Compact Tracked Loader
A compact tracked loader featured powered tread, raised and tilted bucket with dual pivot boom in very small volume. With building instructions.
After making my last creation (Leaning Tricycle) using Buwizz, I wanted to re-test sbrick, as it never worked for me and my google phone since I have. And I was surprised that the dev team have made a update and it finally works on my asus phone ! So I would like to make a little creation to test it.
The idea was at first to build a small 4 motors creations to be controlled by the buwizz. But I do not want to make an other crawler or wheeled loader, so I add the challenge to make the smallest crawler loader I can.
The tracked loaded is build using only M motor for the small size. 2 Of them are located in the chassis underneath the cabin and drive each track with 12/20t and 8/24 gearing ensuring a good speed with accurate control. Note on this picture that I have placed the battery box upside down in order to fit the wire.
The lifting of the boom is powered by a M-motor placed behind the drivetrain. It operates two linear actuators. Note that the model of inspiration was the John Deere 323 who has a interesting boom mechanism, composed of 2 links which differs from the classic Bobcat mechanism wich long rod. This mechanism enables here to have better travel for the bucket but also a better force repartition. In deed the load tends to pull the connecting rod in steel instead of the actuators. Here is in lego enables to have compact solutions and high travel.
The tilting of the bucket is at least powered by a M-Motor which drives a small linear actuator on the righ side. Then a system of lever and connecting rod ensuring the tilting of the bucket. At the begining I use worm screw and 8t gearing for tilting the bucket which was a more compact solution but was too fast and not accurate. Therefore this solution is a bit less compact but still have a better accuracy of position which is better for playbility.
To conclude, this moc is very compact and playable, with 4 functions in it, this is one of the smallest tracked loader in lego. I use lipo battery with sbrick, but this is also compatible with classic IR receiver (need 2 and there is enough room in the cab) or the buwizz instead of sbrick plus lego battery box. This model is not equipped with light but you can easily add it.
Buy this creation
You can now buy this creation from mochub, you will receive the parts and the instructions as PDF.
Please note that this version is equipped with 4 motors, but no battery box, neither command module. You have to choose between 3 solutions and buy the parts needed by your own in consequence :
– Buy a lipo battery from lego + Electric charger from Lego + 1x wire extension 20cm (available also on the LegoshopAtHome) + 1x sbrick (third party parts). You will need a smartphone to control the sbricks (see required smartphone here). Average Cost : 170$
Either solutions are plug and play on the crawler loader. All parts for mounting the battery and receiver are included no matter which solutions do you choose.
After making this small moc, I wanted to make the instructions in order to enable you to rebuild it because this is a good moc to play, one of the smallest loader and can be equipped with sbrick or buwizz or lego Ipower functions solutions. I have created consequently two building instructions. One for sale at 5€ with pro looking (like the official lego one), and one for free based on detail photo sequence. Therefore, you can buy it to support me, or just watch it for free, as you want.
Here is the complete bill of material in picture file :
But you can also checked it on rebrickable :
By using the next up paypal button, you will get the pro-building instruction in PDF for 5€.