Subject:
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Re: New technique: three position piston control
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Sun, 25 Sep 2005 23:00:40 GMT
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Viewed:
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10687 times
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In lugnet.technic, Mark Bellis wrote:
> In lugnet.technic, Kevin L. Clague wrote:
<snip>
> >
> > I already have a paper design for a six legged walker with three leg groups
> > using forward/mid/back leg sweeps (what a surprise!) It walks using a 9 step
> > sequence. It only uses mid-stop on expansion, but not on contraction.
> >
> > Please let me know what you think.
> >
> > Kev
>
> Interesting stuff! Should make walkers move more smoothly, with the possibility
> of more groups of legs. The trick will then be reversing all the groups, since
> it was easier with just two, using two polarity reversers.
>
> I have a centre-stop mechanism for pneumatic steering for a JCB. It's not part
> of an automatic system though, since I don't yet have an application for that.
>
> Does your centre stop cylinder stop accurately in the same place every time,
> even under different pressure conditions? I thought if you put a lot of source
> pressure into the cylinder it might overshoot the mid-point, whereas with low
> pressure it would creep up to it. Accurate repeatable positioning is one of the
> challenges of this scheme.
The center stop is not the same spot when expanding vs. contracting. I did not
try it at different pressures. I just pumped a hand pump as fast as I could to
make the sequencer go.
I've not seen it overshoot the mid point.
>
> Mark
Kevin
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