Topic: Rotating turrets (Read 12954 times)

spooksgone · « **on:** June 04, 2012, 02:09:11 pm »

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

TailUK · « **Reply #1 on:** June 04, 2012, 03:29:02 pm »

Modified servos? Although how you wire them is a mystery to me.

howyson · « **Reply #2 on:** June 04, 2012, 04:02:03 pm »

Some info and links on modifying servos at:-

http://www.modelboatmayhem.co.uk/forum/index.php?topic=18707.msg335103#msg335103

Howard

deadbeat · « **Reply #3 on:** June 04, 2012, 04:14:31 pm »

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!

john44 · « **Reply #4 on:** June 04, 2012, 07:46:30 pm »

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

spooksgone · « **Reply #5 on:** June 05, 2012, 07:43:05 pm »

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.

Martin (Admin) · « **Reply #6 on:** June 05, 2012, 08:02:31 pm »

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!

spooksgone · « **Reply #7 on:** June 06, 2012, 08:48:39 pm »

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

Harquebus · « **Reply #8 on:** August 11, 2012, 04:22:13 pm »

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(?).

John W E · « **Reply #9 on:** August 11, 2012, 05:39:06 pm »

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

John W E · « **Reply #10 on:** August 11, 2012, 06:09:33 pm »

http://www.technobotsonline.com/servo-slower-by-alan-bond.html

aye
john

ACTion · « **Reply #11 on:** August 11, 2012, 07:38:05 pm »

http://www.action-electronics.co.uk/pdfs/P96.pdf
£14 built and tested..................oh, and with a case.
Suit yourself.
DM

bikerdude999 · « **Reply #12 on:** August 12, 2012, 09:26:18 am »

Quote from: bluebird on August 11, 2012, 06:09:33 pm

http://www.technobotsonline.com/servo-slower-by-alan-bond.html

aye
john

Looks good, might have to give 1 a go!

dodgy geezer · « **Reply #13 on:** August 12, 2012, 12:21:50 pm »

AFAICS, what it does is change the standard proportional servo control into 'progressive' control.

Anyone here old enough to remember that?

Circlip · « **Reply #14 on:** August 12, 2012, 12:23:46 pm »

"Wesclox" alarm clock conversion.

Regards Ian

ACTion · « **Reply #15 on:** August 12, 2012, 01:42:47 pm »

Quote from: dodgy geezer on August 12, 2012, 12:21:50 pm

AFAICS, what it does is change the standard proportional servo control into 'progressive' control.

Anyone here old enough to remember that?

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

).
Dave M

john44 · « **Reply #16 on:** August 12, 2012, 06:12:56 pm »

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.

ACTion · « **Reply #17 on:** August 12, 2012, 06:55:25 pm »

Quote from: john44 on August 12, 2012, 06:12:56 pm

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

dodgy geezer · « **Reply #18 on:** August 12, 2012, 07:40:03 pm »

One of my servos...

john44 · « **Reply #19 on:** August 12, 2012, 07:54:23 pm »

One of my servos... Thumbs up Thumbs up

1 of your servo,s

how big is the boat?

john

ACTion · « **Reply #20 on:** August 12, 2012, 08:25:48 pm »

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

Tug-Kenny RIP · « **Reply #21 on:** August 12, 2012, 08:35:45 pm »

Love it. All interesting stuff.

ken

dodgy geezer · « **Reply #22 on:** August 13, 2012, 08:22:43 am »

Quote from: john44 on August 12, 2012, 07:54:23 pm

1 of your servo,s 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...

spooksgone · « **Reply #23 on:** September 20, 2013, 10:31:06 am »

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

Geoff · « **Reply #24 on:** September 20, 2013, 01:36:49 pm »

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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