Author Topic: Centurion Tank  (Read 9228 times)

Dave Winfield

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Re: Centurion Tank
« Reply #44 on: August 02, 2013, 07:11:59 PM »


http://www.samsung.com/us/photography/camcorders/HMX-W300BN/XAA
I got me one of these things...
Pretty cool little camera, cost me $60
and works like a charm!

so....a New video report!

(now, if I can only figure out how to upload in HD!)

<a href="http://www.youtube.com/v/JcQVeX41dhE" target="_blank" class="new_win">http://www.youtube.com/v/JcQVeX41dhE</a>

Dave's Card Creations YouTube Channel
http://www.youtube.com/user/davescardcreations?feature=mhum


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Dave Winfield

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Re: Centurion Tank
« Reply #45 on: August 04, 2013, 05:11:24 PM »
well, after a considerable amount of farting around...
I have finally settled on a Track design! lol

Each Track link has 5 parts...only three of which require more difficult construction.
(One part is just a flat spacing element)

I have added a fifth part to the inside of each link to improve the smooth "roadway"
that the Road Wheels run against. The previous design left obvious "speed bumps"
caused by the rolled hinge pin tubes.



I have assembled a section of Track...14 links...and recorded the time involved to assemble the parts.
Including cutting out all the parts, scoring, trimming, forming...and then assembling each link...and
then cutting, sanding and fitting wooden pins...I estimate a total of 6-7 hours.

Now that I know exactly what I am doing, and I have established a step-by-step method, I believe I can
do the same in about 4 hours.  So, the estimated 210 links required for both tracks should take at least
60 hours.
Based on what I am hearing and seeing with regards to other paper Tank models, this isn't unreasonable.

As you can see, the fit of the Road Wheels is a lot more realistic now and the Track fits very well
against all the Wheels, Rollers and Drive...so I am quite satisfied.







Now, I can put the Track aside...and get back to the Tank itself.
Hopefully I can work on Track parts whenever I have nothing else to test build.
Wish me luck!

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Vermin King

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Re: Centurion Tank
« Reply #46 on: August 04, 2013, 10:09:42 PM »
This does look very good.  Good luck.
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Dave Winfield

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Re: Centurion Tank
« Reply #47 on: August 12, 2013, 11:25:06 AM »
So, I had no problem laying out the parts for the Track covers
but fitting them to the tank was a bit trickier.

First problem is the covers have a very narrow mounting strip.
Not a lot to work with when trying to glue the cover to the Hull side.

And then theres the lack of hanger brackets.
Two brackets at the rear (awkward to attach to the Hull
...one at the very front (doesn't do much at all!)
... and one storage box (the one closest to the rear).
Sounds like plenty...but that leaves a long section unsupported
and the cover width and weight is a lot more than these "paper" brackets can handle.
(I'm sure on the real thing, metal rigidity and the strength of the steel brackets is enough to support things.)

I may tweak a few things, maybe separate the mounting strip from the covers.
This would allow you to position the mounting strip to the Hull as a small shelf.
And then sit the cover on top of it...using the upper supporting brackets to hold it up?

lol just thinking out loud...

anyway, with a little effort I have got the first cover in place...and the storage boxes.
I'll sort out the other side before I look at the Mufflers and exhaust pipes.



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Dave Winfield

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Re: Centurion Tank
« Reply #48 on: August 18, 2013, 07:26:23 PM »
Track Covers update #2....
and the frustration continued.

lol
actually, things didn't go that bad, once I had a few things figured out.
I made a number of changes to improve the assembly and installation of the Track Covers.
Unfortunately, I was not able to implement them all in my own build.
So my build was still a little slow.

In real life the light weight and rigidity of the Track Cover sheet metal would allow them to be
suspended much better on the heavy steel brackets...even though the brackets are few
and oddly spaced.
In paper, its not so easy. I can't transfer the strength of angle iron brackets into small paper parts.
But with some extra glue here and there, and a little bit of twist and bend and sag...
I finally got it all together.
Not perfect, but its together.

For the kit itself, I have enlarged the mounting edge of the Cover plates and added some little gussets.
I've also adjusted some sizes and lengths to improve the fit and angles of the parts.



I also got caught up on a couple of other areas (for which I already had parts made)...

Track Covers are completed with the installation of the storage containers.
The two rear smallest containers are also supporting brackets.

And I have installed the front glacis storage container, along with the Tow hooks
and a few little surface features...fuel tank caps, stops for the Hatch covers, etc.

And you may also notice the ring spacer for the turret. Basically just an extension on the Hull
to lift the Turret slightly. It allows clearance for the Turret over a few objects that are higher
than the top of the Hull.

