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Radar Drives

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Michael Jeenes29/04/2012 19:36:34
36 forum posts

Hi All. I am building the 'Portgarth' Tug from MMM and would like to have the radar working. Problem is that any drive from within the deckhouse would have to pass through the largely glass wheelhouse and look rediculous.It would also have to undergo several changes of direction requireing some sort of flexible drive. Is it possible to buy small, slow running motors that could fit direct to the radar without looking out of place?

mike farrell29/04/2012 20:44:07
378 forum posts
6 photos

Hi Michael, Like you I am building a MMM model but the smaller Anglian man and intend to drill through the roof, floor and mounting a small 30 rev. per minute motor to the floor with connections to e an ancillary power supply,Main problem is to remember to disconnect before removing superstructer from the deck.There is a few on sale on that other bay . T he drive will be connected via a Sullivan plane ailerons connecter which I,v had t over from past projects .Otherwise ring Dave at MMM,he might give you better advise. Good luck Michaelwink

Dave Milbourn30/04/2012 08:45:55
avatar
4025 forum posts
282 photos

https://catalog.precisionmicrodrives.com/order-parts#dc-gearmotor
A fascinating website for very small motors, but just look at the price of their Mabuchi motors......£12 for a bog-standard 540! Ouch!
Dave M

Michael Jeenes30/04/2012 10:40:07
36 forum posts

Thanks Mike & Dave.

The idea of placing a geared motor (I have two from Maplins) under the deckhouse floor and using a 'flexidrive' passing through the wheelhouse was considered but as stated above it would look out of place. I have been on board the 'Portgarth' twice and will try to fill the wheelhouse with detail gleaned from the photos taken. Any drive from below would have to come through the center control desks and look out of place. Fitting a small motor directly to the mast and radar is more in keeping with full size practice if I can manage it. I will have a look at the website Dave and see if any product will do the trick. I do not understand electronics, it is all jibberish to me so any purchase will be a risk.

MJ

ashley needham30/04/2012 17:07:08
avatar
7218 forum posts
169 photos

MJ. If you have no luck, I recon that thick nylon fishing line might just do the trick as a flexidrive, and will be clear(ish) to boot. Would be stiff enough for the very low torque needed, and even the "thick" stuff would be very thin (if that makes sense).

Ashley

Michael Jeenes30/04/2012 20:23:24
36 forum posts

Hi All.

Thanks for your inputs. I will take your idea on board Ashley..maybe make up a test bed first if the following does not work out.Thin 'strimmer' plastic cable may also do it.

I have been in touch with "precision micro drives" Dave. they have been most helpful. Despite the possible costs involved for such a small function I may give it a try. They have a motor 6mm dia x 16mm which could do the job on lower voltage to reduce speed. Thanks for the introduction.

sammyk30/04/2012 20:41:35
avatar
104 forum posts
33 photos

hi michael ,i used an old servo with the electronics removed and ran it on 1.5 volts (aa battery) and costs next to nothing .regards sammyk

Michael Jeenes30/04/2012 21:08:15
36 forum posts

Never gave that a thought Sammy. I have two or three mini/micro servos with striped gears. will have to locath them and see what gives.

thanks MJ

sammyk30/04/2012 21:13:47
avatar
104 forum posts
33 photos

michael you need to keep the gears in or it spins to fast, then again its worth a try

Michael Jeenes01/05/2012 11:51:54
36 forum posts

Found that out Sammy. No room for gears as well.

Have found right size motors but they all too fast.

Next thought...Can a PC board be used to reduce the power delivered? Now this question comes from a man who knows more than nothing about 'electronics', all jibberish to me so any reply should treat me as an idiot. If it is possible the I will search for a local person who can make it for me. Just how complicated can a simple task like powering a radar be??????!!!!

MJ

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