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-   -   CHURCHILL BRIDGELAYER (http://www.rcuniverse.com/forum/rc-tanks-369/11218575-churchill-bridgelayer.html)

flamme 09-05-2012 12:40 PM

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

http://img86.xooimage.com/files/f/d/..._z-37b5a76.jpg

http://img86.xooimage.com/files/2/3/...ff-37b5a86.jpg

http://img86.xooimage.com/files/2/4/...fg-37b5a9e.jpg

http://img88.xooimage.com/files/6/f/...r2-37b5ab0.jpg

http://img88.xooimage.com/files/0/c/...r3-37b5ac4.jpg

yellowshaker 09-05-2012 12:49 PM

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?

CCC2012 09-05-2012 10:43 PM

RE: CHURCHILL BRIDGELAYER
 
VERY NICE.....

Elefant 09-06-2012 12:09 AM

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...?

borealis 09-06-2012 03:24 AM

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

http://i36.servimg.com/u/f36/15/16/85/12/bridge10.jpg

mustclime 09-06-2012 04:53 AM

RE: CHURCHILL BRIDGELAYER
 
here is the churchill biuld.....he built the front mount one....

http://www.rctankregiment.com/rctank...f=34&t=540

borealis 09-06-2012 05:08 AM

RE: CHURCHILL BRIDGELAYER
 
That is much simpler than Flamme's one, and definitely less interesting.

Rex Ross 09-06-2012 06:43 AM

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

flamme 09-06-2012 08:38 AM

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

flamme 09-06-2012 10:25 AM

RE: CHURCHILL BRIDGELAYER
 
If someone got the triangulare dimensions? etc....

borealis 09-06-2012 10:17 PM

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....

flamme 09-07-2012 07:56 AM

RE: CHURCHILL BRIDGELAYER
 
I finally understand where it was locked.

http://img88.xooimage.com/files/8/1/...07-37bf713.jpg

http://img87.xooimage.com/files/1/3/...09-37bf717.jpg

flamme 09-08-2012 09:33 AM

RE: CHURCHILL BRIDGELAYER
 
My work:D

http://img88.xooimage.com/files/5/8/...19-37c6b04.jpg

flamme 09-10-2012 12:17 PM

RE: CHURCHILL BRIDGELAYER
 
Fist run


http://www.youtube.com/v/6wR_L6jQVHw

Elefant 09-10-2012 12:25 PM

RE: CHURCHILL BRIDGELAYER
 
Incredible !!
How did you achieve the transition between the two different pivots ?

mustclime 09-10-2012 12:29 PM

RE: CHURCHILL BRIDGELAYER
 
WOW, that is nice.

heavyaslead 09-10-2012 12:56 PM

RE: CHURCHILL BRIDGELAYER
 
You could disguise the hydraulic as a motor worm gear system for both elevation and laydown.;)

flamme 09-10-2012 01:02 PM

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

flamme 09-11-2012 03:26 AM

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

borealis 09-11-2012 04:41 AM

RE: CHURCHILL BRIDGELAYER
 
Where is my jaw?

Rex Ross 09-11-2012 06:03 AM

RE: CHURCHILL BRIDGELAYER
 
OMG! [X(]

yellowshaker 09-11-2012 07:18 AM

RE: CHURCHILL BRIDGELAYER
 
WOW!!!!!!!!!!!!!!![X(]

karel47 09-11-2012 08:26 AM

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

Buckeye36 09-11-2012 11:19 AM

RE: CHURCHILL BRIDGELAYER
 
Incredible![X(]

flamme 09-11-2012 01:19 PM

RE: CHURCHILL BRIDGELAYER
 
An other test

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


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