WR&N IV Animation: Functional N Scale Excavator

The single most challenging animation project I've attempted to date has been a functional excavator. Based on a heavily-modified GHQ kit, it features five degrees of motion. The actions are driven with low-RPM geared motors that move the parts though monofilament line. The model still exists, although it's gotten a bit cranky in its old age (much like its builder).

The controller also contains the power supply:

The device's operation is best understood through the following videos:

 
 
 

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