Subject:
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Re: Motion considerations when RCXing The Improved and New Old Miller Gustav's Post Mill
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Newsgroups:
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lugnet.castle, lugnet.technic
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Date:
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Tue, 3 Feb 2004 14:06:54 GMT
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Viewed:
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777 times
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In lugnet.castle, Tobbe Arnesson wrote:
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Getting a powered axle through a turntable is a non-issue.
Getting two through it is another thing, although not hard to do.
I think the best implementation of such a device is in Jennifer Clark’s fine
JCB:
http://www.genuinemodels.com/jcb.htm
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I’ve never seen that arrangement before, but it’s impressive. I don’t have the
gears and clutches for that. I’ve tried a crude version locking differential
boxes together, and driving off the gears on the ends though.
Okay, two ways to get a simple two-shaft concentric drive:
The first is, as mentioned above, use a technic turntable, driven by a pinion on
the outer rack, to turn the main body of your mill. Then, drive the sails with
a shaft right up the centre of the turntable.
The more compact version is to have a central drive shaft for the sails, and
drop a dark grey technic freewheel gear over it, again as mentioned above. Put
a technic 1x4 plate (the steering plate with holes in the ends) on top of it, to
lock into the crown, then press a technic 2x8 plate down on top of that. Drive
the gear with a worm gear placed just low enough for the plates to turn freely
on the shaft.
My mill on the NBLTC layout:
Uses the technic turntable method. It can turn right round under remote
control. There’s also a pinion gear that picks up the drive from the inner
track of the turntable, and uses a chain drive to spin the tail of the windmill
as the head turns.
Jason Railton
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