 | | Re: New technique: three position piston control
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In lugnet.technic, Kevin L. Clague wrote: (SNIP) (...) 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 (...) (19 years ago, 25-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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(...) <snip> (...) 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. (...) (...) (19 years ago, 25-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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In lugnet.technic, Mark Bellis wrote: <snip> (...) Was this single or dual piston? (...) Kevin (19 years ago, 26-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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(...) Mark, Did I miss your answer on this? Kev (...) (19 years ago, 28-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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(...) No, I was so busy at work that I missed a couple of days online! I had a look at both, but a dual piston scheme works better for steering because of equalising the piston area and pushing at least 3 switches. In fact I have two cylinders in (...) (19 years ago, 28-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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(...) <snip> I used some axle joints to optimise cylinder position limiting in normal logic (...) Do you have a website where I can peruse your work? (...) (19 years ago, 28-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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In lugnet.technic, Kevin L. Clague wrote: (SNIP) (...) Sadly not, though I'll upload a lot more to my Brickshelf once my digital camera arrives. That will be better than circuits for explaining the positions of offset switches. I had also planned to (...) (19 years ago, 30-Sep-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: three position piston control
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(...) 6 legs and 3 leg groups is a great idea!! (...) I've think about overshooting the mid point and i don't know sure but i think it will overshoot the mid point whan you link them in serie isn't it?... and when you build it into a walking beast i (...) (19 years ago, 2-Oct-05, to lugnet.technic, lugnet.robotics, FTX)
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| | Re: New technique: three position piston control
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(...) I tried to make a sequencer using two mid-stop piston configurations, and it didn't work out on paper (at least the cases I tried.) Hmmm...... I think that with a walker, you probably need to add one more switch to instrument full (...) (19 years ago, 2-Oct-05, to lugnet.technic, lugnet.robotics, FTX)
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| | New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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(...) I have succeeded in directly cascading trinary pneumatic stages (where cylinders stop in the middle). This is a direct development of my mid-stop pneumatic JCB steering mechanism, which I first described here two years ago: (URL) (second (...) (19 years ago, 3-Oct-05, to lugnet.technic, lugnet.robotics, lugnet.announce.moc, lugnet.loc.uk)
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| | Re: New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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In lugnet.technic, Mark Bellis wrote: <snip> (...) Hmmmm..... this paragraqph mentions two pistons and three switches.... (...) I look forward to seeing them! (...) More ways are better! (...) Me too! (...) Kev (19 years ago, 3-Oct-05, to lugnet.technic, lugnet.robotics)
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| | Re: New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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In lugnet.technic, Mark Bellis wrote: <snip> (...) Mark, Any news on this effort? I'm intrigued by the thought of another mid-stop mechanism. Kev (19 years ago, 14-Oct-05, to lugnet.technic, lugnet.robotics)
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| | Pictures of New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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In lugnet.technic, Mark Bellis wrote: (SNIP) (...) Here are the pictures (at last!) They show the control stage, cascade stage and steering stage of Trinary Mid-Stop pneumatic logic. Start in the centre position: (URL) to the left: (URL) back to the (...) (19 years ago, 15-Oct-05, to lugnet.technic, lugnet.robotics, lugnet.loc.uk, lugnet.announce.moc)
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| | Re: Pictures of New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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(...) Hi Mark, cool stuff! I guess that the ganged switches on the far right are the switch stage, but I don't know what the other two large blocks are, or how they work. One thing I learned early with documenting MOCs, is to never use black when (...) (19 years ago, 15-Oct-05, to lugnet.technic, lugnet.robotics)
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| | Re: Pictures of New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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(...) Hi Kevin, Yes, the bottom right stage is the control stage, with 2 active switches. I left the third one in to keep the stability with the cams and 2L liftarms so that the 1x4 brick with holes moves as a parallelogram. I got into the habit of (...) (19 years ago, 15-Oct-05, to lugnet.technic, lugnet.robotics)
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| | Re: Pictures of New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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In lugnet.technic, Mark Bellis wrote: <snip> (...) Mark, I've tried to study the pictures, but I cannot resolve the mechanical linkages, and/or the pneumatic hookups. I was going to try to draw up a schematic, but I just can't resolve the images. (...) (19 years ago, 16-Oct-05, to lugnet.technic, lugnet.robotics)
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| | Re: Pictures of New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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(...) I'll start a schematic next week as this week is an unusual week at work. That should cover the pneumatic circuit. Basically, each stage gets a feed from the compressor, which goes to the middles of the two switches that drive the next stage (...) (19 years ago, 17-Oct-05, to lugnet.technic, lugnet.robotics)
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