, 
, 
). In my opinion techlug.fr is strongest technic community, I visited it regulary for a long time, usually looked images, shame on me I've realized that I able to read too just now, google translates franch to english pretty well, so feel free to write commens in french.
I suppose all of you know how lego technic team makes mid-size motorized model control, two switches are needed to control each function: first switch attaches function to a motor and second switch chooses motor rotation direction. If this approach annoy you as it annoy me then model below may be interesting for you.
I had the following requirenments
- Model should be as compact as it is possible.
- Powered with one motor
- Any boom section should be controlled independently with its own linear actuator
- Any function (boom section) should be controlled with one switch.
There was no specific real excavator model I inspired with. Design was size driven.
So let's start with exterior photos.
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The following photos show gear box design, please let me know if explanations are needed.
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All photos on yandex
Thank you for reading, and thanks to lego, cool new parts made this model possible.
Update 1. Gearing (is made in LDD, that's why boom is not included).
Yellow moves boom up and down, green controls arm and red is for bucket.
Update 2. Video
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