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'[PICLIST] [OT]Help with sourcing robotic parts'
2000\12\20@233550 by Peter May

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I need help (just ask my ex wife) locating some things and some ideas on
other things.

1: I am trying to find some caterpillar tracks. That's what we call them
here in Oz anyway but it's the things that bull dozers run around on. I need
to make a 12 or 24 volt mobile transport that would weigh in around 220 kilo
grams and have it move around an area by itself. At some stage I can see it
having to turn on it's own radius. I figure I need ones a metre or so
long... Please throw your thoughts this way as I am stumped here in
Australia.

2: The above item only has to move at a slow pace. I need to put together a
drive system for it using anywhere between 6 and 24 volts I suppose. Forward
and reverse for each motor (1 per side) and a bit of speed control. I figure
the faster the better but if I can get it to go but only at a slow pace I am
happy. Where would I get some high power motors that would suit? I have no
size requirements at this stage so if they are on the big side it doesn't
matter as long as they are strong.

Thanks in advance

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2000\12\21@050547 by Alan B. Pearce

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>At some stage I can see it
>having to turn on it's own radius. I figure I need ones a metre or so
>long... Please throw your thoughts this way as I am stumped here in
>Australia.

check your army depot for spare tracks for those remote bomb disposal robots???
;)))

Sorry just a sudden thought. Obviously someone makes them.

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2000\12\21@052912 by info

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In message <010b01c06b35$a31e8920$.....5dbdf682KILLspamspam@spam@ssdwkiwi.AG.rl.ac.uk>, Alan
B. Pearce <A.B.PearcespamKILLspamRL.AC.UK> writes
>>At some stage I can see it
>>having to turn on it's own radius. I figure I need ones a metre or so
>>long... Please throw your thoughts this way as I am stumped here in
>>Australia.
>
>check your army depot for spare tracks for those remote bomb disposal robots???
>;)))
>
>Sorry just a sudden thought. Obviously someone makes them.


Try alvis in the UK



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2000\12\21@071156 by Stephen B Webb

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> 1: I am trying to find some caterpillar tracks. That's what we call them
> here in Oz anyway but it's the things that bull dozers run around on. I need

I would look at construction equipment supply stores.  There is something
here in the states called a "bobcat" (and similar offerings from other
companies) which is essentially a miniature bulldozer.  It is smaller than
most cars (I'd say smaller than a Ford festiva (fiesta?), VW polo, etc)
It has 4 wheels, with tires about 16" diameter, maybe.  Anyway, you can
buy treads/ tracks for this piece of equipment that fit over the tires and
make the vehicle much more capable in snow/mud/etc.   The wheelbase (and
hence the tread length) is probably closer to 2 meters than 1 meter,
though.  The vehicle is much heavier than 220 kilos, so these treads might
be too big (and expensive).

BUT, there are other pieces of construction equipment that have treads.  I
believe I have seen a "ditch witch" (trench digger for laying underground
pipes, etc) that had a smallish tread (1 meter appx);  maybe you could get
ahold of something like this?

Additionally you might consider snowmobile treads.  They tend to be
somewhat wider than typical treads (As there is only one per snowmobile,
instead of two) but it may work.  I'm guessing finding a source for
snowmobile treads might present a problem, though.

> 2: The above item only has to move at a slow pace. I need to put together a
> drive system for it using anywhere between 6 and 24 volts I suppose. Forward
> and reverse for each motor (1 per side) and a bit of speed control. I figure

Again, budgetary concerns might cause problems, but I have an idea.

There are electric scooters that are available in the US which are
intended to be used as personal transport for lazy folks.  They are in the
$350-$550 range, I believe.  They come complete, and ready to go.  I have
used one particular type, and it worked well.  Effective range was 10-15
miles, and they claim a top speed of 15 mph.  They use 24 volt batteries,
I think (4 6 volt gel cell type batteries, I believe) and have an
electronic speed control, and a fairly capable drive motor.  The unit
itself weighs about 30 lbs, and with my big self on it, the total weight
pushes past 250.  So, the motor in oroginal configuration was capable of
moving in excess of 100 kilos, I imagine two would be plenty capable for
your needs, especially if you were using smaller tires, or geard them
down.

The nice thing about this thing is that it is a package deal.  Motor,
batteries, speed control, etc.   The bad thing is that it doesn't go in
reverse, but you might have luck making it so.


The particular brand name for the scooter I am familiar with is "CityBug".

I have seen several similar such scooters being sold on ebay.  Search for
"electric scooter".

Good luck
-Steve

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2000\12\21@121317 by Dan Michaels

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At 10:06 AM 12/21/00 -0000, you wrote:
>>At some stage I can see it
>>having to turn on it's own radius. I figure I need ones a metre or so
>>long... Please throw your thoughts this way as I am stumped here in
>>Australia.
>
>check your army depot for spare tracks for those remote bomb disposal robots???
>;)))
>
>Sorry just a sudden thought. Obviously someone makes them.
>

IS Robotics makes various autonomous vehicles for sale to
the military for such tasks:

http://www.irobot.com/rd/index.htm

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2000\12\21@162401 by steve

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> 1: I am trying to find some caterpillar tracks.

Look up "conveyor" in the yellow pages. Pick one that mentions
vulcanising and they'll make exactly what you want. If not, they'll
point you in the right direction.

Steve.
======================================================
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TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
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