[MOC] Miniature combine harvester(possibly the smallest working technic combine harvester with 7 realistic functions )

[Auroralampinen]

Hi it's again the time when i strike back with a new moc:). 

 

This time I will show the newest member of the Soapbox collection. And the Soapbox collection flagship model. The miniature combine harvester:). 

 

(please note. I'm not an expert with agricultural machinery. And this is my first attempt to make a combine harvester. And I did a lot of searching on how combine harvesters work. But if you want to see more realistic combine harvesters, please check out @eric trax youtube channel. He is a living legend for agricultural machinery, https://youtube.com/@erictrax?si=pvuhm1bW33eMXklj :).). 

Free instructions:).

https://rebrickable.com/mocs/MOC-238324/Auroralampinen/miniature-combine-harvester/#details

Functions:).

 

Specs.

pieces 774.

Functions:).

Functions. 
Easily removable side panels for maintenance work,
Grain outlet can be operated by hand,
Openable Grain tank doors,
Right wheel drives blowers, 1 sylinder engine and straw outlet,
Left wheel drives the cutting blade/reel,
Cutting blade can be raised and lowered,
HOG steering for rear wheels.

Interior includes a simple blue seat:).

Pictures:).

Here are all of the Soapbox collection models:).

And yes, the harvester is builded on a smaller scale:).

Here is Miniature combine harvester next to a coke cherry can. For size comparison:).

 

If you made this far. Have a nice halloween:).

Edited October 15, 2025 by Auroralampinen

[Auroralampinen]

Here are some behind the scene design and building stuff:). 

Well, since this is the flagship model from the Soapbox collection line up. This has 58 pieces more than the dump truck:). 

And it's kind of fun to think that this model has 7 good quality functions. Even thought this is small. And yes, the functions needed a ton of engineering to make they work. And i did design this with functions in mind. So first camed the functions and then the looks:). 

And if you are wondering why this doesn't have a differential:). 

Well, i did build this first with a differential. But the raise and lower mechanism for the front blades didn't fit with the differential. So i decided to split the functions for both wheels to drive. And about the off set engine. It had to be made off center because othervise the cam would hit the HOG steering gear. So i had to engineer the engine off center to not cause any interfearance. And every square inch has been squeezed for functions. And the blue seat idea did came later. Because i first decided this would not have a seat. But after building and testing i noticed a seat would be possible to fit. So i did made a seat:). 

And one more fun fact of the Soapbox collection models:). 

They all start from the same chassis. All Soapbox collection models start with a flip flop beam, pins and connectors and 5.5L axle for the drive wheels:). 

Here is a picture of all of the Soapbox collection models chassis:).

Edited October 15, 2025 by Auroralampinen

[Auroralampinen]

Well, about the size. When i did build this i didn't think too much about the small size. But yesterday's evening i got a though that this might be the smallest working technic combine harvester with 7 functions. And i did look on rebrickable combine harvester moc's. And camed to the conclusion that this is the smallest one ever made. But if some one has made even smaller working combine harvester with these functions. Let me know i would be really intrested:). 

And fun fact about the side panels. The easily removable side panels did born from pure happy accident. I did build this with angled side panels and i did not think the removable side panels would be possible. Until afterwards i noticed they were easily removable just like on the real machine. And i was really proud of implenting this feature by accident:). 

[Auroralampinen]

UPDATE. Since this was my first ever moc with a chain i didn't know why it wasn't smoothly running. But now i did do a little bit of tinkering and now i got it running smoothly. And i have released fixed instructions for this:). 

 

[Auroralampinen]

Here are all of mine recent moc's. And the harvester is soo small next to the G500:). 

Ok, next to the G500 really shows how tiny the Miniature Combine Harvester is:).  

And funny thing is while the G500 is bigger then the harvester. It has only basic functions. Because it is based on 42213. So the functions are steering suspension RWD with V8, opening doors trunk, hood. While the combine harvester has a bucket load of unique functions, while being small. Functions. 

Easily removable side panels for maintenance work,

Grain outlet can be operated by hand,

Openable Grain tank doors,

Right wheel drives blowers, 1 sylinder engine and straw outlet,

Left wheel drives the cutting blade/reel,

Cutting blade can be raised and lowered,

HOG steering for rear  wheels.

So. I will continue invest my time with the Soapbox collection. It's really fun challenge to squeeze a bucket load of functions in a small model. Since lego doesn't make any fun to play small sets. Luckily then i come to rescue with the Soapbox collection. It's small but has a bucket load of functionality while lego does have only one good function and other being a bit lackluster. Like rear bucket and outriggers from the backhoe;). 

So Soapbox collection models go like this. 

The road roller is the most simplistic from all of the Soapbox collection models. 

Next comes the dump truck. Which has more functions and pieces than the lego dump truck which is a lot bigger than mine;).

Then comes the flagship the Miniature Combine Harvester, which is the crown jewel from the Soapbox collection. Again it has more pieces and functions than the Lego dump truck while being smaller;). 

[Auroralampinen]

Hmm, apparently the harvester is even smaller scale than the 30710 polybag:). 

[eric trax]

Great job! You've packed so many features into such a small model, which is admirable. It looks a bit bulky, but it's a good opportunity to work on future versions.

[Jurss]

Somehow missed this previously. Really great harvester. I really like these small, functional creations. Have also tried in this smaller directions, and somehow I like to build in smaller scale, than in larger.

[Paul B Technic]

I love the level of detail you have managed to get in to this, well done.