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My Beaut Aussie Cent

Forum for discussion relating to the Centurion
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Dennis Jones
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Re: My Beaut Aussie Cent

Post by Dennis Jones » Fri Jun 23, 2017 12:32 pm

Outstanding Stephen. Look forward to seeing it at Tankfest. Regarding the weathering just drive it through a muddy field and then a dusty one, then leave it out in the rain !!!

Dennis.

Phil Woollard
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Re: My Beaut Aussie Cent

Post by Phil Woollard » Fri Jun 23, 2017 5:37 pm

Looking excellent Stephen, you will have your work cut out weathering the ol girl, just remember to use a different thinner based system, one that won't remove the lovely British green (as if you didn't know lol ) :D , please send the new release photos from Bovi just as soon as you can for those that can't get there regards Phil.
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Steve Stuart
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Re: My Beaut Aussie Cent

Post by Steve Stuart » Fri Jun 23, 2017 11:07 pm

I agree with Dennis's suggestion as a good way forward, especially as you have had, hopefully, five years of family and friends going on holiday to Vietnam to have brought genuine, correct, mud back on their shoes for you to use 8)
As children now say, one more sleep until we find out, and if you are driving down tomorrow morning it is not going to be a long one.
Safe journey, see you tomorrow!
Steve

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Stephen White
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Re: My Beaut Aussie Cent

Post by Stephen White » Tue Jun 27, 2017 11:46 am

Thanks guys, appreciate your kind comments. It's been an intense couple of weeks to get her ready for TankFest but the sun shone, the battery lasted two days and she even acquired a coat of Bovvy dust - the wrong colour of course......

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Not much left to do now, searchlight, mantlet cover, fire extinguishers and weathering...

Stephen

Phil Woollard
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Re: My Beaut Aussie Cent

Post by Phil Woollard » Tue Jun 27, 2017 3:48 pm

And tighten the tracks! :) She does look lovely, just the running ground detritus in the running gear looks the part.....very nice.......Phil.
Mechanical engineer, Pyrotechnic technician, and small time farmer.
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Andreas Walter
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Re: My Beaut Aussie Cent

Post by Andreas Walter » Tue Jun 27, 2017 7:45 pm

Perfect Centuron, I have not yet seen a more beautiful tank.
Greetings Andreas

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Dennis Jones
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Re: My Beaut Aussie Cent

Post by Dennis Jones » Wed Jun 28, 2017 12:18 pm

The bridge looks pretty good as well !!!

Dennis.

Christoffer Ahlfors
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Re: My Beaut Aussie Cent

Post by Christoffer Ahlfors » Wed Jun 28, 2017 9:19 pm

Thank you Stephen for a fantastic build story! :D

Beyond being more exciting than any TV series, you have been very generous with sharing your experiences, knowledge and methods in detail. Documenting the build to this extent probably makes it take twice the time. In fact, it should be possible to copy your build, but I will bet that there are not too many around, who can possibly manage. :roll:

Words like stunning, deeply impressive, fantastic etc sound kind of thin after the eons of hours and episodes we have all followed, but what can I say - I am out of words... :shock:

Excellent leadership - thanks!
Klotzen, nicht kleckern (Guderian on panzer tactics, but the way I interpret it - it applies to a great many things in life)

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Stephen White
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Re: My Beaut Aussie Cent

Post by Stephen White » Sat Jul 22, 2017 10:20 pm

Thanks, very much appreciated, especially Andreas and Christopher. I hope it encourages more build logs and posts with substance on the Forum.
On with final details. I described the three types of AFV fire extinguisher used by the Australian Cents on page 20, here:

http://www.armortek.co.uk/Forum3b/viewt ... &start=285

In the period I'm portraying, 064 had three BCF type extinguishers.

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I did consider casting the extinguishers in resin but they're enjoyable to turn up, using a ball cutter on the lathe and the detail is relatively easy to make with brass.

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I then turned to the mounting brackets.

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For the cup which sits at the top, I used a dapping set. Dapping is simply a way of turning flat metal into a dome shape using special dies and punches. The dapping block has a series of concave depressions, each matched by a dapping die. The metal is annealed to soften it and placed over the block and the die is then tapped lightly with a soft hammer to form the depression. To form the draw (ie depth), the metal is cut oversize and successively smaller dies are used until the required shape is achieved. I also had to form two flanges, which were done by forming with a repousse hammer. YouTube inevitably has instructional videos on dapping but it isn't rocket science.

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I got the first flange a bit off centre to start with but it's easy to go back a step and re-form it accurately;

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Thanks for looking.

Stephen

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Re: My Beaut Aussie Cent

Post by simon_manning » Sun Jul 23, 2017 9:22 am

that was genuinely interesting, i did not know about a ball cutter for the lathe, and also that kit for making "dishes", metal bashing is not my strong point but superb information, regards simon.

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Re: My Beaut Aussie Cent

Post by Phil Woollard » Sun Jul 23, 2017 9:37 am

Stephen
It looks to me like you could do with a "fly-press" .
It's possible to use a good pillar drill to do the same job, so long as its of the heavy duty variety. A fly-press is a wonderful tool for cutting, broaching, bending, forming, extruding and I dont have one! Nice work ....Phil.
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Stephen White
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Re: My Beaut Aussie Cent

Post by Stephen White » Sun Jul 23, 2017 9:52 am

Thanks guys, glad to share knowledge acquired by trial and error.

Phil, I have a half ton fly press, which doesn't get much use. I'm not sure which bit of the process you thought could be done on a pillar drill?

The secret of dapping is to have a large selection of punches and dies, each incrementally smaller than the last, so that the metal can be formed in small stages, to achieve the required draw. My set for example has 36 punches, ranging from 24.5mm to 3.5mm. You can do with a much smaller set but chances are, it won't have just the size you need. I also find that it's trial and error to gauge how much oversize to cut the blank for a given diameter and depth. There must be engineer's tables to calculate the answer but life's too short.....

Stephen

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Stephen White
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Re: My Beaut Aussie Cent

Post by Stephen White » Sun Jul 23, 2017 10:18 am

Simon, ball cutter vids (posh name is "radius cutting attachment").

Proxxon, the one I have:

https://www.youtube.com/watch?v=VRCUe8xfVec

Cutting demo (health warning about the muzak):

https://www.youtube.com/watch?v=tbvOb-tTNyc

Regards

Stephen

Fabrice Le Roux
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Re: My Beaut Aussie Cent

Post by Fabrice Le Roux » Sun Jul 23, 2017 10:22 am

Hi,
Lovely job Stephen. Dapping will rapidly work-harden the annealed blank, so worth annealing at each stage to reduce risk of splitting the edge.
Simon, disc-cutters and dapping/doming sets can be found at jewelry suppliers rather than from the usual model engineering bods.
cheers
Fabrice

Phil Woollard
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Re: My Beaut Aussie Cent

Post by Phil Woollard » Sun Jul 23, 2017 11:11 am

Extrusion tables, tricky stuff,you can use a pillar drill to press down true and straight, it does not need to be turning, I suppose that's why they are called a drill press, I will shut up now lol :D
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