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In lugnet.trains, Thomas Avery writes:
> In lugnet.technic, Bob Kojima writes:
> > you are right about synchronizing the motors. one of the motors runs
> > faster than the other. i made the string a little longer on one side. so
> > when the bridge starts to go up it is a little lopsided, but by the time it
> > reaches the top it evens out. not a very good solution but it works.
>
> I've hit a similar problem in planning out a crane. I've contemplated using
> two separate winches to lift the main hoist, but just like your drawbridge,
> one side can lift faster than the other. This depends on individual motor
> speed and the specific diameter on the winch drum (which varies as string is
> winched in or out).
>
> I'm not sure how to solve this effectively. The simplest way is to control
> each side independently, but that adds a lot of controls the user has to
> manage. You could use a RCX and two rotation sensors to keep the amount of
> string let out equal on both sides. But I've yet to try this.
In my view one of the simpler ways is to shaft connect the two motors if you
can... You can hide it if you have the sort of lift bridge that has an upper
connection between the two towers. It may not always work though.
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Message is in Reply To:
 | | Re: drawbridge
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| (...) I hope my bridge design spreadsheet worked okay for you. Your trusses look good! Nice work. Very nice! (...) I've hit a similar problem in planning out a crane. I've contemplated using two separate winches to lift the main hoist, but just like (...) (22 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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