Subject:
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RE: Worm Drive Question
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 25 Nov 1998 20:54:16 GMT
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Original-From:
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Louis-Marius Gendreau <lmg@admin.clic.netAVOIDSPAM>
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Viewed:
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1987 times
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If you do not want to be limited to four floors you could have one long rod
with "bumps" at every floor. With something sticking out of the elevator
car, you know you have reached a floor everytime the rod is lifted from the
ground. If you want to be able to set ground 0 to know where to start
counting you can put a sensor under the elevator car so it knows it is on
the ground. You then you need a kind of initialize routine.
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->
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->
| _
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->
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etc...
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S
S = sensor
| = rod
-> = spokes sticking out of rod
<- = spoke stiking out of elevator to lift the rod
The other way is to put a sensor on the elevator car that detects the bump
on every floor. That's much simpler but the brick and motor get to be on the
car and hence it gets to be pretty big.
--
Louis-Marius Gendreau
Président, ClicNet Télécommunications, Inc
Qué: 418-686-2542 Fax: 682-6247
Mtl: 514-875-8830 Fax: 875-0571
lmgendreau@clic.net
-----Original Message-----
From: John Scott Kjellman [mailto:jkjellman@ameritech.net]
Sent: Wednesday, November 25, 1998 12:07 PM
To: LEGO Robotics List
Subject: Re: Worm Drive Question
Just to toss in my three cents (inflation adjusted to 1998 rates ;-)
It seems there are two more options that might be a little easier:
1) My kids have gotten a couple of Lego sets that contain a long square
shaft that has teeth on it. It mates to a large brick that contains a
small gear attached to a shaft. If you insert the rod into the brick
and turn the shaft the rod moves in/out (or up/down, depending on its
orientation). This has a travel of about 8 inches.
[SNIP]
I was thinking about building the same thing (my 4 year old loves Legos
and elevators). I had planned on approach 2) coupled with a long rod
connected to a touch sensor. The rod would have wedge shaped bumps at
every floor so that as the elevator passed it would trigger the touch
sensor. that way you would know what floor you were on. You could then
use the other inputs for the floor buttons (four floors would be the
maximum without an extremely clever mechanism to allow the reuse of the
third input).
Oh well, enough rambling...
Take care,
KJohn
stephen p spackman wrote:
>
> Matt Sailors wrote:
>
> > > Sorry I Lost you there, what do you mean by cut Lego?
> > >
> > > Tim
> >
> > I mean cut threads (like on a screw) into the axel using a thread
> > cutting tool (part of a tap and die set available at most good hardware
> > stores). Check out http://www.net-info.com/~dcarlson/ near the bottom
> > of the page.
>
> Sure, you can do this with puppies, too! Ick, shudder!
>
> ("Arthur, Arthur, come quick! Someone's knurled the cat!"
> - hypothetical Monty Python skit)
>
> stephen
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Message has 1 Reply:
 | | RE: Worm Drive Question
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| If you do not want to be limited to four floors you could have one long rod with "bumps" at every floor. With something sticking out of the elevator car, you know you have reached a floor everytime the rod is lifted from the ground. If you want to (...) (26 years ago, 25-Nov-98, to lugnet.robotics)
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