LEGO Technic Excavator Construction Toy 42055

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Nevertheless it's a very interesting machine to construct and operate and if you have the opportunity to build it for yourself I encourage you to so do. Perhaps you'll come up with some fixes for the other issues... I am therefore not able to wholeheartedly recommend this set: Personally I think it's pushing the boundaries of what's possible with Technic, particularly the Power Functions system, a bit too far and the model has suffered as a result.

Basically, as the conveyer moves an 'agitating plate' is raised when the 1x5 beams on the belt pass under its end, which then drops again once it has passed. This in turn causes three axles under the input chute, mounted at a slight angle and spaced to allow 1x1 rounds to pass through them but not the 2x2s, to move up and down/vibrate as well. The 2x2s travel on top of the axles to their exit on the left (in the photo below) while the 1x1 fall through to theirs, on the right. You can see the ends of the three axles in the picture above.It's somewhat front-heavy so there is a bit of a tilt on the body which results in the vertical frame not being exactly vertical. It doesn't seem to interfere with operation though. Note: I took the pictures outside in the garden this morning so they have a nice 'warm' tone to them.)

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Now, by this point the model has become so big that it no longer fits on my regular photography table so I was unable to take more photos until I had something bigger. The following pictures are therefore taken with different lighting in a different 'studio' and to be honest I am not that happy with them but hopefully they will serve to illustrate the finished model.