Subject:
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Re: Help with redesigning a Boat Lock
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 4 May 2005 20:36:11 GMT
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Viewed:
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3083 times
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In lugnet.technic, Steve Hassenplug wrote:
> Actually, you don't really need sensors at the
> bottom, assuming the lock doesn't actually open
> at the bottom. Just run it down for a length
> of time, then run it up until the sensors are
> pressed...
Another possibility is to not make the connection between the lift lines and
the lifted frame rigid, but "slippable" (for instance, instead of using a single
line, use a loop that attaches to the frame by wrapping around several fixed
pulleys or something). When the frame is lowered, overlowering it will cause the
connections to slip and align the frame once per cycle. Getting the friction to
stay correct throughout the show may be an issue, but this way the system would
handle slight misalignments and correct them automaticly.
--
Brian Davis
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Message has 1 Reply:
 | | Re: Help with redesigning a Boat Lock
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| (...) The 'water' and especially the boat are quite heavy, so any slippable connections would not work. The weight would also cause problems with driving the string reliably. john (20 years ago, 5-May-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Help with redesigning a Boat Lock
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| (...) ... (...) ... (...) Rosco beat me to it... anyway... What about using string? With good rollers, the string should not wear out, at least not in one weekend. If the platform & boat are somewhat balanced, you could get away with one connection (...) (20 years ago, 4-May-05, to lugnet.technic)
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