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>> Home > Forum > For Sale/Wanted > Working radar
Working radar
(1910 views)
Author Message
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
27th Jun 2017 03:54  
>> Permalink
mdlbt.com/30673

Hey guys!!!
I'm looking on the web to find a way to build a working radar for my 1/32 Statia Relaint tug.
I don't like the idea of feeding the radar movement from the bottom with a rod but rather with pulleys or a micro motor with low rpm that would fit under the radar base.
(Third photo to the right).
By the way, the radar base will be aproximatly 3/4"-12/16"
I know you guys have,the answer to any of our rookie questions.
Thank you for your anticipated cooperation.


Attached Files - Click To View Large

none
(Fleet Admiral!)





Forum Posts: 185
27th Jun 2017 09:18  
>> Permalink
mdlbt.com/30675

I think there is some sort of servo that does it.

An internet search for rc model boat radar servo may help.

Dave M
(Fleet Admiral!)





Forum Posts: 1399
27th Jun 2017 11:01  
>> Permalink
mdlbt.com/30677

Hi chugalone100
It would appear you have already worked out that some sort of pulley may be an option. Angled small gears may also work but there may not be the space available and you would probably need to make your own.
I did buy from http://www.gizmoszone.com/ some very small (6mm) planetary geared motors that run on 3volts and are certainly suitable for your purpose via a pulley system. Using 1.5 volts gave a very realistic speed.
Using one of these motors should allow you to use two small pulleys on the mast, where I suspect space will be limited. I would make sure you will always have access to the pulleys and belts as they will almost certainly need servicing over time.
Hope this helps and please post details of the setup.
Dave


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
27th Jun 2017 11:02  
>> Permalink
mdlbt.com/30678

Hi Chugalone,
Have a look at this, describes 3 solutions. #3 using two pulleys is the best if you want to hide all the works, but more fiddly to build.
Happy fiddling, Doug 😎
http://www.shipmodelers.com/uploads/3/2/2/2/3222171/workingr...


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
27th Jun 2017 11:19  
>> Permalink
mdlbt.com/30679

Just looking at the website my motor was the GH6124s, use the search box on the site. This motor doesn't seem to show when I looked
Dave


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
27th Jun 2017 13:18  
>> Permalink
mdlbt.com/30683

Hi all, for my MS Hotspur radar (mounted on the gun director tower above the bridge) I used an old linear servo, God knows where it came from or who made it! I just disconnected the feedback pot and fed the motor with 1.5V, D-size alkaline cell, which drove it at about 2 RPM and lasted for years! 😊 I know, it should have a Yagi array sticking out the front! First the motion - then the detail 😉 Cheers Doug 😎
PS Crewman swabbing the deck has been shanghaied from Monty's 8th Army. I converted his minesweeper to a broom 😉


Attached Files - Click To View Large


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
27th Jun 2017 18:37  
>> Permalink
mdlbt.com/30690

Dave:
What a place to find gizmos.
I love the store, and I think they have what Im looking for.
And thank you for sharing the motor numbers.
You guys are too much.
Thanks
Julian

chugalone100
(Sub-Lieutenant)





Forum Posts: 18
27th Jun 2017 18:39  
>> Permalink
mdlbt.com/30691

Doug:
I have seen this website.
Very little information about the gears he used.
But is a place to start planning the way I will build my antenna.
About the servos, I found a mini servo with continuos rotation on eBay and thats another option Im looking at.👍
Thank you
Julian

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
27th Jun 2017 19:07  
>> Permalink
mdlbt.com/30692

Great, so now you've seen the pissobolities 👍
You pays yer money - you takes yer choice! 😉
Odd, Dave's link wouldn't work for me!? 🤔
Cheers Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
27th Jun 2017 19:39  
>> Permalink
mdlbt.com/30693

Doug
Just Google it. Probably your authorities imposing their will again
Dave


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
27th Jun 2017 19:48  
>> Permalink
mdlbt.com/30694

Hi Dave, I did! Same result no matter which link i tried - Timeout'! 🤔😭
Ho Hum! I'm obviously not meant to know 😉
Never mind I have sources of micro motors over here.
Have already bought several for the planned Plastic Magic projects.
All the best, Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
28th Jun 2017 09:57  
>> Permalink
mdlbt.com/30710

Oh dear
Could be to do with the EU fining Google. Have you tried another search engine?
There is a pdf file of all the geared motors on the site so I will send you a pm.
Cheers
Dave


Live long and prosper

Dave
chippy
(Chief Petty Officer)





