Subject:
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Re: Mr. Jeeves
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Newsgroups:
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lugnet.build.mecha
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Date:
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Tue, 20 Dec 2005 13:48:56 GMT
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Viewed:
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2023 times
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Hi Eric,
I have a habit of waking people up - not one for light conversation eh?
On 20/12/05, Eric Sophie <mylegomaster@aol.com> wrote:
> Good morning. (yawn) ahhh, yes, the Mana Cat, yes Manas.
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=128009
> Gah, coffe.
Cool - although it didnt work out, it is definately a cool attempt. I
like those boxes, there are only 3 channels you can use with them. I
did at some point have a page on using them with the RCX, but for some
reason I cannot find it (time to rebuild and repost it?) - I certainly
know it can be done - and have done it myself. I do have a demo
program to do it with NQC
http://orionrobots.co.uk/tiki-list_file_gallery.php?galleryId=1
I am yet to post a design I started with manas that I never got to
finish - it was a Jonny Number Five attempt (I am sure many builders
have had a go at that one).
>
> Um, ya, the Mana Cat was suxxor. Incorrect lower legs, trouble with the neck
> area. Really hit some brick walls. hahaha brick walls. Slayer.
>
> I did walk away with some cool ideas, like the ankle return set up.
> The same mechanism was used x4 for the spine, it allowed the Cat to bend
> forward
> and arch its back then return under the spring load.
Cool - this is really the biomechanical stuff there.. Like I say -
never stop learning. There is nothing wrong with having a go, at least
you learned from it.
>
> It was wild when I used the controller. But really hard to control.
> I reached the motor's stall load, and the fact that each Mana responded to the
> controllers in weird ways.
Hmm - how do you mean "weird ways"?
> No two positions were the same, like it had 16 differnt movements, really hard
> to remember what was what.
Maybe it would have been easier to get an RCX, and then use the RCX
remote to talk to the RCX, and the RCX would then split up signals to
go the manas - although I seem to remember that the RCX remote and the
manas may not work together too well..
>
> One other thing that was tough was the size. Adding 10L axles to either side
> of
> the Mana units for the worm gear set ups made the legs really big.
> That along with only a minimal amount of gear reduction made for additional
> issues.
I have experienced exactly that when building robot arms. Sometimes
you have to think things through to make sure that the gearing at the
end of your arm is not going to be too heavy to lift..
>
> Maybe I'll try again sometime. I rather get another pair and make an elongated
> Hexapod design like the RG Mech.
There have been some really amazing pneumatic hexapods appearing on
.robotics. I would love to see some more efforts than span both these
groups. I will repeat what I have said before - it was your Jama that
actually got me lurking on .mecha eric.
>
> > The joints are all posable with worm gears arent they? I had a thought
> > last night on a "compliant" worm gear based joint - which involved
> > fixing the gear onto an axle, and allowing a housing assembly around
> > the axle to move a little with a technic suspension - thus giving a
> > joint a little compliance, which still springs back to the desired
> > position when the force comes off. The alternative I had (which is a
> > great deal more "human") was to use elastic-band tendons, and then
> > have a set of two (or four using long pins) technic pulleys - either
> > side of 2 pins - so a contraction would mean reeling in (winding up)
> > the elastic band between the pulleys. The pulleys would probably be
> > best driven by a high reduction system with a worm gear, and maybe a
> > clutch to ensure that the thing stops before the band snaps. I may
> > design an arm - and later a whole mech based on that...
>
> Wait I just woke up! Head hurts! Sleepy. Time for my morning run.
Sorry - that was a bit of an intense databurst - I do that sometimes -
it tends to get the "rabbit between headlights" look from people.
> Do you mean like this?
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1224292
> That is a spring loaded return joint dealy.
That was my initial concept, although now I have a bit of winter
holiday, I am going to try my elastic band tendon idea - at first just
with a poseable joint.
<snip>
> > I am always interested in socket/ball joints - and larger ones more
> > so. Maybe we will see more of these in the coming lego mech series.
> > Anyway - I think it looks good, thanks for posting them eric.
>
> The only issue is they can't hold any weight.
> A Technic pin fits in to the socket, but easily comes out.
> The 4 stud depression helped to secure the joint, but weight pressing down is
> what really makes the set up work in the case of Mr. Krinkle and Mr. Jeeves.
Fair enough - thanks for the heads up, I am still thinking of buying some.
>
> I once tried an experiment to secure and bind the socket as a joint here in
> the
> Dancing Sun Power Suit, the result looked like the Mech was in traction!
> hahahahha, I wanted to see if it could be done:
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=54980
> see images:
> ds-03-front.jpg and ds-04-rear.jpg
Ah - now I am really thinking - I could take this idea, use the ball
joints with the elastic bands, and then skin over it a bit with
overlapping stuff to hide the joint itself. Thanks eric - I am now
really inspired to go off and try and build this thing.. Once I have
finished a few things that maybe a little project for me.
<snip>
> Have a good day!
>
> e
Thanks eric, you too.
--
Danny Staple MBCS
OrionRobots
http://orionrobots.co.uk
(Full contact details available through website)
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Message has 1 Reply:
 | | Re: Mr. Jeeves
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| (...) That was funny. (...) together so I had hoped to be able to control them more presicely using code or the remote. I planned to look in to the technique to control them more independantly. (...) Oh nice! (...) Yes, there were some cool things I (...) (19 years ago, 21-Dec-05, to lugnet.build.mecha)
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Message is in Reply To:
| | Re: Mr. Jeeves
|
| (...) Good morning. (yawn) ahhh, yes, the Mana Cat, yes Manas. (URL) coffe. Um, ya, the Mana Cat was suxxor. Incorrect lower legs, trouble with the neck area. Really hit some brick walls. hahaha brick walls. Slayer. I did walk away with some cool (...) (19 years ago, 20-Dec-05, to lugnet.build.mecha)
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