Author Topic: Centurion Tank  (Read 9226 times)

Dave Winfield

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Re: Centurion Tank
« Reply #22 on: April 22, 2013, 07:22:11 PM »
April 22 - Latest update!

Work continues...slowly...but surely.
I am actually still enjoying myself! lol

With the rear compartments finished...
and the Instruction pages completed (up to this point),
I am ready to tackle the "covers" for the engine and transmission bays.

The covers them selves are not too much of an issue...there is a front (engine) cover
that has slots - staggered air inlets, and it is connected to the rear (transmission) cover
which is solid plates carrying some venting baffles over the radiators.
These two covers are connected in the middle by a row of "hinges".

My original plan was to make the covers with working hinges, but this turned out to be
a bit of nightmare.
First off, even at 1/16 scale, all the little plates that make up each hinge, are quite small.
And there are many, many to cut out.
There are ten Hinges...each with 5 plates...and each plate has two parts...and then laminated multiple times.



I made my first mistake, by not drilling out the hinge pin holes before I had cut out the parts.

Second problem is that each small plate still has to be a certain scale thickness. And this creates
a very visible layered paper/card edge. Colouring did not help much.  And the plates are not thick
enough to consider a 3D part...unless you like assembling extremely small parts with a microscope?

Eventually I gave up on these parts.

I have always tried to design my kits with the "beginner" in mind. I would rather simplify a part
for a better build, than leave it complicated for only an "expert" to handle.
So, I went back to the computer and came up with a simulated hinge part that doesn't actually
function, but assembles a lot easier.
I think the finished look is acceptable...and to be honest, I think I prefer the one piece cover assembly
which you can still lift off the two covers (as one assembly) to view the rear compartments.



So now, there are ten individual parts to assemble to make the ten hinges.
A few small fold and tabs, but with a pair of tweezers, I eventually got them done.

Covers went together with only a couple of minor tweaks.
(You can see all the finished hinge parts in the second picture below, ready to connect the two Covers)





Once assembled, and dropped into place on the Hull, it actually starts looking like what its supposed to!!
I only wish I had remembered to do some back side colouring on the cover parts...but i was so focused on
getting the fit and assembly, I didn't think about what might be visible within the vented cover.


I'm just finishing up the supporting cross members and side brackets (for the covers) which when installed
with give the covers a flush fit to the sides of the Hull.

The recessed and snug fit of the covers within the Hull sides means there will be no need for any sort of
attachment. 






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Dave Winfield

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Re: Centurion Tank
« Reply #23 on: April 23, 2013, 04:28:47 PM »
...follow-up update

New cross brace and side support brackets in place.
Pretty simple really...no need for anything complicated here.



And the covers drop in nice and snug, and very solid.

Other than some surface attachments, I think the Hull is complete.
Next step will be suspension and drive components.



and, to give you some sense of the overall size...so far...
(Willie is 1/18 scale, about 14" long...Centurion Hull is 1/16, and 18" long )



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milenio3

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Re: Centurion Tank
« Reply #24 on: April 26, 2013, 05:38:23 PM »
Not bad at all!!

Gee... I guess I will build one of these sooner or later...
- Gerardo
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Dave Winfield

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Re: Centurion Tank
« Reply #25 on: May 27, 2013, 10:06:43 AM »
Centurion Update May 26
........................................
wow, over a month since the last update!
sorry about that.
...but I had to deal with the Spitfire redraw and the release of the Spitfire Beer truck model.
So, I'll try to make this update a good one.

Work has continued behind the scenes, on the Centurion's suspension parts.
Unfortunately, what I thought was going to be a straightforward component, has turned
into a very frustrating exercise.  Numerous tweaks and changes have slowed down the design
but the biggest problem is still the fitting of the "tires" to the main suspension wheels.

I don't know all the names and actual terms for the parts, so please forgive my inaccuracies.
The Centurion has three main pairs of suspended Axles and Wheels on each side.
The track is driven and supported at each end by two large Gear Wheels.
Supporting the upper area of the Track are four main Idler Wheels,
and two minor Idlers front and rear.



Here is one the upper Main Idler assemblies. Basically a supporting bracket and two rubber tyred wheels.
I was going to make these with an axle and rotating wheels, but I changed my mind and kept the
assembly simpler. Its really not necessary for a static model...and thats the kind of thing the builder
could change if they wanted to.



I had a basic idea for the main Axle/Wheel sets and it worked out fine with a few small tweaks.
This is one of the two outer Suspension units...with pivot limiting linkages.
(The center suspension unit is only required to pivot a few degrees, so it doesn't have the external linkage)

Even though this unit is fairly large, I went for simplicity of build and tried to keep the part count to a
minimum.  I went with the simplest method of attaching the Wheels to Axles, and the end result gives
you rotating wheels (if you want them). Small Hub Caps lock the wheels on to the Axles.





This is where I ran into the biggest problem with my original design.
Fitting of the Main Wheel Tyres turned into a frustrating project.
In fact, I am still not happy with the design and am going to try some more alterations.
(If anyone would like to help by test building these parts, please let me know)

At first, I used two strips, around the wheel rim, to locate each assembled tyre.
But to keep the tyres fitting tightly to the rim meant I couldn't cleanly get them on to the
rim (over the locator strips). I tried about 6 different resizes and variations of the tyres to
make them fit...before giving up.  Eventually I settled on one center strip around the rim,
which the inner and outer tyre can butt up to.  This helps locate the tyre, but still leaves
the outer edges of the tyre very loosely fitted. And you can't easily glue the outer edges
because the glue will be visible and messy.

