Forklift – Full RC – MOC

 Construction equipment, Global, MOC  Comments Off on Forklift – Full RC – MOC
Sep 252015

Hello all of you, Lego fans !
Forklift_1024Time has come for a new MOC, a from scratch MOC that kept me occupied for quite a long time. I was searching for a new idea and I saw a few forklifts on Rebrickable… the idea was here, building something big, strong and with a few nice mechanisms. I started by inspecting what the other builders made so far, and I realized that I’ve set myself into a challenge that I probably could not win 🙂

Instead of copying, I took a white paper sheet and made the list of the functions I would like to see on a forklift :

  • Raising and lowering of the forks, with the ability to lift loads
  • Steering by the rear wheels
  • Leaning forward and backward of the lifting arm
  • Adjustable forks, in terms of spacing
  • Adjustable forks, in terms of height

The other things to add, as a Lego Technic model were for me :

  • Hiding as much as possible the Power Function items
  • Building something that looks like a forklift
  • A working steering wheel. I hate when they don’t work !
  • Respecting the scale

Then went the time of the constraints. Will I be able to lift 1 kg ? not sure, the thing remains a toy made of light plastic pieces. Should I build it so it can raise a 1kg load ? Well, I probably could, but this would certainly have a huge impact on the look. So, a light load will suffice, for example, 2 or 3 wheels on a palette. Will I be able to motorize everything ? Is it necessary ? what are the functions that don’t need a motor without altering the playability ? Well, the forks can be adjusted once and, and the model still playable. What about counterweight… If I put a load on the front, I need a weight on the rear, and what’s heavier than the battery box ? nothing. Another good point of putting the battery box at the rear is that I will make it easily accessible, which eases its replacement.

Modularity ? Hum yes… but why ? What is modular on a forklift if not the forks ? And what to do… A possibility is to replace the forks by a tub. If you search on the web, you’ll find a few forklifts equipped with that, it’s usually used in the constructions sites to lift the cement or building materials on the scaffoldings. I’ll think about that later.. or not (it ended with a not haha)

The construction

I started by the forks, it’s the more interesting thing on the forklift. I built them a bit wide, with small wheels to reduce the strain when the forks touch the palette or the ground, when loading… To keep them symmetrical when being adjusted, I added a mechanism at their center. I also added pulleys to make them adjustable and simplify their attachment with the strings. Impossible to use chain there, i could not find how to tie them on the forks…

Then, I’ve made a chassis, integrating the motors and the battery box, and the 2 large actuators in charge of the leaning. The biggest challenge was to make it rigid enough without using hundreds of useless pieces. Once done, assembling the bodywork was the last step.
To be honest, the first release was almost all black and really ugly. Instead of making try after try to find a workable combo, I’ve drawn it under Lego Digital Designer and then played with the color tool until I made something that suited my wishes.

Finally, I’ve built something. Is it good or not, I dont know, but it’s playable, tested by a 7 years old kid ! That’s not that bad afterall, and I’m satisfied enough !
Watch the Youtube video if you want to see the demo, or download the PDF instructions below if you want to build it yourself !

Have fun with Lego !

Clic here for PDF instructions :  Forklikft - RC - MOC (4167 downloads)


42028 Bulldozer – Remote Controlled

 Alternate model, Construction equipment, MOC  Comments Off on 42028 Bulldozer – Remote Controlled
Sep 102015

Hi all, here we are for a new mod !

42028_A42028 is a nice small bulldozer with 2 functions, a blade on the front and a ripper on the rear. With its chains, it’s very realistic, but as usual with technic chains, totally unplayable on a smooth ground. The front blade is manoeuvrable thanks to the exhaust pipe. This is a good idea because it’s so much discreet than the traditional hand-of-god gears. The rear ripper has no real use, it’s just a mechanism added to complete the model, you can’t play with it at all, point.


42028-RC-RenderingMy son was playing with it, when i realized that it would be much more fun if it was fully remote controlled. I started with the tracks, the more elegant would have been to add a subtractor, but the lack of space led me to install two motors, one on each side and driving its own track. I chose to gear down a lot to increase torque, lowering speed, after all, this is a construction equipment, not a race car !
The front blade received also it’s own motor, and lots of gearing down, it’s heavy and the mechanism requires also lots of torque.

The main challenge was the battery box. Firstly I wanted to use a traditional PF battery, but it’s so huge that i could not find a place for it without altering severely the overall look of the bulldozer, mainly by modifying the cabin. Another point is that the new Lego tracks are wide and there’s not much space between them under the cabin.
I remembered then that my son has Lego trains, a quick raid in his bedroom and I stole him a battery box. They’re smaller, less powerful although, but smaller, which was the reason why I took it. I decided to install it in place of the ripper, it’s useless, so, let’s force ourselves to use it ! Another good reason to put it at the rear is that it equilibrates the weight of the bulldozer and improves the contact between the chains and the floor. Last thing, the 2 Power Function infrared receivers, the last free space was behind the cabin, it’s just wide enough, easy choice. This is not very handsome, but it’s my choice. Another possibility was to place them on each sides of the bulldozer, but the infrared signal is weak and I prefer to have them located high over the model than on its sides.

The rests of the modifications were more easy. The tracks are a bit shorter, 30 links instead of 32.

The summary of changes is as follows:
– Removal of the fake motor
– Removal of the rear ripper
– Adding of a motorization of the 2 tracks
– Adding of a motorization of the front blade

Instructions are available for free as a PDF file, you won’t need the original booklets and the part list is in the file. Feel free to download them, experiment and report your comments here !

>> Download :   42028 - RC - PDF (1755 downloads) <<