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Author Topic: T.A.R.G.E.T - Rotating Seven gun turrets?  (Read 84606 times)

Geoff

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #400 on: June 14, 2018, 03:54:09 PM »

Interesting, how much power do the small stepper motors give compared to the larger version? miniaturisation is key these days!

Cheers

Geoff
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #401 on: June 15, 2018, 01:34:16 PM »

Interesting, how much power do the small stepper motors give compared to the larger version? miniaturisation is key these days!

Cheers

Geoff
Hi Geoff,

Re the micro stepper - not sure what the power output will be - not a lot - I have just realised that the one I have does not have a gear box so all but useless...

So same motor can at the bottom but metal gear box inside plastic casing



I have ordered a couple of ones with metal gearboxes - once I know more I will update you

C-3PO
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #402 on: June 27, 2018, 12:13:35 PM »

Geoff,

These just arrived - must have been on the slow boat from somewhere - initial results are that they have quite high torque

I'll update you when I know more...



C-3PO
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #403 on: June 27, 2018, 02:40:17 PM »

Now this gets interesting.  Those steppers are truly tiny compared with mine.  I guess you intend them for your HMS King George V.  I wonder if they would drive my Agincourt turrets?
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #404 on: June 27, 2018, 03:33:57 PM »

Hi Bob,

Yes I want them for KGV secondary armaments - I will still use 28 BYJ 48 steppers (same as your HMS Agincourt)  for main 3 turrets unless these new ones prove to be man enough - the 28 byj 48's are Unipolar - these little blighters are Bipolar so more grey cell being expended on learning - love it!

I have just ordered some even smaller steppers (0.20p each) that I think either came out of a hard drive, cd drive or maybe a camera (autofocus) - when you scratch the surface you find stepper motors popping up in all sorts of places - they where used (still are in many cases) for dashboard dials ( speedo/ rev counter etc) in cars

Regards
C-3PO
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #405 on: June 28, 2018, 08:03:43 PM »

Still refining smoke production

https://youtu.be/ncedtQVQ5-w

C-3PO
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #406 on: June 30, 2018, 04:20:06 PM »

Micro stepper test - this little motor has got some guts!!!

https://youtu.be/g1PAcsJ6Eok

C-3PO
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tsenecal

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #407 on: June 30, 2018, 08:31:03 PM »

C-3PO...


do you have any links to both the micro stepper motor and the motor driver you are using?
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #408 on: June 30, 2018, 09:27:10 PM »

Hi tsenecal,

I intend to use them on secondary armaments on a KGV

I got mine from eBay uk - I don't think they are new - I think they have seen life in another piece of kit

You will find them with varying gearboxes - but the metal motor can is the same, no doubt produced by the tens of thousands

Google - 15mm Body Geared Micro Stepper Motor and you will find them or maybe  15BY25 - just make sure they come with the gearbox or they are useless

EG - https://www.alibaba.com/showroom/15mm-stepper-motor.html

http://www.dx.com/p/5v-micro-angle-high-torque-15mm-2-phase-4-wire-stepper-gear-motor-white-363007?m=0

I am using a basic Adafruit motor control shield as I had one already - can use any simple cheap bipolar stepper driver - perhaps Pololu or Easydriver

In the video they are running on a 3v supply

Hope that helps

C-3PO
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Capricorn

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #409 on: August 25, 2018, 05:17:06 PM »

See video of an operating compass directed fire control for RC:

https://www.youtube.com/watch?time_continue=196&v=mgtidK7LFhA

It generally does or can do what I think the target system is intended to accomplish minus a bell and whistle.  I conversed with dreadnaught quite some time ago about this and worked on it for a while concurrently.  It's currently being installed on 1/200 Bismark.  The standard 28 BYJ 48 motors work just fine for this application, and the function is rudimentary, the director is governed by the compass and the turrets simply follow the director as programmed.

