These functions are implemented by exploiting the direction of rotation of the motor to either drive the tank or select one the four track functions. This is done by a swinging liftarm with a gear that connects the motor output to one of two separate axles - one for driving the tank and one for selecting the track functions. The track functions are built using 2 orange rotary catches to switch a gearbox design that allows both tracks to be selected to drive forwards or backwards or to drive in either of the two opposite directions for steering. The track function selector uses a 90 degree stepper and a knobbed wheel to drive the rotary catches. Enjoy.
  13. Hi Everyone, Here's a tutorial video I did on calculating the gear angle for the correct meshing of the lego gears within a lego design program such as bricklink studio. Three gear meshing examples are worked 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 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 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 designer program. Hope you find this useful.
  14. Hello Everyone. Here I present a RC tank driven by a single motor. The 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 the direction of rotation of the motor to either drive the tank or select one the four track functions. This is done by a swinging liftarm with a gear that connects the motor output to one of two separate axles - one for driving the tank and one for selecting the track functions. The track functions are built using 2 orange rotary catches to switch a gearbox design that allows both tracks to be selected to drive forwards or backwards or to drive in either of the two opposite directions for steering.
  15. This is great - I don't think it's a joke!