Topic: radar drive!! (Read 10479 times)

chromedome · « **on:** August 29, 2006, 04:35:16 pm »

I have converted a servo to turn 360,but not quite sure what i need to connect a drive shaft to it...its for a 1960 1/96 scale Tribal....if someone could point me in the right direction please?

colin-stevens · « **Reply #1 on:** August 29, 2006, 08:42:10 pm »

find a screw that fits the hole where the horn used to go. fix this screw into into a tube long enoughto go where you want. screw this into the servo and bobs youre aunty.
colin

Shipmate60 · « **Reply #2 on:** August 29, 2006, 09:10:58 pm »

I put a servo driving my main Radar on a Tribal.
Wot a racket, even heavily greasing the gearbox didnt make much difference.
Model Motors Direct have some small geared motors or some on ebay.
Just a tip, if you find some buy a few, I am down to my last 2 small swiss motors, I bought 10!!

Bob

HS93 (RIP) · « **Reply #3 on:** August 29, 2006, 09:34:45 pm »

Bob try

http://www.fastcomponents.co.uk/ they do lots of small drives Peter

HS93 (RIP) · « **Reply #4 on:** August 29, 2006, 09:52:05 pm »

NO it was directed to the person who said he was down to his last two, chromedome already has one..Peter

chromedome · « **Reply #5 on:** August 30, 2006, 07:05:29 pm »

OK folks...thanks so much for that.

George

colin-stevens · « **Reply #6 on:** August 30, 2006, 07:42:36 pm »

dont know how you are getting noise, mine have always been quiet.

Shipmate60 · « **Reply #7 on:** August 30, 2006, 09:04:32 pm »

Paul,
Ships radar motors are quiet, there is surprisingl little noise on board a running ship outside the Main Engine and Generator noise frequency range.
You can hear intermittant punp motors start from several decks away.

Bob

Shipmate60 · « **Reply #8 on:** August 31, 2006, 11:43:52 pm »

Should kick the maintainer then!!

Bob

Barthez · « **Reply #9 on:** September 01, 2006, 11:31:21 am »

Quote from: shipmate60 on August 30, 2006, 09:04:32 pm

Paul,
Ships radar motors are quiet, there is surprisingl little noise on board a running ship outside the Main Engine and Generator noise frequency range.
You can hear intermittant punp motors start from several decks away.

Bob

It would depend on the type of ship I suppose but warships do have a lot of stuff on hem to make niose. I did 8 years on type 42 destroyers, the engine intakes and engine room vents are very noisy, stood on the fo'cle is fairly quiet but you can hear the roar of the intakes at almost any position, especially at speed. If at action stations you have all four diesel generators and both olympus engines sucking in and expelling air, hydraulic pumps for the launchers etc. The general rumble of the ship at anything above a few knots is quite loud.
I dont mind a my radar motors making a little noise, my ESC's tend to make a bit of noise at slow speeds but as soon a it's a few feet away you can't hear it.

just my 2p worth
bart

grasshopper · « **Reply #10 on:** September 01, 2006, 11:15:34 pm »

Rather than use a converted servo, an easy solution once seen in one of the boat mags was a friction drive, rubber driven wheel and just the motor shaft rubbing against it.
easier to align, quiet and cheap

chromedome · « **Reply #11 on:** September 02, 2006, 09:37:49 am »

I like that Grasshopper....i might even think of using two little velcro discs??

cbr900 · « **Reply #12 on:** September 03, 2006, 09:49:07 am »

I found the servo option worked quite well but was very noisy, so I obtained several dead vcr machines from the local repair shop and use the small drive motors found within, work perfectly quite and use very little power when operating..

Roy

Craig Kane · « **Reply #13 on:** September 03, 2006, 02:09:26 pm »

You could always buy yourself some dwarf hamsters and install a little wheel in side your boat.......... ::) ::) ::)

grasshopper · « **Reply #14 on:** September 03, 2006, 10:29:24 pm »

The friction drive idea came from one of the magazines years ago.... maybe I should be called squirrel and not grasshopper - I have a double garage full of 'stuff'
I tend not to throw anything away until I've stripped it to see if it's got anything useful.

One of the best places for friction drives are old cassette and micro cassette players, include walkmans etc - also old cd drives etc.

the velcro discs might not be that good though, and the 'ripping' noise might be a bit off putting.....

maande · « **Reply #15 on:** October 19, 2008, 01:43:46 pm »

A kind of candy sell in some sweet shop. It is a ball type and a stick fix with a handle, use a AA battery that the candy will rotate .

Ghost in the shell · « **Reply #16 on:** October 19, 2008, 02:14:05 pm »

Quote from: colin-stevens on August 30, 2006, 07:42:36 pm

dont know how you are getting noise, mine have always been quiet.

depends on the servo.

I have one servo modded as a winch (futaba 3003) and another servo for a radar, (un branded out of rtr model) operating on 2 cells. the radar servo is several times noisier than the winch servo, so i suppose it is down to the individual make of servo.

that aside, having stood on the deck of the now closed exhibit HMS Plymouth whilst it was open, they ran the large sweep array atop the mast head and it was quite noisy

Sandy Calder · « **Reply #17 on:** October 19, 2008, 02:32:44 pm »

Cassette tape motor.
Has a speed adjuster on the case.
They are so quiet you cant hear them.

FullLeatherJacket · « **Reply #18 on:** October 19, 2008, 08:09:54 pm »

http://www.action-electronics.co.uk/pdfs/M7G.pdf

We sold 23 of these just this weekend..............works for someone?

Suiit yourselves.

FLJ

Sandy Calder · « **Reply #19 on:** October 19, 2008, 09:00:15 pm »

Hi FLJ.
Yass!
There is a mistake in the first diagram in the pdf link. PM coming!!!
There is also an opportunity to sell an LM317 with each of these motors on 4-12 volts.
Current mode might be best.
Who cares to try?

Regards
Sandy Calder

FullLeatherJacket · « **Reply #20 on:** October 20, 2008, 09:04:33 am »

Quote from: Sandy Calder on October 19, 2008, 09:00:15 pm

Hi FLJ.
Yass!
There is a mistake in the first diagram in the pdf link. PM coming!!!
Regards
Sandy Calder

Now sorted! Thanks, Sandy.
FLJ

Sandy Calder · « **Reply #21 on:** October 20, 2008, 10:33:44 am »

For those that demand radar rotation at 14.4 RPM ,or whatever,a minimum of three components will maintain that rate.

D1 - D3 are to protect the LM317 regulator.
The LM317 is all that is required for a fixed 1.25 volts
For more information on the LM317 voltage regulator see http://www.national.com/ds/LM/LM117.pdf

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Author Topic: radar drive!! (Read 10479 times)

Barthez

maande

Sandy Calder

FullLeatherJacket

Sandy Calder

FullLeatherJacket

Sandy Calder