Next...another 3 inches of Track! That should take a week. LOL


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Dave Winfield

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Re: Centurion Tank
« Reply #49 on: August 24, 2013, 08:15:13 PM »
Took me a week!...off an on over the last seven days, an hour here, an hour there...
but I added a few more Track links.
Got roughly 240mm of Track completed...about 9 inches...
which is close to one quarter of a full Track (for one side of the tank).


lol stop laughing...I'm serious...stop laughing...look



I got so excited at seeing a longer length of Track, that I couldn't help myself...
I just had to take a couple more photos!

Now back to the car race.



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Dave Winfield

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Re: Centurion Tank
« Reply #50 on: September 20, 2013, 08:12:48 AM »
Its been a while since my last Centurion update, lots of other stuff going on this past month.
But I have still been working on the Tank every now and then.

The exhaust parts have been designed for some time...I finally got a chance to test fit them.
A small issue with clearance over the bracketry, but the dimensions and look are good.



The exhaust outlet opening is a little big. The real thing appears to be a much narrower opening.
I haven't decided if I am going to change it yet...I don't want to make it too hard to assemble.

Details are just the basics, since this all gets covered by two heat shields (which I already have made).



So, I will keep wroking away at this and other surface details.
Haven't done any more Track parts.
But I have begun design work on the Turret.
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Dave Winfield

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Re: Centurion Tank
« Reply #51 on: September 26, 2013, 10:06:45 AM »
Centurion Update...I still haven't completed the Exhaust parts (as were shown in the last updates).
I think I made all the necessary tweaks...I just haven't got around to test final assembly yet.

Reason is...I had a dream involving Paper Glue and Kate Upton...

...and then I woke up and had a big brainstorm regarding the Turret internal formers.

I have been pondering the method of creating the forming structure for the Turret (for some time).
Issue is: how many pieces, how complicated, do I have opening hatchways, can I install an interior?

I did have an idea for a cylinder which would allow the Turret to attach and swivel on the Main Hull
and I could put some interior parts inside that cylinder.  But one of the immediate problems is that
the main round hatchway (Commander's position) does not line up with the circular mounting ring
that attaches the Turret to the Hull.  In fact you can see how the inner framework blocks a direct
line of sight through the hatch.



So, I had to come up with something different for an internal "former" structure.
Why do I need the internal structure? Because the paper wall construction is obviously not as thick
and rigid as the 4" thick cast metal turret.

And here is where my brainstorm comes in...I imagined a pair of flat plates, held together with a couple
of upright supports. it worked great...unfortunately the upper plate blocked the hatchway almost completely.
So a quick redesign, resulted in a three plate design that leaves the hatchway clear for stuff.

Uses the minimum amount of 1mm card with notches for all the uprights for added strength.



The Turret "skin" took a few reworks before I got to this final look.
The layout was simple enough once I analyzed the overall shape of the bare Turret.
First thing I need to let go of is the curves in the cast metal Turret. Turning everything into angled
connections between flat surfaces, simplified the whole design.
Theres a couple of tricky areas but most goes together quite easily. (Nine main parts build the turret.)



I also found I could put a lot of the curves back in once parts had been securely glued.  Just a case
of running a curved tool across the seams from the inside. Pressing hard against the cutting mat, most
of the joints are smoothed out and can be rounded quite easily.





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Dave Winfield

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Re: Centurion Tank
« Reply #52 on: September 26, 2013, 10:17:08 AM »
Turret Update continued...

once the former and "skin" are completed they are ready to "mate".
Simple fold over tabs will lock the skin to the bottom plate and the internal structure
is not a tight fit...just enough to hold the skin in the correct shape.



You can see I have also added the mounting rings.
This tabbed ring will fit into the tabbed hole in the Main Hull.
There are two rings provided, but you need to build up enough layers to create the necessary
thickness and offset of these rings.
Most annoying part was sanding the rings until they fit into the Main Hull opening easily.
But it was also important not to make the fit too sloppy, so it took time to get it just right.



And here it is...the basic cast Turret.
Obviously there are a lot of attachments and additional parts to go on. The Centurion has large
storage boxes attached around the Turret, hiding its true shape.
Next I will sort out the Gun Mantel...the goal is a tilting Gun, but I already see some of the internal
structure is in the way. So, it calls for some more brainstorming.







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Dave Winfield

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Re: Centurion Tank
« Reply #53 on: September 26, 2013, 10:18:51 AM »
last Turret update (for now)...

I am probably going to put the Turret aside now and go back to finishing the Exhaust system.
I've also got a few other Hull surface items to deal with.

In the meantime, heres a couple of shots of the bare Turret installed into the Hull.
yes, it swivels.


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Vermin King

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Re: Centurion Tank
« Reply #54 on: September 26, 2013, 10:33:12 AM »
Definitely a brainstorm there.  Coming together nicely. 
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