Subject:
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Re: Two Design Problems
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Newsgroups:
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lugnet.build
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Date:
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Tue, 7 Nov 2000 13:15:28 GMT
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Viewed:
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427 times
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In lugnet.build, Doug Dropeskey writes:
> I am having a hard time solving two design problems related to the base I am
> building.
> -D
> I am: Damraska@Excite.com
> Minifig Suns: http://pages.prodigy.net/damraska/
Problem 1:
I would mount your rotating axle on an upright micro-motor. Then, stand the
micro-motor on a base which you raise and lower. The axle could go up
through a hole in a technic plate if you want to hide the mechanism
underground. This brings us on to problem 2, raising and lowering.
Problem 2:
Three possible solutions here. The first is to use several vertical technic
beams with racks fitted, then use pinion gears to wind them up and down.
Gear them from a motor using a worm gear at some point to prevent slippage.
The drawback to this is that you either have these beams sticking up from
your moving platform, or they have to go underneath, making for a very bulky
mechanism below the surface.
The second is to use a scissor-lift. Arrange technic beams to form two Xs,
side by side. Between the tops of two of the beams fit wheels or some type
of sliding mechanism, so that they can slide along the underside of your
platform. At the base of the other two beams put a rack mechanism, so that
you can squeeze the scissors together and force the platform up.
The drawback to this is that the higher the scissors go, the less stable the
platform is. But, you could build one at each end of your platform and gear
them together. Again, use a worm gear off your motor to prevent slippage.
The third is the method used in the second-generation fork-lift truck - a
pneumatic lift. Put a pair of 16-tooth gears at the top of a pnematic
cylinder, and loop a chain over the top and down the other side. Anchor the
ends of the chain with wide track-links pushed into the holes of a technic
beam. Now when you extend the cylinder, the chains lift the platform by
twice the amount, bringing it up level with the top of the cylinder when
fully extended.
The drawback to this is that you will need several cylinders, and they're
unlikely to all move together.
Of course, you could use beams with racks on in place of the cylinders, and
loop chains (or string!) over the tops - a combination of the first and
third ones.
As for your hatches, just add racks to them and drive them back and forth
with a motor. You could use the same drive as raises and lowers the
platform, if you can time them right.
Jason.
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Message has 1 Reply:
 | | Re: Two Design Problems
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| Jason J. Railton <j.j.railton@cwcom.net> wrote in message news:G3nots.9z9@lugnet.com... (...) am First off, thanks for the input. I appreciate it. (...) the (...) The only problem with this is that, assuming I power both motors simultaneously, the (...) (24 years ago, 9-Nov-00, to lugnet.build)
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Message is in Reply To:
| | Two Design Problems
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| I am having a hard time solving two design problems related to the base I am building. Problem 1: I want to use a single motor to (slowly) raise a vertical shaft (e.g., a Technic axel mounted vertically) 8 to 16 studs. After raising the shaft to (...) (24 years ago, 7-Nov-00, to lugnet.build)
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