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> Has anyone tried using a single motor, and putting the motor in the
> span? I know it isn't prototypical, but if the motor was in the span,
> and the string/chain was drawn into the span by a single motor, then the
> span would pull itself up evenly. This was just a thought, I haven't
> tried it.
I used a single motor, with all cables being passed above the top of the span
to get to the far side (4 cables). One trick that I would do if I was building
another one is to make the cable drums easier to adjust to one another, since
they tend to get out of sinc even with just a single motor driving them. (rope
would wind unevenly).
I found that this system worked OK with a 5.5 track segment bridge. I'd be
tempted to try counterweighting a larger bridge, to make it a bit easier on the
motor for lift force. Mine was not counterweighted, and put a fair strain on
the motor (a geared motor). After motor reduction was 24:1 via worm, which is
very useful for the self locking if nothing else.
James Powell
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Message has 1 Reply:
 | | Re: drawbridge
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| "James Powell" <wx732@freenet.victoria.bc.ca> wrote in message news:HE4yp6.15uI@lugnet.com... (...) span (...) building (...) since (...) (rope (...) Just a thought when reading this thread: If you have trouble with motors that do not run with the (...) (21 years ago, 1-May-03, to lugnet.technic, lugnet.trains)
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Message is in Reply To:
| | Re: drawbridge
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| (...) That is a nice bridge, but I was chiming in to comment on syncronization... Has anyone tried using a single motor, and putting the motor in the span? I know it isn't prototypical, but if the motor was in the span, and the string/chain was (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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