The excavator is my favorite of the three because of all the moving parts. I am truly grateful for 3D modeling systems. Without one I would not have been able to design all the moving parts so that they fit together without interference the first time. This is the only one that requires metal hardware. There are other ways of making the unit spin but lazy susan hardware seemed the most logical and easiest. I also had to pre-finish most of the parts. The best part of the excavator is there is a way to move the bucket. I was not all that pleased with the range of movement of the arm and bucket but I can pick up M&M's and dump them in the dump truck. That is good enough for me.
The assembly was not all that bad. I was worried about parts breaking or not lining up. It could not have come together easier. I am trying something on this. I hope it works but I do not know. There really was not a good way to glue in the dowels. So I cut the dowels 1/4" short and then filled in the space with glue. I am hoping this works, time will tell.
I felt that the excavator was a little small. So in the plans I grew the tread a quarter inch and made it wider by a half an inch. I think this will make it look bigger. I also changed the cab to look more like the dump truck. I was not really pleased with the set on top roof. These are reflected in the revised drawings and not on the prototype.
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