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CHURCHILL BRIDGELAYER

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Old 09-05-2012, 12:40 PM
  #1
flamme
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Default 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









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Old 09-05-2012, 12:49 PM
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Default 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?
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Old 09-05-2012, 10:43 PM
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Default RE: CHURCHILL BRIDGELAYER

VERY NICE.....
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Old 09-06-2012, 12:09 AM
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Default 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...?
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Old 09-06-2012, 03:24 AM
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Default 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

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Old 09-06-2012, 04:53 AM
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Default RE: CHURCHILL BRIDGELAYER

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

http://www.rctankregiment.com/rctank...php?f=34&t=540
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Old 09-06-2012, 05:08 AM
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Default RE: CHURCHILL BRIDGELAYER

That is much simpler than Flamme's one, and definitely less interesting.
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Old 09-06-2012, 06:43 AM
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Default 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.
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Old 09-06-2012, 08:38 AM
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Default 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
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Old 09-06-2012, 10:25 AM
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Default RE: CHURCHILL BRIDGELAYER

If someone got the triangulare dimensions? etc....
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Old 09-06-2012, 10:17 PM
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Default 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....
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Old 09-07-2012, 07:56 AM
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Default RE: CHURCHILL BRIDGELAYER

I finally understand where it was locked.



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Old 09-08-2012, 09:33 AM
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Default RE: CHURCHILL BRIDGELAYER

My work

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Old 09-10-2012, 12:17 PM
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Default RE: CHURCHILL BRIDGELAYER

Fist run


http://www.youtube.com/v/6wR_L6jQVHw
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Old 09-10-2012, 12:25 PM
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Default RE: CHURCHILL BRIDGELAYER

Incredible !!
How did you achieve the transition between the two different pivots ?
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Old 09-10-2012, 12:29 PM
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Default RE: CHURCHILL BRIDGELAYER

WOW, that is nice.
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Old 09-10-2012, 12:56 PM
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Default RE: CHURCHILL BRIDGELAYER

You could disguise the hydraulic as a motor worm gear system for both elevation and laydown.
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Old 09-10-2012, 01:02 PM
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Default 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
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Old 09-11-2012, 03:26 AM
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Default 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
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Old 09-11-2012, 04:41 AM
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Default RE: CHURCHILL BRIDGELAYER

Where is my jaw?
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Old 09-11-2012, 06:03 AM
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Default RE: CHURCHILL BRIDGELAYER

OMG! [X(]
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Old 09-11-2012, 07:18 AM
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Default RE: CHURCHILL BRIDGELAYER

WOW!!!!!!!!!!!!!!![X(]
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Old 09-11-2012, 08:26 AM
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Default RE: CHURCHILL BRIDGELAYER

nice work of art man, it works just fine ... am curieus how it would end up
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Old 09-11-2012, 11:19 AM
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Default RE: CHURCHILL BRIDGELAYER

Incredible![X(]
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Old 09-11-2012, 01:19 PM
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Default RE: CHURCHILL BRIDGELAYER

An other test

http://www.youtube.com/watch?v=NsX1A...ature=youtu.be
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