Hello everyone. I would like to introduce my truck with excavator. It is loosely based on Tatra 815 with UDS 114 (universal finishing machine). The real thing looks like this:

I really like this type of excavator, its main advantage is high mobility because it can even go on highway. It is mainly used on road building and terrain shaping.

 

My goal was to make pneumaticly operated truck, preferably playable by kids. I started with some blueprints and decided to use 49,5mm wheels that set my scale to roughly 21,5:1. I wanted it to look like an older truck, with low cabin and boxy design. The model features:

- HOG steering by spare wheel at the back of cabin

- Openable doors with decent details in interier

- Fake V4 engine that is connected to rear axles, each with differential and with shock absorbers (~1 stud travel distance)

- Pendular unsprung front axle with ackerman steering (~3 studs travel distance)

- Pneumatic stabilizers that are able to lift the whole truck

- Pneumatic jib with manual extension from ~40 to 68 studs

- Manually operated bucket with 360° rotation

The above is a result of many compromises - like V4 engine instead of inline 6 etc. It is not possible to fit larger engine into this scale, I tried mini fake engine but I didn't liked how it looks. What is most satisfying for me is the front axle with ackerman steering and pivot point nearly in center of the wheel. That allowed me to build very nice fenders close to wheel. The wheel doesn't touch it even in full turn radius and fully compressed. The rear axles are by Efferman, he used this design in his Kenworth crane. I really like it. Enough talk, some pictures:

IMGP4963 by Ivan Moc, on Flickr

IMGP4964 by Ivan Moc, on Flickr

IMGP4965 by Ivan Moc, on Flickr

IMGP4966 by Ivan Moc, on Flickr

IMGP4968 by Ivan Moc, on Flickr

IMGP4969 by Ivan Moc, on Flickr

IMGP4970 by Ivan Moc, on Flickr

IMGP4971 by Ivan Moc, on Flickr

IMGP4973 by Ivan Moc, on Flickr

IMGP4974 by Ivan Moc, on Flickr

The weight of the fully extended jib is pushing the thin pneumatic cylinders to their limit. I wanted to keep thin ones at all cost because they look much better. I have redid the jib like 15 times, ending with studded one that prooved the best abilities in terms of rigidity, weight and looks. The battery box is there as counterweigh only. I had several versions with PF - to run compressor (not enough pressure to lift fully extended jib), motorized jib extension (took too much space from the extension),.. so in the end I threw PF out, leaving all functions as manual. The stabilizers were also quite challanging due to the angle and size, at least they have no problem lifting whole truck. I hope you like it.

 

 

Edited April 24, 20177 yr by Ivan_M
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Looks very nice :)

Very nice job! I'd love a video of this :)

Excellent truck, the functions are great. I really like the outriggers.  How are they anchored securely?

Now this should be a an Official set,.. 

Love the way it looks, and love all the functions.

Nice MOC! proportions are well captured. Especially, solution of steering with ackerman geometry is cool, and combine with suspension in this small scale, great job!    I like small (or medium) functional models.

i really like the colour combination. Functions seems to be great too, but seeing them in motion, it would be the best. :)

Great model. Nice colors and outriggers. Please make a video

A lot of functions in such a tight space. Looks great but we still need a video. The front reminds me of Erik leppen's mini crane truck if you may know it. I'll be excitedly waiting to see it roll.

I have made video:

 

It is such a pain to make video of manual model, but I think you can get hold of all major features from it.

I have made a .io file for stud.io so everyone can build it. You can download it here:

https://drive.google.com/file/d/0B_52o8Yjx1kuZTU3QS0zQjdJaVU/view?usp=sharing

I have discoveder during dissassembly that whole build would benefit from many optimalizations - the excavator base is just bunch of liftarms, the backbone of the truck is quite complicated too without reason (and better bracing as well). But I want to move on to another project, once I consider build "finished" I cannot work on it anymore as I have already full mind of upcoming project. i will also put it on rebrickable so you can check inventory (approx. 1850 parts).

Tatra 815 by Ivan Moc, on Flickr

Edited April 24, 20177 yr by Ivan_M

Excellent model at this size

An impressive amount of functions for sucha small scale. I really like the use of the spare wheel for the HOG steering. Very cool work!

Hello Ivan!

Your MOC inspired me to make this, the actual thing!

Thanks :)

Cool, it is very exciting to see people inspired by it, good work!