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Author Topic: T.A.R.G.E.T - Rotating Seven gun turrets?  (Read 14489 times)

raflaunches

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #300 on: April 08, 2017, 01:30:11 PM »

Hi C-3PO


I think that sounds right as 1/8" of an inch equals 12inches in 1/96 scale :-))
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Nick B

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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #301 on: April 08, 2017, 01:40:46 PM »

Hi Nick,

Thanks for the confirmation - I need to be more creative to get the size down of the goodies I am working on...
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #302 on: April 08, 2017, 01:58:10 PM »

Just picked up on your question C-3PO.   yes 1/8 inch at 1/96 scale.
At a pinch I could go up to 4 mm by having thinner barrels.  What do you have in mind?
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HMS Skirmisher (1905), HMS Amazon (1906), HMS K9 (1915), Type 212A (2002), HMS Polyphemus (1881), Descartes (1897), Iggle Piggle boat (CBBC), HMS Royal Marine (1943), HMS Agincourt (1912)

C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #303 on: April 08, 2017, 03:48:00 PM »

Hi Bob,

Keeping my matches dry for now but I do have one more question.

It looks from the crude measurement I made below that in this image the diameter of the gun barrel looks approx twice that of the calibre.

So 12" calibre approximates to about 24" diameter barrel - is my logic sound? and at scale OD of barrel approx 1/4inch?

Please note the screen ruler is using centimetres just because it was easy as the 8 cm mark aligned nicely ...

Thank you for your help

C-3PO
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #304 on: April 08, 2017, 04:35:36 PM »

Sorry C-3PO, I am stumped on that one.  Outside diameter does vary along the length though. 
At the muzzle 2 x i/Dia sounds about right

I always thought a gun of 12 inches was a measurement taken from the Shipwrights model, as to how much of it stuck out of the turret?   %%
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HMS Skirmisher (1905), HMS Amazon (1906), HMS K9 (1915), Type 212A (2002), HMS Polyphemus (1881), Descartes (1897), Iggle Piggle boat (CBBC), HMS Royal Marine (1943), HMS Agincourt (1912)

Colin Bishop

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #305 on: April 08, 2017, 05:35:37 PM »

Check out this link - it has a constructional drawing of a 12 inch gun of approx the right vintage:

https://commons.wikimedia.org/wiki/File:BL_12_inch_Mk_VIII_gun_diagram_Brasseys_1899.jpg

Click on the gun image for a larger view.

Colin
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ballastanksian

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #306 on: April 08, 2017, 10:28:06 PM »

Most British guns, and those inspired by our guns had a bell muzzle which neatly curved out of the taper gently to the muzzle. Other nations either had the taper straight to the muzzle or had a squared collar which looks awful in my opinion.
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Geoff

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #307 on: May 12, 2017, 02:29:10 PM »

I may be joining this debate a little last so apologies if this idea has already been suggested. On my Iron Duke I have five turrets and I linked all the aft facing ones together using mono filament fishing line as each sits on a drum. The drums are then winched round using a servo sized drum sail winch. The same for the forward turrets with a separate winch. With modern radio equipment you can control both the speed of rotation and the throw at each side. I control both groups separately (I have potentiometer pots to use on my system). Because the pull is on the circumference of each turret rotation is very smooth.


With Agincourt you could do the same which would mean all the forward facing turrets could turn to any position you want and if abaft the beam the aft turrets could be controlled to point in the same direction.


Absolute parallelism isn't needed on the pond because at any distance you just can't see that accurately. Because the groups are separately controlled I can fine adjust them for the centre line. I think an Arduino based system is probably the gold standard but this system works well enough and is easy to construct and maintain.


Hope this may be of help


Cheers


Geoff
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #308 on: May 13, 2017, 11:18:33 AM »

Hi Geoff,

The thread developed from the basic moving of turrets to something more ( see the detail in the posts) - Lots of "whistles and bells" functionality was added to the basic movement solution which perhaps pushed it in the direction of what might be considered the gold standard.

The movement of turrets only using stepper motors controlled with an Adruino compared to your solution would be comparing apples with apples

So I would suggest that the Arduino/stepper route is a quick and easy way to achieve the outcome without investing time and effort in R&D and fine tuning of the engineered solution to get it to do what you want.

In my simple world placing 7 steppers motors into holes cut in the deck, ( very similar to mounting 7 servos) supplying each with power and a data signal , plugging these into an Arduino which in turn is connected to the receiver seems more simple than to devise and install a turret mount and pulley system and all that entails to control multiple turrets.

I think the stepper motor route is like a "pre-made solution" and you just install components and connect them together where as your route is the "Scratch Build" route which for many of us is the more challenging route as in essence you start with a blank piece of paper and have to go through the same learning curve you experienced with any "funnies" to iron them out - How create a mount, , pullies, cord,  what amount of friction vs. slippage etc

Just my 2 pence worth - the good thing is  people have a choice and should they wish to "move their turrets" could use either of of the 2 routes or make their own hybrid - they simply have to choose which they think is easier to construct and the functionality they desire.

To enable others to use the stepper route if they want to - it is the intention to publish a "How to guide" at some point in the future which would detail all that's involved, the code , the components and you simply choose what functionality you want from basic movement of a turret through to target tracking, synchronised sound/light/smoke/gun recoil

Bob's HMS Agincourt build thread will give more detail as things progress - http://www.modelboatmayhem.co.uk/forum/index.php/topic,58070.msg605416.html#msg605416

Regards
C-3PO
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