Subject:
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Re: Has anybody successfully added an RCX to 7471 Mars Rover?
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Thu, 22 Jan 2004 20:44:44 GMT
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Viewed:
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484 times
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Calum Tsang wrote:
> Kelly McKiernan wrote:
>
> > Ever since I picked up the 7471 Mars Rover a few months ago, I
> > thought it screamed out for an RCX modification.
Me too - the Pathfinder rover was what ended my dark ages, trying to
replicate the suspension. I did eventually make a non-steering rover body with
the unsprung suspension that carried an RCX (massive structure, since I only had
two motors and had to power three wheels from each via the unsprung suspension.
To replicate the MER rovers, I've come to the conclusion that I really need
ten motors. Ugh. And, as you point out, the scale issues... having aquired a 4x4
Offroader, I'm considering a MER rover based on those (huge!) wheels, with the
gear motors tucked inside the wheel. Another possibility is wheels based on
turntables driven by gear motors, but I'm short a turntable.
> My issue is how to motorize the wheels without making it look
> stupid, ie having giant motor pods on the ends of the "suspension".
> You can't do it with micromotors (not enough torque)...
Have you actually tried it with six of them? Perhaps geared down? I know,
that's criminally slow, but the real things only move (at top speed!) 2
cm/sec... I've only got 2-3 gear motors, but I suspect it might work for a
lighter version. I know this is getting away from the simple "motorize the
LEGO-supplied model" ideal, however.
> PS-this model is more and more in my mind a disappointment.
I loved it (but I'm a space-nut), but the lack of the unsprung suspension was
a serious dissappointment to me. On the other hand, I loved the six-wheel (4
wheel?) steering and it was my first encounter with a vitually studless design.
Impressive amount of mechanism cramed into very little structure.
--
Brian Davis
(who will *not* be entering rtl15 with a marble-bot, but I *do* have a brand-new
(40-hour-old) baby girl to show for my lack of participation ;-).
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