Subject:
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Re: SSClagorpion - Status Report
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 19 Dec 2004 15:31:02 GMT
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Viewed:
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26794 times
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In lugnet.technic, Joseph Greene wrote:
> Well I have a leg design at current using 2 large cylinders that gets ~21
> cycles/minute with 1 leg and a 6 way radial pump (I don't have enough pumps to
> fill out the full 12 way...) but it's sturdy and strong and fully self
> cycling...the problem is working a circuit to have 4 legs moving in tandem at a
> time.. so I'm looking into a linkage design to handle the forward-backward
> motion and a wired linkage design for the up-down motion..., how are you
> planning your legs? individual motion with cylinders on all? how many
> cylinders/leg?
21 cyles per second is good. It will go much slower with 7 more legs.
Do you plan on having all the legs be self cycling? How will the legs stay
coordinated?
I plan on one pison for vertical, and one (maybe two) for horizontal. Do you
know the lock mechanism used on folding chairs and folding tables? I plan on
using that mechanism to lock legs into vertical down position.
I'm interested in hearing about your wired leg design. Using all LEGO parts? I
tend to stay away from modified or non-LEGO parts.
> The travel on a large cylinder seems to be ~5 studs, while the switch throw is
> 3 end to end.. is that about right?
Yes, so I'll need to only move 3/5 the volume of air needed in full throw
designs.
> I've found I can avoid the leakage if I'm using the cylinders in oblique angles,
> thus minimizing the leteral torque, but I coud be wrong...
In PhD hexapod walker, I had reliability problems because of the sheer number
parts involved: 12 large pistons, 4 small pistons, 26 switches for leg piston
instrumentation, and 48 switches for behavior modification.
> Mine is mostly Black and yellow as that is what I have the most of.. alas some
> white has intruded as well...
In general try to stay away from black, because it is hard to take pictures of,
and see the internal design.
> Given my current design, it's going to be huge.. on the order of 2'x3'... does
> that sound similar?
Yes, huge it is. The radial compressors, plus two RCX's, and the 8 legs make
for a large design.
I tried to make an inchworm out of small pneumatics (to make things faster), but
it had so much reliablity problems, I could never get it to work.
Kevin
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Message has 1 Reply:
 | | Re: SSClagorpion - Status Report
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| (...) Yeah, I'm estimating 1~2 cycles per minute with all 8. (...) The very reason I'm looking at a linkage solution.... (...) All lego accept possibly for the string/wire with crimped loops to loop over pins. MODIFIED LEGO! Never.. Back back.. foul (...) (20 years ago, 20-Dec-04, to lugnet.technic)
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Message is in Reply To:
| | Re: SSClagorpion - Status Report
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| Well I have a leg design at current using 2 large cylinders that gets ~21 cycles/minute with 1 leg and a 6 way radial pump (I don't have enough pumps to fill out the full 12 way...) but it's sturdy and strong and fully self cycling...the problem is (...) (20 years ago, 18-Dec-04, to lugnet.technic)
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