Subject:
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Re: SSClagorpion - Another creature - Greene Scorp
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 19 Jan 2005 06:42:38 GMT
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Viewed:
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28011 times
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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Joseph Greene wrote:
> > In lugnet.technic, Kevin L. Clague wrote: • <snip>
> >
> > I'm working on and 8 stage..
> > legs operating in 2 sets of 4 (A and B) with 2 motions each (Up/Down
> > Forward/Reverse) with control switches (SW1-4 Extended/Retracted).. :
> > AD -> SW1 Ext ->
> > AF -> SW2 Ext ->
> > BU -> SW3 Ext ->
> > BR -> SW4 Ext ->
> > BD -> SW3 Ret ->
> > BF -> SW4 Ret ->
> > AU -> SW1 Ret ->
> > AR -> SW2 Ret ->
> > AD
>
> Are the down legs coming up at the same time as the up legs are coming down?
>
> Sclagorpion will have all 8 legs down, then pick four of them up, shift, and put
> them back down before lifting the other four. This way the body does not go up
> and down as part of the walking cycle...
Yeah, Im looing to isolate each movement completely and have it so the body
doesn't have a grav well. I'm not 100% on the orderit may be that instead of AD
going to AF, I do AD, -> BU -> AF -> BR -> BD -> AU -> BF -> AR -> AD (would
certainly be more sensible), I might eliminate 1 switch by coupling the AF,BR
and BF,AR pairs
>
>
> >
> > The idea being that each switch consists of 4 small cylinders, no 1 of which can
> > flip a pneumatic switch by itself (at least non of mine seem to be able to),
>
> I have had luck with two small pistons flipping a switch.
Agreed, which is why I think a 4 piston switch would work awesomm it would, with
the mechanical stifness and the fact that all cylinders are pressurized in one
direction or the other at all times, prevent anything less than a clear majority
of the pistons (3 of 4) flipping the switch. While a unanimity could do so
handily and quickly.
> > Ok... so it is untested...I need another Backhoe and another 6 dacta pneumatic
> > service packs to finish it...maybe when the taxes come in..
> Yes, it probably walks faster than my synchronized walkers.
> I use two switches per large piston. One switch instruments when the piston is
> closed, and the other when it is open. The switches can be hooked in series to
> know when all four legs have transitioned forward and back.
>
> It never makes the next transition until all the pistons have completed their
> travel.
>
> I use two pistons per leg. One for vertical and one for horizontal..... Almost
> all the pistons are muscle pistons, but I need two switches (and pistons to
> drive them) that provide the proper timing of the overall circuit. Rather than
> have a central timer that the muscle pistons mimic, the muscle pistons are the
> timing pistons.
Hmm...my muscle pistons are only part of the timing reporting pneumatically to a
central timer...I'll have to see if I can wrap my mind aound how to get
themworking without a timer circuit...
>
> You can never have too much pneumatics.
I can't ever seem to have enough.. and the blamed cats have a hose fetish.. ARG.
<snip>
> > I wish... mine is gonna be hose city...
> Mine too. Two pistons, four switches, makes 12 hoses per leg.
Hmm. 2 pistons 2 switches per leg.. but still10 hoses per leg here.. and all
feeding off into the body...it's a regular circulation system...
> > > > - The feet swivel
> > > Yes, I have a quadraped with swiveling feet and it makes a big difference on
> > > traction.
> > Does it ever.. my quadruped high stepper (4" step height) can almost climb my
> > carpeted stairs with his u-jointed feet..
> Interesting.. Ujoint lets it flex whatever way it wants? No springs to try to
> hold it in position.
Well it is a custom ujoint I'll have to LDraw it up, and I do have itrubber
banded to provide a degree of stifness without significantly limiting it's
freedom..
> > <SNIP>
> I really enjoy them. I've run dry on ideas for a while which is why I went to
> quads.
I 've done Tripod through dodecapod succesfully...
> Cool. I could see that....Gotta see what we can do with 3-4-5 trianges.
My research show that the 3-4-5triangle is achieved with the 4-5-6 length pieces
of lego ast it then measure on the 3-4-5 lines at pin centers (su measuing from
end center to end center on a liftarm of 4studs nets a 3stud length.. it
confounded me for a bit until I realized the O.C. detail...
> > > My leg design has lock, but it is using the folding table leg technique you
> > > suggested.
> > Hm.. my legs have no lock...we'll have to see how it does...
> We figure it weighs so much we have to have locks so that it can stand up
> without pressure.
Good point.. I'll have to look at that...
> Thanks for the inspiration Joe...
Thank you guys...
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Message is in Reply To:
 | | Re: SSClagorpion - Another creature - Greene Scorp
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| (...) Awesome. (...) Are the down legs coming up at the same time as the up legs are coming down? Sclagorpion will have all 8 legs down, then pick four of them up, shift, and put them back down before lifting the other four. This way the body does (...) (20 years ago, 19-Jan-05, to lugnet.technic)
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