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  1. #1

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    CHURCHILL BRIDGELAYER

    I need your help. I'm trying to realize a churchill bridgelayer...but i've got a problem. When I make the kinematic of the system, i found that the bridge system works in two parts. To make the elevation I need to pull since the bridge is straight and to push to put it down. Hope you understand. I try to put photo to explain it










  2. #2
    yellowshaker's Avatar
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    RE: CHURCHILL BRIDGELAYER

    Someone on the rc tank regiment built a working model some time ago...I think it was Septon. perhaps search there for some info on how hhe made it?

  3. #3

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    RE: CHURCHILL BRIDGELAYER

    VERY NICE.....

  4. #4
    Elefant's Avatar
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    RE: CHURCHILL BRIDGELAYER

    Hi,

    I spoke with my friend Flamme on the phone and we came to the conclusion that we do not have all the elements to well understand the cinematic of this system.
    First, the piston course does not seem long enough to extend the bridge from the stored position to the laid down position. This point taken into account, it seems obvious the deployment of the bridge is done in two steps :
    - the bridge arm, in stored position on the tank, is PULLED by the piston rod until the the vertical position (90° angle). Then the rotating pivot that allowed this movement is unblocked to let the bridge arm go to the laid down position (180° angle), the rotating pivot being now the wheels axle. For this last step, the wheel structure must be temporary attached to the front of the tank and this time, the piston PUSHES the bridge arm.

    What do you think of this theory based only on the study of the resin model seen above...?

  5. #5
    borealis's Avatar
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    RE: CHURCHILL BRIDGELAYER

    I think your deduction is correct: pull until the wheels touch the ground (better, until the triangular support structure touches the front hull), then stop, unlock the pins and then it's just a matter of controlled release, since the bridge weight will lower the arm itself.
    Since the bridge is hinged at its center of gravity, it will stay horizontal during deployment.
    A well studied cinematic.

    About the piston: the real piston is just the first segment from the cylinder. It pushes the central sliding link along the rail. The second segment is a fixed-lenght pushrod hinged at both ends (one in the central sliding link, the other is between the locking pins), not the piston itself.


    edit: an image to better explain the above text


  6. #6
    mustclime's Avatar
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    RE: CHURCHILL BRIDGELAYER

    here is the churchill biuld.....he built the front mount one....

    http://www.rctankregiment.com/rctank...php?f=34&t=540
    That which does not destroy me just makes me more irritable

  7. #7
    borealis's Avatar
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    RE: CHURCHILL BRIDGELAYER

    That is much simpler than Flamme's one, and definitely less interesting.

  8. #8

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    RE: CHURCHILL BRIDGELAYER

    I think the bridgelayer that Septon is building is very interesting. It is a different design from the one that flamme is working on, and each has it's own special operational problems to be solved, IMHO. In either case, I applaud both projects. They both require skill levels I wish I had.
    Rex
    It is never too late to have a happy childhood

  9. #9

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    RE: CHURCHILL BRIDGELAYER

    Thank for your help.
    So The piston rod push the main arm it stays at the center of gravity...then at the locking pin (natural movement or humain action?) the reverse side of the piston for the second side of deployement?

    The locking pin works just at the finish of the movement of the triangulare stucture or it's locked by an mechanical action(or human?)
    thank you

  10. #10

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    RE: CHURCHILL BRIDGELAYER

    If someone got the triangulare dimensions? etc....

  11. #11
    borealis's Avatar
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    RE: CHURCHILL BRIDGELAYER

    Sorry I don't have any dimension.
    The pins would be both hydraulically operated (for easier operation) and manual (in case of hydraulic failure etc.). I dont' think they were automatic, too much dangerous in case of mis-disapplication.
    Difficult to replicate on a model, though. Maybe mini-electromagnet as pins....

  12. #12

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    RE: CHURCHILL BRIDGELAYER

    I finally understand where it was locked.




  13. #13

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    RE: CHURCHILL BRIDGELAYER

    My work


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    RE: CHURCHILL BRIDGELAYER


  15. #15
    Elefant's Avatar
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    RE: CHURCHILL BRIDGELAYER

    Incredible !!
    How did you achieve the transition between the two different pivots ?

  16. #16
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    RE: CHURCHILL BRIDGELAYER

    WOW, that is nice.
    That which does not destroy me just makes me more irritable

  17. #17
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    RE: CHURCHILL BRIDGELAYER

    You could disguise the hydraulic as a motor worm gear system for both elevation and laydown.
    Cheers
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  18. #18

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    RE: CHURCHILL BRIDGELAYER

    For the moment, with one gear motor I can make the two parts. I'm going to work on the system to lock the triangulaire pivot with one servo

  19. #19

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    RE: CHURCHILL BRIDGELAYER

    Second test with the bridge(not finish) to look if it was able to run.

    http://www.youtube.com/watch?feature...&v=u8BMkr3BSwc

  20. #20
    borealis's Avatar
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    RE: CHURCHILL BRIDGELAYER

    Where is my jaw?

  21. #21

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    RE: CHURCHILL BRIDGELAYER

    OMG! [X(]
    It is never too late to have a happy childhood

  22. #22
    yellowshaker's Avatar
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    RE: CHURCHILL BRIDGELAYER

    WOW!!!!!!!!!!!!!!![X(]

  23. #23
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    RE: CHURCHILL BRIDGELAYER

    nice work of art man, it works just fine ... am curieus how it would end up

  24. #24
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    RE: CHURCHILL BRIDGELAYER

    Incredible![X(]
    Tam Tiger 1, Tam Sherman M4(105), Tam Jagdpanther G1
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  25. #25

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    RE: CHURCHILL BRIDGELAYER



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