Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Navy - Military - Battleships: => Topic started by: spooksgone on June 04, 2012, 02:09:11 pm
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Hi all. My next project is going to be a scale shipyard 1/48th Fletcher class destroyer. At nearly 8 feet long it will be crying out to have as many working functions as possible. Does any body know the best way to make the gun turrets rotate? I am starting to gather the parts for this build all ready.
Cheers all
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Modified servos? Although how you wire them is a mystery to me.
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Some info and links on modifying servos at:-
http://www.modelboatmayhem.co.uk/forum/index.php?topic=18707.msg335103#msg335103
Howard
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Try this from Action Electronics.
http://www.action-electronics.co.uk/mixers.php
look at Servomorph
I haven't used it yet but may well do in the future sounds just right for the job!
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Hi deadbeat, you can use standard un - modernized servo,s or mini/micro servo,s . You just fit a pulley on the servo & a pulley under the turret.
The pulley on the servo needs to be 5 times the size of the pulley on the turret to give the angular degrees needed. I use this set up on my PT15 through a ACtion servo morph to slow the servo,s down, and both guns work of 1 servo-morph
via a Y lead.
If you mount your servo/pulley in between 2 gun,s to get them to turn the same way you will have to put a twist
on the rubber band to one of the guns.( like a figure 8 ).
hope this helps
john
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Just had a thought, I remember building the Nichiomo 1/200th scale Yamato, back in the early 80's the turrets where all contrlled by a simple motor and a cam type system. Failing that, back to a simple push rod system. wow, how time moves on.
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Just make sure you use quality servos, bearings etc. as with age and wear, they will get all 'juddery' and look terrible when moving!
Smooth, smooth, smooth!
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Thanks for all of the info guy's. lot's of food for thought. It looks to me that the servomorth might be worth a look, thank's Deadbeat.
Thank you all
Phil
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Seems all the rotating turrets I have seen are servo controlled with linkages and pushrods and have to be operated with a slow thumb to replicate the slow, smooth and heavy turning seen on the real warship. Furthermore, the turrets return to "neutral" when the stick is released. Is there a way to have a turret rotate to a certain point and stop there?
Those RC tanks have that function and one can drive around with the turret "stuck" at a certain angle until one moves it again. Not sure what the servomorph does; perhaps I need to look in that direction(?).
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hi there
this may be of interest to some requiring rotating turrets and cranes etc. I have just finished a kit which I bought from Technobots - its for a servo expander - its called a servo control unit. It increases the standard servo movement to 180 degrees but also it has the option where you can move the servo to any position on the 180 degree arc and when you have reached the point you want the servo to finally be at; you then release your tx control stick to central position and the servo will stay at that fixed point which you left it at - until which time you move the tx stick back to that position - then the servo will move.
the only downside to this, as far as I am aware - Technobots only do this item as a kit as far as I can see and I would class it as a kit for the experienced Electronics person as it is built on strip board - there is no resistor colour coding write-up (you have to know your resister colour codes/which you can get from the web) and you have to do a lot of link wiring on the board as well as strip cutting.
The other thing is you have to pay extra for a case, which I didnt realise at the time - but - for £12 (without the case) not bad I s'pose.
I will put a link on shortly.
aye
john
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http://www.technobotsonline.com/servo-slower-by-alan-bond.html
:-))
aye
john
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http://www.action-electronics.co.uk/pdfs/P96.pdf (http://www.action-electronics.co.uk/pdfs/P96.pdf)
£14 built and tested..................oh, and with a case.
Suit yourself.
DM
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http://www.technobotsonline.com/servo-slower-by-alan-bond.html
:-))
aye
john
Looks good, might have to give 1 a go!
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AFAICS, what it does is change the standard proportional servo control into 'progressive' control.
Anyone here old enough to remember that? :D :D
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:-)) "Wesclox" alarm clock conversion.
Regards Ian
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AFAICS, what it does is change the standard proportional servo control into 'progressive' control.
Anyone here old enough to remember that? :D :D
Throttle and elevator trim servos with seven wires? Reed banks? Six-lever trannies? Centre-tapped DEAC packs? Oh yes, quite old enough thanks.............unfortunately (and so are you, D-G :P).
Dave M
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I havent got a clue what you are on about, a reed bank is on the sides of the lake isnt it?
as for the rest they could have found it on Mars.
just shows Im young or just late into RC. {-) {-)
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just shows Im young or just late into RC. {-) {-)
Or both! Never mind. If you really want to know about that sort of stuff I'm sure there's plenty on t'interweb about it. "You young buggers don't know you're born......"