Forum Posts: 20
28th Jun 2017 13:23  
>> Permalink
mdlbt.com/30717

Hi Chugalone
Chris Brown used to do a very small motor ideal for radars working on about 1.5 to 3 Volts. You may be able to hide it in the base of the radar bottom piece. I looked on his site but couldn't see them, he usually has them at various shows. give him a phone call for details.
http://www.christopher-wyn-brown.co.uk/
Hope this helps.
regards
Mike

chugalone100
(Sub-Lieutenant)





Forum Posts: 18
29th Jun 2017 22:34  
>> Permalink
mdlbt.com/30770

David:
According to the specs given about the motor your recommended (GH6124s) it said that it will turn 5000rpm.
Isn't that a bit too fast for a 1/32 radar?
Maybe I'm not understanding something here.

Julian😎
"There is more happiness in giving than there is in receiving."

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 07:40  
>> Permalink
mdlbt.com/30775

Even 31000 rpm depending on model and voltage! And without gearbox!!!
BUT, if you choose the right one, with gear ratio 699.55 to 1 then you can get it down to 14 rpm or less. 😊
Moral: read the whole sheet! 😉
Cheers Doug 😎


Attached Files - Click To View Large


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
30th Jun 2017 09:14  
>> Permalink
mdlbt.com/30779

Hi Julian
As Doug has already commented this is a very small coreless geared motor that reduces the revs down to slow speeds. They are incredibly small powerful and quiet. I have a stripped down minature servo in my Trent lifeboat which gives the required speed but it is exceptionally noisy, especially when used in a display environment.
This motor is the best I have found on the market and is certainly suitable for your purpose.
I do hope you manage to find the solution for your radar and that you share how on the forum.
Cheers
Dave


Live long and prosper

Dave
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 17:29  
>> Permalink
mdlbt.com/30795

Thank you Dave and Doug.
Now I understand.
As you guys have notice, I will rely on your experiences to set up all the electronics.
I'm still working on the structure but thinking ahead to know how to build around the electronics.
Whenever I see that I'm asking dumb, irritable questions, I will stop.
Hoping I will never exhaust you guys.

Julian😎
"There is more happiness in giving than there is in receiving."

Midlife306
(Fleet Admiral!)





Forum Posts: 144
30th Jun 2017 17:39  
>> Permalink
mdlbt.com/30798

Yup, well that's what the wife says🤔

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 17:43  
>> Permalink
mdlbt.com/30799

Which Wayne?
Dumb questions?
Giving / receiving?
or 'never exhaust' ?? 😉😉
😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
30th Jun 2017 18:40  
>> Permalink
mdlbt.com/30802

Hi Julian
Please keep asking your questions. As a newbie you may well not understand everything we explain. You will not be alone so by asking questions there may well be others who will benefit from further advice and clarification.
The more people we can interest in our hobby the better and I am more than happy to give help and advice.
Best wishes
Dave


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 18:52  
>> Permalink
mdlbt.com/30803

I'll second that 👍😊
Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 19:45  
>> Permalink
mdlbt.com/30805

Doug:
I enormeously appreciate all of your advises that everyone has given me in this place including yours.
Maybe because I come from another culture (Cuban) very much different from yours, sometimes I have said or posted something that to you, it might not make any sense. I'm sorry, I'll try better next time.

Giving / receiving?:

The wisest man who ever lived said: “There is more happiness in giving than in receiving.” Do you believe in this principle? If so, then perhaps you have wondered what kind of giving is the most valuable. What kind of giving really produces that deep sense of happiness that eclipses receiving?

or 'never exhaust' :

v. ex·haust·ed, ex·haust·ing, ex·hausts
v.tr.
1. To make extremely weary; wear out. See Synonyms at tire1.
2.
a. To remove a resource from; deplete: tobacco crops that exhausted the soil of nutrients.
b. To use up completely: a costly project that exhausted our funds. See Synonyms at deplete.
3. To discuss or treat completely; cover thoroughly: exhaust a topic.



Julian😎
"There is more happiness in giving than there is in receiving."

