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 22:07:47 GMT
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Viewed:
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3178 times
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In lugnet.technic, Jeff Van Winden wrote:
> For our current train layout I have attempted to create a working lift lock.
>
> Attempt 1:
>
> The lift lock project started about a year ago. My first designs used a scissor
> type construction ( XXXXX ) To try to raise the water, but there was not
> sufficient room under the water level to incorporate more then 1 or 2 scissors.
> Also the initial part of the Lift required two much torque to start compressing
> the scissors. We attempted to add pnumatics to help the scissor out but did not
> help much.
>
> Attempt 2:
>
> This attempt Used mutiple worm gears line up on an axle. One motor turned the
> axles and A Base plate with 2 8 tooth gears locked together per side ('teeth')
> attached would raise up as the axles turned. Prototype pictured below.
>
> http://www.brickshelf.com/gallery/jvwinden/Technic/Lock/dscn3509.jpg
> http://www.brickshelf.com/gallery/jvwinden/Technic/Lock/dscn3510.jpg
>
> After some refinement this design seemed to work.
>
> Attempt 3:
>
> Was a redesign or Attempt 2. We added two motors one to drive the front two
> columns and one to drive the rear columns The motors has an 8 thooth gear,
> connected to a 24 tooth gear, the changes in direction using new 16 tooth bevel
> gears and connected to the columns using the slim 20 tooth bevel gear. The
> Columns use 11 Worm gears each starting 1 stud into a 12 long axle, and ending
> one stud beyond a 10 long axle, Which is then connected to a axle pin, which is
> then set into a Technic plate and mounted into the wall..
>
> http://www.brickshelf.com/gallery/jvwinden/Technic/Lock/lift.gif
>
> Imbeded into the wall of the lift are 4 touch sensors, two on top, two on
> bottom, when the front or the back of the lift hit one of the sensors the
> appropate motor stops. When both motors stop. the program waits ro 60 seconds
> and then starts in the reverse order.
>
>
> This seemed to work quite well. At our last show (two weeks ago) the lift ran
> for about 1.5 hours and then started to fall apart.
> http://www.brickshelf.com/gallery/jvwinden/TrainLayouts/TheL/ToyShow0405/dscn4785.jpg
> http://www.brickshelf.com/gallery/jvwinden/TrainLayouts/TheL/ToyShow0405/dscn4786.jpg
>
> Slowly after time the baseplate that supported the 'teeth' that locked into the
> worm gears, began to tip to one side and the front and back. because the sensors
> were only on one side, the motor would continue to run and try to raise the
> other front or rear side. this caused two things to happen.. The worm gears
> started moving upward, since they could not spin any further, at the same time
> some of the 'teeth' came loose, and the Lift stoped lifting. Since this
> mechanism is in the middle of our layout it was inoperable for the rest of the
> show :(
>
> So is there a beter way to build a contraption that can lift a baseplate with a
> boat on it approximatly 20 bricks high. (17 actually)
>
> Limitations
> The contraption fits on 3 16 x 24 base plates attached on the long edges meaning
> it is 24 x 48 studs in size.
>
> The 'water' can only be 2 2/3 bricks above the baseplate
> There is room outside the 24x48 stud Lift for the Motors and RCX.
>
> Any sugestions would be greatly appreciated, As I would love to have this
> opperational for the Large NMRA Lego show in 'WKRP' ;)
>
> Jeff VW
That looks like a *great* project - I hope you can make it sturdy and reliable!
As Larry pointed out, you need to keep all the vertical worm gears in sync by
tying them all together. Do you have room for the 24t - worm gear gear blocks
in there? I could see one of them at the base of each vertical axle, with the
worm gears driven off a common feed. It would probably require multiple motors
working together, but that's not too difficult to work out. Just be sure to
keep as much "slack" out of the system as possible, so that all the vertical
axles turn at the same time.
The other thing I'd ask, do you have some support behind the vertical axles?
You'll need to keep them from flexing out away from the platform, since that
will cause the gears on the platform to slip down a 'tooth' or two, which will
cause the platform to flex. You want to make sure they stay "|", and don't
start going "(" or ")".
Yikes, I just re-read those paragraphs - I hope they make sense!
I look forward to more pictures. :-)
JohnG, GMLTC
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Message has 1 Reply:
 | | Re: Help with redesigning a Boat Lock
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| (...) What if two gears were used, one on either side of the the worm, effectively pinching it between them? That should stop any flexing and prevent the teeth from slipping. Jennifer (20 years ago, 5-May-05, to lugnet.technic)
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