Subject:
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Re: MERLIN valves & sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 5 Sep 2004 19:35:22 GMT
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Original-From:
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Steve Baker <sjbaker1@SPAMLESSairmail.net>
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Viewed:
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1061 times
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Joe Strout wrote:
> Did you catch that these are *proportional* air valves? A LEGO mechanical air
> switch is not proportional, is it? (Genuine question -- I haven't gotten my
> hands on one yet, so I could be mistaken about that.)
LEGO switches certainly aren't proportional - but I question the value of
proportional pneumatic controls. The pressure either side of the valve
will equalize very rapidly even if the control is opened only a small
amount. Proportional valves can control the air speed - but not the
pressure.
So you could maybe control the rate at which a Lego cylinder would expand
or compress - but not the force it could apply or how far it would extend.
---------------------------- Steve Baker -------------------------
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Message has 1 Reply:
 | | Re: MERLIN valves & sensors
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| (...) But if you have a feedback system, the speed at which it activates is very important to avoid overshoot. Unfortunately the LEGO pneumatic switches do not make it easy to create feedback circuits, as they require a lot of force and have a (...) (20 years ago, 5-Sep-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: MERLIN valves & sensors
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| (...) Did you catch that these are *proportional* air valves? A LEGO mechanical air switch is not proportional, is it? (Genuine question -- I haven't gotten my hands on one yet, so I could be mistaken about that.) (...) Those are cool, but they only (...) (20 years ago, 5-Sep-04, to lugnet.robotics)
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