Subject:
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Re: 18 wheeler truck
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Newsgroups:
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lugnet.build
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Date:
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Thu, 24 Dec 1998 07:00:28 GMT
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Viewed:
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3089 times
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On Thu, 24 Dec 1998 04:06:35 GMT, braml@juno.com (Bram Lambrecht)
wrote:
> James Mathis wrote:
> [about motorizing the 5571]
> > That sounds like quite a challenge. The 5571 model is pretty heavy.
> > I wonder if the most recent black Technic Super Car has been
> > motorized. I suppose so, but I haven't followed much Technic Talk.
> > Are the two models of similar mass?
>
> Unfortunately, I don't have the super car, so I couldn't tell you whick
> weighs more.
I believe the truck weighed more. By just a little bit. The super car
had heft, but it wasn't real heavy.
BTW, if you ever get a super car, try dropping it from about a foot up
onto a tabletop. Cool... :-)
> The 5571 is *heavy* and that's why my motorization didn't
> work. I tried to use two geared motors and extra gears for the rear
> wheels and an old motor for steering. It's too bad it didn't work - the
> motors fit perfectly. The two new motors fitted under the bunk in the
> sleeper portion and the steering motor fitted in the same space as the
> original steering. I was able to place a touch sensor behind the front
> bumper which was spring loaded. I even tried to put real lights in the
> headlights, but the fender got in the way of the bulky LEGO wiring.
> The motors worked (slowly) at about half the finished mass. However,
> when the whole thing was finished, it stalled. I was sick of gearing it,
> so I quit.
> If someone wants to try to do this, please let us know how it goes. As I
> said, there's plenty of room for the motors, the gearing is the problem
I just went through gearing an assembly that would slip every gear
arrangement I could devise. I ended up using technic chain to
transmit power. It works well, and so far it has only popped a link
apart one time, and that was really my fault for overstressing it.
Luckily, it didn't break the chain, just popped it apart.
Another advantage of the chain is I can add tensioners to each chain
to fine tune the position and alignment of the assemblies. And the
chain has very little play or slop in it, compared to gear trains.
-- Terry K --
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Message is in Reply To:
 | | Re: 18 wheeler truck
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| James Mathis wrote: [about motorizing the 5571] (...) Unfortunately, I don't have the super car, so I couldn't tell you whick weighs more. The 5571 is *heavy* and that's why my motorization didn't work. I tried to use two geared motors and extra (...) (26 years ago, 24-Dec-98, to lugnet.build)
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