Sunday, February 9, 2014

Week TechVideo, 2014 #06 - Single motor excavator

It  looks the the release of 42006 Excavator and the year end, inspired several builders to come with some innovative thinking.

LEGO Technic official models which feature several functions, use to have a switch box to attach one or several motors to a set of selectable functions. Then the direction of each function also uses to be controlled directly on the battery box switch.
This is indeed not the most intuitive nor the easiest way to operate a machine most of the times, and it seems to be annoying some the Technic fans out there.

Then some guys came with the idea of having single motor driven models with a special designed switch box
which enables each function e both directions and extracts power from that single motor.
While this kind of operation is a lot easier and more intuitive, it also better represents the way that real construction machines are operated.

I leave you with one beauty and compact excavator by Yannmar from Russia (Saint-Petersbug), published about one month ago.

You may find the full set of pictures from this model and some LDD interns at Yandex.
Also some other great compact models by Yannmar from his Brickshelf gallery here.

Steph77 explored the same principle about one month before, using the same model as inspiration, a larger upper structure base but also controlling all the six functions from this model. Instead of the three main functions for the upper structure, as proposed by Yannmar.

This idea seems to be most suitable for small and compact models with few functions and it even seems to perform quite well while selecting more than one function simultaneously.
Although I'd like the videos to focus a bit more on this ability. I'm also wondering about the number of simultaneously running functions allowed, and how this escalates to larger models, bigger motors and more power demanding functions where torque demand and friction play a bigger role.

And coincidence or not, another guy (Arik) exploring the same concept (three upper structure functions) about the same time.


Please avoid sending requests to post specific models on this TBs section.

We understand some of you would enjoy to see your creations featured here, but please understand that because only one video gets highlighted per week, it is impossible to accommodate all the great MOCs continuously build by the Technic builders out there. They simply won't fit all and that's also not the purpose of this blog (see the header statement).

Many of your MOCs are scanned anyway and listed for later publication when they do not fit immediately. However some remain in the backlog queue just for too long and eventually loose the relevance or the publication opportunity window. As a rule of thumb, we also avoid publishing MOCs that have been featured by their authors or other fans at some other great web places dedicated to the Technic community out there. It doesn't mean that occasionally some won't get published here anyway.

Thanks for your understanding!


Radosław Śliwiński said...

Really clever models.

I love Steph77 version. I think it's inspired by 8043 set but in a new, fresh way.

Anyway, although this topic is about single motor solution, I like to share another great idea for EV3 version of 42006 found here:
and servo controlled multiplexer:

I NXTfied this model (in a much simpler way, Mindstorms NXT2, 3 motors) and this set really excels in motorised version.

Cheers, Radek

Kian Davhia said...

I'm not that familiar with cheap excavator attachments but know I do. This is in terms of proper use for them. Thanks!

Jon Victorino said...

Take my money, LEGO! All of it!

See my favorite LEGO builds

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