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 20:46  
>> Permalink
mdlbt.com/30808

Hi Julian, Don't panic ! My comment above was a stupid joke directed at Wayne (Midlife306) and his comment about what his wife always says! 😎
No reflection at all on your posts or questions intended. Just my weird British sense of humour 🤔 Similar to Wayne's!
By the way: complementos on your English 👍 Much better than my Spanish, despite having worked with South American navies (mainly Brazil (Portuguese I know!), Chile and Ecuador) for several years.
"It is better to give than receive" and
"It is better to travel hopefully than to arrive!"
I just realised that you are in Dade County FL 👍 Nice place to live, haven't been there for years but liked it very much in the nineties; Hurricane Andrew and all that.
Still have the 'I survived Hurricane Andrew' T Shirt!
Saludos Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
DennisRobotham
(Sub-Lieutenant)





Forum Posts: 12
30th Jun 2017 20:50  
>> Permalink
mdlbt.com/30809

Hi Chugalone 100, i have an 8' 6" long model of HMS Fearless with the servo in the mast running two radars at different speeds via pully and elastic bands, works well since the launch six years ago.
If you make your mast a lift of fit at the radar arm you can mount the servo in the main part of your mast, micro servo from Rapid electronics in Colchester for £4.20.. good deal and excellent.

Good look with model👍😊


Dennis G.V.M.B.C
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 22:06  
>> Permalink
mdlbt.com/30815

Doug:
Hurricane Andrew??
WOW
During those years I had a small carpentry business dedicated to the selling, finishing and installing doors, so I was booked with work for an entire year.
Made so much money, bought a good house, and now is paid for.
Again “Gracias” for every input from all you guys.

Julian from Sunny 😎Miami (The ethnic soup capital of the world).

chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 22:25  
>> Permalink
mdlbt.com/30816

Dennis:
Thank you for your feedback about the radars.
I believe you have your pulleys hidden under the pilots cabin.
I have very little room for that type of set up, so I think the best way is to purchase the small motor that Doug recommended without any mayor wiggling.
Show me some pictures, or I believe I have seen your set up in this forum.

Thank you
Julian😎

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 22:27  
>> Permalink
mdlbt.com/30817

'It's an ill wind that blows nobody any good'!! 👍👍😁
I was peed off then cos Andrew meant that the Everglades and Keys were closed off which meant that my plan to drive right down the Keys went down the tube 😭
So instead I headed North, also interesting, and drier 👍😊


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 22:36  
>> Permalink
mdlbt.com/30818

Hi Julian, don't know exactly how much room you have under the radar mount but I still think you will need a couple of pulleys! Motor mounted out of sight underneath the mast - shaft running up the mast to pulley #1 - pulley #2 mounted at end of the boom underneath the the radar mount.
Choose ratio of diameter pulley 1 to 2 according to the space available and final rotation rate (RPM) you want. Strong rubber band to connect the two pulleys.
Didn't need this method for my destroyer radar cos it sat right on top of the Director Tower, but used the pulley principle for gun turret rotation to connect two turrets together! 👍
One servo with extended rotation arc and two pulleys.
Cheers Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 22:49  
>> Permalink
mdlbt.com/30819

Doug:Doug:
Take a look at the radar picture I posted, it will give you a better look with what I working with.

Thanks
Julian😎

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
30th Jun 2017 22:54  
>> Permalink
mdlbt.com/30820

OK. So how deep is the boom at the outer end under the radar unit?
Doesn't look impossible, but fiddly!! 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
30th Jun 2017 23:01  
>> Permalink
mdlbt.com/30821

Doug:
The room is 3/4 to 5/16".
I think that even if I have little room, the motor head could protrude through the radar piece itself and not been seen.

Julian😎

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
1st Jul 2017 00:05  
>> Permalink
mdlbt.com/30822

Hmm! Up to you - but I believe that with a motor + gearbox length of ~ 1.25" plus room for cable connections dat woin't woik! 😭
So, it's now past 1am here in Munich so Gute Nacht, Good Night, Buenos Noches! 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
3rd Jul 2017 19:42  
>> Permalink
mdlbt.com/30882

Doug:
I guess you are correct.
I'll go that way>
Thanks
Julian😎

Dave M
(Fleet Admiral!)





Forum Posts: 1399
3rd Jul 2017 19:54  
>> Permalink
mdlbt.com/30886

Hi Julian
My 1:32 Trent lifeboat has a similar radar housing to your model. I made my radar casing around a very small servo with the feedback removed plus the the internal pins to allow for continuous rotation. You can remove the bottom part of the servo casing to make it even smaller. Mine sticks thro the top of the radar case and I plug the radar scanner onto the serrated drive.
It worked fine but I subsequently removed the electrics and drive the motor via a voltage reducer ( I make my own based on a 317 chip) but they are cheap to buy.
The real problem is the noise of the cheap gearing in the minature servos. OK on the water but very noisy if you are exhibiting inside.
See pics
Dave


