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.........Missed that animation first time round Chris but it shows well the motion of the bucket. In the labelled CAD picture you showed a couple of posts ago is there a bit missing that keeps the boom rack in mesh with the gear - in some of the videos some of the shovals seemed to have a hoop over the boom to control the gear mesh. This bit;
Ah ha! Very neatly placed in the center. Nice.Pete
So it seems that the dipper can be moved to either side of the boom, and that's the reason for the two pulleys?
My bad. Didn't realize the dipper was split down the middle from looking at your drawing.
Very impressive work Chris At that size it is almost capable of performing real work.