DM
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One of my servos... :-)) :-))
(http://s15.postimage.org/di71gz7tz/IMG_4543.jpg) (http://postimage.org/image/di71gz7tz/)
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One of my servos... Thumbs up Thumbs up
1 of your servo,s :o how big is the boat? {-) {-)
john
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Blimey - a Mighty Midget! I made a Galloping Ghost servo from one of those - worked a damned sight better with our Fleet GG set than the fancy Rand LR3 and cost about a fifth as much.
(Note to Forum Ring Wraiths/Nazgul/Death Eaters/Moderators:
Sorry to go off topic but it does seem to have run its course. You'll forgive a couple of old f^rts from reminiscing, surely? If not, Duramites to the lot of you!)
Dave M
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Love it. All interesting stuff.
ken
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1 of your servo,s :o how big is the boat? {-) {-)
Sea Rover at 30" - old-fashioned radio installations used to fill a boat from stem to stern, usually with multiple batteries and mechanical contrivances...
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Well I finally got around to buying a servo morph from the components shop, Installed it in my v+w [rear turret] and it works a treat. Certainley will be getting some more for my next project.
Thanks guy's
Phil
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Quick question though, does it actuially allow 180 degrees rotation or a little less? The info seems a little contradictory, so really the question is for someone who has actually purchased it.
Also is the movement smooth or a little jerky?
Looks really interesting and easier than my method. (see Warships underway "how too page")
Cheers
Geoff
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It depends on the servo. If it has physical stops on the gears it probably won't go that far. If you want 180 degrees or more get a sail winch servo and use the servomorph to stop it travelling too far. Component shop have some sail winch servos that are about the same size as a standard servo and are cheap. It works smoothly for me.
Regards,
Roger.
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Well I finally got around to buying a servo morph from the components shop, Installed it in my v+w [rear turret] and it works a treat. Certainley will be getting some more for my next project.
Thanks guy's
Phil
Can I get a demonstration of that? O0
So this enables a full broadside and can leave the turret there until you center them again?
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my solution for Tiger is to use a gear wheel and turret drive from 1/16 scale tank, no wires to worry and it will trav as slow or fast as you want without the need for servos
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my solution for Tiger is to use a gear wheel and turret drive from 1/16 scale tank, no wires to worry and it will trav as slow or fast as you want without the need for servos
Well, the turrets from 1/16 tanks (Heng Long being a favorite) have a set speed and so should the warship in question. A slow, lumbering speed would be best. For smaller scales or width concerns in our slender battlecruisers and destroyers, I don't think the retrofitted turret ring from a HL tank, et al, will always fit.
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reversible motor with a worm drive to a turret ring maybe (a good worm drive can be found on telescope mounts) motor can be run from a speed controller or a pair of microswitches.
Grendel
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I have one in my 'Dorina' on the 4" turret.
It only rotates about 160 degrees but that might be because it's driving a 1980's 'Sanwa' servo. Quite smooth.
On my Patrol Boat I used a miniature 'Robbe' 1:500 motor driven by a Mtroniks 10 amp speed control which means it can turn at any speed over 360 degrees. "Watch out on the Bridge"
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Well, the turrets from 1/16 tanks (Heng Long being a favorite) have a set speed and so should the warship in question. A slow, lumbering speed would be best. For smaller scales or width concerns in our slender battlecruisers and destroyers, I don't think the retrofitted turret ring from a HL tank, et al, will always fit.
Its not the whole turret ring just the gear wheel which fits under deck, on Tiger plenty of room and bearing in mind the 6" turret is mounted well forward
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http://www.modelradioworkshop.co.uk/products/turret-servo-controller
Very good, does what the Technobots one does, but its built. Only does 160 degrees, but has a servo slow down built in too. Got one its great. Didn't respond earlier, too busy slapping my head with my hand repeatedly :-)) Actually, only just looked at the post :embarrassed:
Check out his range...good gear.
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Hi.
Turret rings here for ships
frank
http://stores.ebay.de/mgs-mechanics?_trksid=p2047675.l2563 (http://stores.ebay.de/mgs-mechanics?_trksid=p2047675.l2563)
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One of my servos... :-)) :-))
(http://s15.postimage.org/di71gz7tz/IMG_4543.jpg) (http://postimage.org/image/di71gz7tz/)
Where does the steam go, Grandad?