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In lugnet.build.mecha, Edward Cox writes:
> Hi, well some weeks ago I promised that I'd begin a project of developing a
> Mech incorporating the RCX unit, some motors and sensors.
>
> Here is my very first attempt at a minifig scale Mech:
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?m=brickfield
I like the design, but as with most RCX-based walkers, it looks, well, 'clunky'.
I realize this can't be helped considering the nature of what it is you are
working with. I, too, have been working on a walker of this nature and have met
with NO success so far. Either it looks too clunk or it just won't move.
> The RCX is programmed using MacNQC and at this stage only utilises one motor
> for the motion (non COG [centre of gravity]), one Micro Motor to rotate the
> upper body (head), and two lights at front for effect only.
>
> The actual bi-ped mechanism is based on that designed by Joe Nagata (Thanks
> Joe!) in his Idea book.
>
> At this stage it is:
> a) too heavy (strain on single motor)
> b) too weak (falls apart from shaking motion)
> c) not agile (only operates on flat surface)
> d) top too heavy - micro motor is under strain to turn/rotate upper body due
> to weight and weakness of single point holding it up.
all of these seem to be a common problem. d is particularly annoying when trying
to create something that looks good. So far I haven't found a solution. Weight
is more of a factor than in most models, but trying to get the model to move
under it's own power while looking good may be too much to ask for given how big
RCXs are.
The shaking motion might be solved in an unusual way: by using non-ABS materials
such as corrugated tubing, rubberbands, etc. These can help diffuse the shaking
motion a bit. I wish I could find the link for the biped walker that solved the
shaking problem by wrapping the feet with rubberbands, but alas, I can not.
>
> but Hey! it works.
Congrats! That's better than I've accomplished thus far.
> What to do next?
>
> a) add touch sensors
> b) add light sensor to upper body (head).
> c) add sound generator unit.
> d) perhaps utilise pneumatics?
>
> So, what do you think? Suggestions, criticisms?
Good ideas for future revision. I wish you much luck in this project.
> I know it's early days yet - but if there's anyone at LEGO that see's this
> and wants to offer me a job just drop me a line :-) (doesn't hurt to ask!)
>
> Kind Regards,
>
> Ed Cox.
> ecox@bigpond.net.au
-Dave Johann
LUGNET Member #524
Founding Member: LUGOLA
HardCore's Haven
http://members.home.net/legomecha/index.html
Beyond Bionicle: Lego Mecha Creations
http://clubs.yahoo.com/clubs/legomechaforum
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