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 01:43:30 GMT
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Viewed:
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27761 times
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In lugnet.technic, Kevin L. Clague wrote:
<snip>
> > - The compressor (on top) uses 12 small cylinders
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=551846
>
> Wonderfully compact.
Almost as compact as my radial.. which I've developed /developing 3 and 6
cylinder versions as well.. the 3cyl radial is 12x13x4 studs and can easily be
run with any motor (even the micro), but the 9V RC motor seems to eat batteries
at a rate of a 6pack per 5 minutes, however it produces roughly 60 rpm on the 2
cylinder pneumatic wheel (steam engine style from Dr Soh's site).
<snip>
> > - The leg pneumatics are driven from cams, which run off the main motors. So the
> > forward/back motion would be sync-ed with the up/down via cams. Springs are used to
> > keep the switches against the cams
>
> There does not seem to be any guaranteed synchronization between the up down
> mechanism and the forward back. Slow pistons might not hit the ground before
> the front back transistions start.
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
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),
thus mathematically if all 4 are pressurized at all times no less than 3, fully
pressurized in a specific direction can flip the switch (even if 2 are in one
direction that leaves 2 in the other.. so at best when 3 are pressurized, they
might be able to overcome the last one and leave it slightly off sync)
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..
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=551860
> >
> > - Each leg is only connected to 2 pneumatic hoses
>
> That is nice and tidy.
I wish... mine is gonna be hose city...
> >
> > - 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..
<SNIP>
> > Comments:
> > This is a nice piece, but, personally, I'm not too fond of using the transmission to
> > shift the direction of leg movement, or for that matter, the whole worm->turntable
> > assembly.
> >
> > Don't get me wrong, I'd love to see it walk, and it's better than any walker I've
> > ever made... but then again, I've never made a walker...
>
> Steve,
>
> I think you should give it a try. Bipeds are the big challenge if you ask me.
Bipeds Rock! (Usually front to back or side to side).. seriously they are a fun
challenge...
> The octopod is an impressive piece of work. You'll be happy to know that
> bricklink orders are starting to arrive so I have enough red pieces to complete
> all eight legs in red. I've started to merge the RCXs, scout and radial
> compressor into the body.
Huzzah!
Wow.. I'm trying to do it with the Mana IR units...I think yours will be more
impressive.
> I'd like to avoid your standard rectangular body if possible. They look so
> unnatural.
I'm looking at something like an irregular Hexagon, or possibly Octagon for
mine...
>
> 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...
>
> Kevin
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Message has 1 Reply:
 | | 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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Message is in Reply To:
| | Re: SSClagorpion - Another creature
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| (...) There does not seem to be any guaranteed synchronization between the up down mechanism and the forward back. Slow pistons might not hit the ground before the front back transistions start. (...) That is nice and tidy. (...) Yes, I have a (...) (20 years ago, 18-Jan-05, to lugnet.technic)
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