Attached Files - Click To View Large


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
3rd Jul 2017 21:54  
>> Permalink
mdlbt.com/30897

Hi Julian, I think that's the easiest in the long run given the space available.👍 Also simplest (and quietest) way to get the drive round 90° corners 😉
If you don't have / can't find a suitable size rubber band get a length of round silicon rubber gasket material ca 1 to 2mm diameter. This you can cut to length (allowing for some tension) and join the ends with cyano adhesive. I used this method for the sealing gasket on my Type IIA sub. No leaks 😊 Have fun,😎 Doug
BTW: old stripped out video recorders / players are a good source of cogs, pulleys and drive belts 😉


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
4th Jul 2017 03:38  
>> Permalink
mdlbt.com/30905

Dave:
What are you doing up so late?.
Take a look at this continuos servo I found on Ebay.
Could it be good enough for my radar project?

http://www.ebay.com/itm/9g-Continuous-Rotation-Micro-Servo/1...

Julian😎

Dave M
(Fleet Admiral!)





Forum Posts: 1399
4th Jul 2017 11:12  
>> Permalink
mdlbt.com/30918

Hi Julian
Only 8pm when I posted so not that late.
May be small enough but is there a splined drive output underneath that top casing? You may need to add a short extension to the output. Could just be a bad pic as other sellers (Rapid) show similar with a spline above the top casing.
I attach a pic of a similar type to the one I used. This is one that burned out in my yacht. Metal gears so kept the case for spares. The motor melted!
23mm long 10mm wide 25mm deep from base to bottom of spline. 18mm if you remove the bottom casing.
Regarding suitability: are you intending to run the motor direct from a battery? The motor is very small and you will need to keep the voltage and current low (2v) to avoid overheating. The pulse internal driver will take care of this but without the electronics the motor needs protection.
Using the pulse system from the Rx will require three wires and a spare channel on the tx/rx.
Hope you can find a suitable servo
Cheers
dave


Live long and prosper

Dave
Dave M
(Fleet Admiral!)





Forum Posts: 1399
4th Jul 2017 11:46  
>> Permalink
mdlbt.com/30919

Hi Julian
Sorry forgot the pics
Dave


Attached Files - Click To View Large


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
4th Jul 2017 12:58  
>> Permalink
mdlbt.com/30921

To spline or not to spline? That is the question! 😉

Don't over-engineer. My destroyer radar works perfectly well totally independent of the RC! I just use the servo motor and gearing. Output shaft connected to the radar drive shaft with tight PTFE sleeving stripped from cable (13A mains or similar). Heat shrink sleeve also works well.
Power comes from a single 1.5V dry cell and switch hidden inside the bridge. A C or D size cell lasts for years & years & ...
Simply switch on before launching. Couldn't be simpler and no wasted RC channel 😊 In effect it's just a simple geared motor with no unnecessary frills. Cheers Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
robbob
(Fleet Admiral!)





Forum Posts: 55
4th Jul 2017 13:50  
>> Permalink
mdlbt.com/30930

This item is available from Keith at Modellingtimbers.

http://www.modellingtimbers.co.uk/21.html

Would something like this be suitable ?
You could possibly adjust the supply voltage and current to drop the revs.

Robbob.


Attached Files - Click To View Large


"Time flies like an arrow; fruit flies like a banana"
chugalone100
(Sub-Lieutenant)





Forum Posts: 18
4th Jul 2017 14:53  
>> Permalink
mdlbt.com/30931

Robot:
Thank you for the modellingtimbers link, they have lots of stuff that I was looking for.

Julian😎👍

chugalone100
(Sub-Lieutenant)





Forum Posts: 18
4th Jul 2017 15:06  
>> Permalink
mdlbt.com/30932

Doug:
Yes, I was contemplating the idea of running the radar via small dc with a separate switch, that way I wouldn’t need to use a channel.
I have been inspecting lots of different wiring diagrams to set up my electronics from Action Electronics.
Looking at them I’m beginning to understand how to embrace the project and of course, you guys will give me the last word.
By the way, I love your models, they look impeccable inside and out.

Julian😎

chugalone100
(Sub-Lieutenant)





Forum Posts: 18
4th Jul 2017 15:08  
>> Permalink
mdlbt.com/30933

Dave:
I just sent a post to Doug about how to set up my radar, but it was you that gave the idea.
Thank you.
Julian😎

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
4th Jul 2017 19:42  
>> Permalink
mdlbt.com/30948

A joint effort! 😉 as often 👍
Main thing is you have a solution that works for you Julian 😊
Saludos Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug