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About TechnicBrickPower

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    Rough Terrain Crane

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    New Zealand
  • Interests
    Lego Technic, Lego Technic MOC, Lego Technic Cranes


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    New Zealand

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  1. TechnicBrickPower

    Single Motor RC Tank

    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.
  2. TechnicBrickPower

    [MOC] Really Useless Controller (which controls itself)

    This is great - I don't think it's a joke!
  3. TechnicBrickPower

    PI DAY Build - A Binary Expansion of Pi

    Hi @Captainowie, thanks for your reply. Hey yeah wow what you built is awesome - am still trying to figure out how it works...Is it really Pi:2? I didn't think that would be possible but you've done it. Thanks for sharing. What I am going to do next year for Pi Day!!? Also where I live it's mathz.
  4. TechnicBrickPower

    Multi Function Gearbox using a single motor MOC

    Hi @m2fel - yes a few other people have commented that one of the official lego sets implemented two functions on 1 motor. Yes torque is no problem - the swinging arm gets pulled towards the gear with higher torque so no never skips. You can stall the motor by holding the output.
  5. Hi there, this multi function gearbox implements two separate functions using just a single motor. It implements the two functions by exploiting the direction of rotation of the motor and implementing one function for the forward direction and a function selector in the reverse direction. The reverse selector can be used to select between between driving one of the two outputs in either the forward or reverse direction. This means you can build a remote controlled car or device that has two functions that can be remotely controlled with just 1 motor and just 1 channel of your remote transmitter and receiver combination.
  6. This Pi Day model demonstrates how to approximate a gearing ratio of Pi by representing Pi as a binary number and using differentials arranged in a chain formation to create the binary representation. Each differential implements 1 binary digit. If the binary digit is zero the differential can be replaced by a gearing ratio of a half to reduce the number of differentials required. This model has 23 binary digits and approximates Pi to 7 significant figures, uses 202 gears and is driven by a median PF motor.
  7. TechnicBrickPower

    Dual Function Gearbox

    Hi Everyone, I have just created a video about my dual function gearbox allowing you to remotely drive and change gears using just one motor - i.e. the one motor implements two functions. The gearbox implements two functions at once by exploiting the direction of rotation of the driving motor and implementing one function (driving) for the forward direction and gear changing in the reverse direction.
  8. Hi all, This 2 speed automatic gearbox implements it's second gear by using a two degrees of freedom configuration and blocking and unblocking the lower gearing ratio path by using a switch and rotary catch. The rotary catch is driven by a torque detector and once enough load is detected at the output it is rotated 90 degrees to unblock the low gearing ratio path. Upon the path being unblocked it becomes the path of least resistance and the output gearing ratio is reduced to give a higher output torque. Alternative lower gearing ratios can be implemented in this by changing out the lower gearing path gears. This gearbox operates in a bi-directional manner - meaning the input motor can rotate either way and the automatic gearbox still functions.
  9. Here's my 3 speed automatic gearbox using a servo motor to drive the gear change mechanism. The servo motor is activated by an electric switch which in turn is driven by a torque detector using a differential at the output. The automatic gearbox will switch to a lower gears automatically as load is detected on the output of the gearbox allowing it to generate more torque to overcome the load.
  10. This video shows the design and demonstration of an 8 speed manual gearbox inspired by the Lego Ferrari 488 GTE model that has come out in 2021. The gearbox gearing ratios closely approximate the gearing ratios of the real Ferrari 488 GTE gearbox except that I have implemented it as a manual 8 speed gearbox instead of an automatic gearbox. Hope you like it.
  11. An improved version of my RC 3 speed gearbox is implemented into a remote control car. This video shows three main improvements over the previous gearbox design. The first is an improvement is to replace the 90 degree bugatti stepper with a PF servo motor reducing the gearbox complexity. The 2nd improvement is to use a gear rack to replace the liftarm lever mechanism for converting angle to linear displacements. And finally the third improvement to change from using a 2 lego unit axle offset to a 2+1 offset to allow bevel gears to mesh with regular gears for the gear switch mechanism, and thereby eliminating one row of gears. The final gearbox is implemented into a basic lego technic 3 speed remote controlled car that can be driven backward and forwards and steered remotely, as well as remote gear changing between 3 different speeds.
  12. Here I've created my first attempt at a RC 3 speed gearbox allows you to change gears up and down using a power functions remote control. The gear changing mechanism is implemented using two parallel axles each with gears arranged in such a way that shifting one of the axles to one of three possible positions meshes the gears with 3 different gearing ratios. The gearing ratios implemented are 3:5, 1:1 and 5:3. The gear shifting axle is controlled by a lever mechanism driven by the 4 state stepper from the bugatti chiron set. This mechanism in turn is driven by a medium power functions motor activated by the remote control. Hope you like it.
  13. TechnicBrickPower

    2 speed automatic car - Ramp Test

    Thanks everyone for their encouraging comments. Hope to keep ideas flowing!
  14. My 2 speed automatic gearbox is put to the test by incorporating it into a 2 speed automatic car. This gearbox implements a number of design principles aimed at improving the gearbox performance - namely of placing the torque detector on a separate path to the main gearing power path to reduce torque and power losses in the gearbox, and using gear disengagement to switch gears instead of gear engagement. A simple derivation is presented of the physics involved in driving up a ramp in order to determine the amount of additional torque required at the motor output to be able to overcome the gravity and the corresponding potential energy. The torque of a large power function motor is measured by measuring the output axle speed using a laser tachometer and relating that to the linear torque/speed relationship of the motor. These measurements are demonstrated for the car without any loading and with simple horizontal motion. Finally the car is put to the test by attempting to drive up a 40 degree ramp.
  15. TechnicBrickPower

    2 Speed automatic using wormgear for switching

    Hi I knew you'd like this one better ;) LOL. As you know most of my builds are just proof of concept ideas. Once I have settled on something that works well I'd look at laying it out for a specific purpose - e.g. vehicle etc. No it doesn't work in reverse - most cars only go forwards LOL! The new differential has 28 teeth on the housing - it's pretty much a regular 28 tooth bevel gear. It gives another design option which is what I like about it.