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QUESTION:In the July issue of Model Engineer there is a remote control model
of a Lieberr 984 excavator on page 27 , the model is made by a fellow
named N.Wilkinson.It appears to have functional hydraulics , I think
that this would make a great project to build. (and play with of coarse)
I have already designed a small hydraulic system but need to get it
smaller with any luck it should work , but need some more info. Do any
of you now this fellow,or have any ideas on where to get plans for a
excavator,or Demag shovel or O&K shovel?
Have any of you built a functional model like this "LIEBHERR 984"
If so any help would be great!!!
ANSWER: I can't help you with your quest for the model, but your post brought to the
surface a thought about scaling hydraulics. It appears to me that they don't
scale well. Since the force available from a hydraulic cylinder (at constant
pressure) is proportional to the area of the piston head, we have a square
law problem. In other words, scaling to half size gives us 1/4th the force,
scaling to 1/4th size gives us 1/16th the force, etc. Meanwhile, the model
loads may scale linearly (lever arm lengths, etc). So it would seem that
you'd fairly quickly get a machine which either wouldn't work, or would
have to have some parts built out of scale.
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