The target system needs a "shot in the arm" so to speak, it's been a long time and seems to have stalled, I'd like to see it concluded.  Best wishes, Cap
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #410 on: August 25, 2018, 06:07:48 PM »

Fear not, the system development will be back underway shortly I am assured.

The original plan to get it fully working for Wicksteed was highly optimistic, bearing in mind the ship and the electronics test rig being a hundred and fifty miles apart until that day.  We did get about 60% of it installed but ran out of time.  What was installed did work, although the wiring needs a lot of tidying.

I have every confidence in C-3PO who has put a huge amount of time and resources into this.

Q:  How long did it take to commission HMS Queen Elizabeth?  Getting electronics to successfully interface with ship hardware is not the five minute job of fitting an ESC.
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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #411 on: August 27, 2018, 10:25:04 PM »

Who's Wicksteed?  Haven't seen any posts by him/her  ;) .  Cap



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mrlownotes

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #412 on: August 27, 2018, 11:27:58 PM »

Who's Wicksteed?  Haven't seen any posts by him/her  ;) .  Cap


I see that Bob's wording may have suggested it, however Wicksteed is not a person but the location of a very prestigious annual model boating event in the UK.
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #413 on: August 28, 2018, 11:32:43 AM »

Sorry mrlownotes.   This is Model Boat Mayhem, and Wicksteed Park is this forum's major national event.
We were hoping to have the TARGET system running for the event, but ran out of time.

More news will follow . . .
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #415 on: March 26, 2019, 10:02:56 PM »

Just started installing the TARGET system in this beauty so maybe some more smoke on the water at this years Model Boat Mayhem weekend @ Wicksteed Park



Also hopefully Bob's amazing HMS Agincourt will be on display sporting the all singing and dancing version of the TARGET system.

C-3PO
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #416 on: March 27, 2019, 01:08:32 PM »

Looks good.  What scale (size) is she?   "Only" 3 turrets to turn  :-))
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #417 on: March 27, 2019, 05:52:42 PM »

Hi Bob,

Fleescale hull - 1/128th 69" (1.76m)

And yes "a walk in the park" ONE hull to run cables end to end and just 3 turrets but the little guys on the side are trying to get my attention hence I am investigating some small steppers

C-3PO






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ballastanksian

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #418 on: March 27, 2019, 10:05:31 PM »

I have never liked this class as much as her older cousins, but they still make beautiful models, especially well executed ones like this  :-))
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #419 on: April 20, 2019, 06:35:17 PM »

Hated geometry at school - hate it even more now!

https://youtu.be/xKrzl6cJadU

Trying to make a shore based visual feedback system for the TARGET system - (note this is a demo only not using real data so the behaviour of the hands is not what you may expect)

The intention is one hand would indicate the heading selected via the pot know on the RC TX and the other hand would indicate the current position of the gun turret...

A few more whistle and bells up my sleeve....

C-3PO
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #420 on: April 20, 2019, 08:43:24 PM »

Neat video clip, but not sure I understood what was happening there ?
There will of course be a lag between bearing with changing ships position, and turret coming round to try and keep on target.  Of course there will oft be desired turret orientations in which the guns cannot bear.
However, both pointers seem disinclined to match up into correct bear/fire angles.
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #421 on: April 20, 2019, 09:10:40 PM »

Hi Bob,

Your observation is spot on - that's why I posted the text

"note this is a demo only not using real data so the behaviour of the hands is not what you may expect"):)

C-3PO
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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #422 on: April 20, 2019, 10:20:04 PM »

Sorry Sir, I was just trying to figure out what you were doing  %%
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C-3PO

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #423 on: April 21, 2019, 08:51:49 AM »

Hi Bob,

Apologies - it would be more like this although slower in movement

https://youtu.be/8J8DiYPbGCk

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Bob K

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Re: T.A.R.G.E.T - Rotating Seven gun turrets?
« Reply #424 on: April 21, 2019, 03:50:31 PM »

Now that looks the biz'   :-))
Realistic tracking of turret as ship turns and guns attempt to bear on target. 
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