So the tyres in these pictures aren't even glued in place yet.




To assemble, the Main Suspension Units and Idlers just glue flat to the Hull at the marked locations.
Not the strongest connection I admit, but there's lot of surface area to glue and once
all six units are in place, the weight of the tank will be spread out sufficiently.



After the Units are attached to the Hull, pop on the Wheels and Hub Caps.

Other than some possible Tyre modifications, I like what I have so far.
I wish there wasn't so many Wheel Units to assemble!
But I think I will get them all done first,
before tackling the minor idlers,
and then its on to the front and rear Drive Gears.
The rear Drive Gear will also include the Main Drive output housings.



And to give you some "scale" sense, heres the model sitting on the side cabinet.
She's getting bigger...

Thats it for now.





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milenio3

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Re: Centurion Tank
« Reply #26 on: May 28, 2013, 01:55:08 PM »
I'm waiting to see how you are going to manage building the tracks.

If you have beginners in mind, I hope the tracks are going to be easy to do, but appealing at the same time.
- Gerardo
facebook.com/paperjerry

Dave Winfield

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Re: Centurion Tank
« Reply #27 on: June 08, 2013, 11:57:40 AM »
Just a short update...
works continues on the Centurion Tank...slowly.

Family issues and other projects have slowed down the work,
but I try to put in a few hours here and there.

I have been doing much repetitive cutting and preparing many little parts
necessary for the Suspension components.  This is the only real negative
aspect to doing Tank models in paper.  Lots of duplicate parts that make up
the drive wheels and tracks, etc.

Anyway, I have all the suspension units (for main road wheels) finished
and am installing them now (to the Hull).
Next up will be assembling the upper return Rollers and all the Road Wheels.

You may notice a slight colour difference between the earlier installed suspension
unit (at the rear) and the newly assembled units. This is the problem with not printing
everything at the same time. However, in this case, I also printed this last batch of
parts with a lighter ink level. My fault.  But to be honest, it is barely noticeable in person.
I think the camera flash exaggerates the colour difference.



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Dave Winfield

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Re: Centurion Tank
« Reply #28 on: June 17, 2013, 06:47:24 PM »
Latest update (June 16) just to keep everyone in the loop.
And to prove that works continues, slowly, behind the scenes!

With many repeated parts for the suspension and track support, its a slow build.
Lots of disks and tubes and strips and stuff to cut out!
Now I see why you guys love Tank models so much! lol

Pictured here, some of the parts for the Return Rollers...



and one of the return Rollers fitted into place.
I am quite happy with this.
Even though there are a few turning or rotating parts, the overall assembly is all fixed.
I am not trying to design a rolling system with moveable track.



and after some tedious work, I have finally got all the main suspension units (minus the actual Road Wheels),
and all the upper Return Rollers in place.
I have also got one of the front (single) Return Rollers installed...just working on the other side now.



I had some concerns over the front Idler Wheels and the supporting brackets and tensioners.
But after some experimenting I came up with an acceptable looking assembly.
I tried to simulate the track tensioner and the pivoting mount for the Idler wheel axle.
everything is fixed in one position, so there is no real adjustment for the Track.
I guess I better get the measurements right!


Idler wheel itself is not complete (no tread) in these photos.


and thats it for now!
...more work tonight!
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Dave Winfield

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Re: Centurion Tank
« Reply #29 on: June 19, 2013, 06:38:26 PM »
and, finished up the front Idler Wheel.



I'm not completely happy with it, but its acceptable.
Theres a lot of parts to assemble...not difficult, just a bit complicated.
And you have to cut out all the little ribs and glue them in place,
so its a bit tedious and hard on the eyes.

I tried a couple of different simpler versions, but at this scale, a certain level of
detail is required...which just serves to complicate the construction.

The mounting is a little wobbly too...but I won't know how wobbly until I
try to fit a Track.   So, for now, I am going to finish up all the other parts.
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Tapcho

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Re: Centurion Tank
« Reply #30 on: June 20, 2013, 01:18:45 AM »
Every time I see new pictures I like this design effort more and more. Humongous project in many sense. Great work so far. By the way I believe the driver used the turret entrance as the rest of the crew. The hatch in front was just for better visibility when driving in off combat situations (and for ventilation too).

Tappi

Dave Winfield

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Re: Centurion Tank
« Reply #31 on: June 20, 2013, 09:26:53 AM »
I believe there is a pass through from the interior (into the driver's cockpit)
but with the seat in place, it would be very difficult to get in and out that way.
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Dave Winfield

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Re: Centurion Tank
« Reply #32 on: June 23, 2013, 08:50:55 PM »
So, work continues on the Suspension parts
and the Track design.

Heres a few pics of the latest (second) design of the Tracks
and the individual track parts.

I have tried to drop the individual Track Links by using a strip section of Track.
Some pics below let you see the test build as it progressed, but I decided to do
a Video explanation of the current status instead...enjoy...

<a href="http://www.youtube.com/v/3vMR_Juo8g8" target="_blank" class="new_win">http://www.youtube.com/v/3vMR_Juo8g8</a>






DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!