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Author Topic: Advise on Bowden cable  (Read 5795 times)

spreet

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Advise on Bowden cable
« on: September 01, 2012, 11:47:54 am »
Hi there all, I am building a thames barge, 1/32 scale, am wanting to use bowden cable for the rudder linkage to my servo. This will need to be run on both sides of the stern post.
 I have a question to ask, if using the 3mm cable available from Cornwall model boats, what is the curvature restrictions? I plan to run approx. 19cm of cable each side, the majority of which will be under the deck from inside the main hold and will bend it over the last 2cm up through the deck, then to the rudder post another 2cm. Effectivly creating a elongated "S", am I expecting too much or am I thinking along the wrong lines?

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Stavros

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Re: Advise on Bowden cable
« Reply #1 on: September 01, 2012, 11:55:54 am »
Personally I cant see a problem with what you are doing especially if there is not a kink in the cable.

Welcome to the forum a location on your profile might help you find a fello member close by to where yo live who could possibly help you

Dave
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Circlip

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Re: Advise on Bowden cable
« Reply #2 on: September 01, 2012, 01:04:29 pm »
The more bends you have, the greater the friction. Is it not possible to follow the full size routing? 3mm may be a bit chunky, have you looked at Fishing tracer?

  Regards   Ian
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ACTion

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Re: Advise on Bowden cable
« Reply #3 on: September 01, 2012, 01:28:52 pm »
If you intend to connect both sides of the tiller to the servo then you don't need Bowden cable at all. Like Circlip says, you can use fishing trace ('cos one side is always pulling).
DM
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ukmike

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Re: Advise on Bowden cable
« Reply #4 on: September 01, 2012, 01:41:49 pm »
Fishing trace is the way to go.

Pike trace should be enough abt 70/100 lbs B.S.

If you need physically larger dia. for scale effect, then you can go with the heavier Shark trace.

Both are far more flexible than Bowden cable.

Make sure that you get the symmetry correct for the control arms to keep the tension even on both cables.

3mm Bowden cable is far to heavy.

Mike.
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Circlip

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Re: Advise on Bowden cable
« Reply #5 on: September 01, 2012, 01:54:06 pm »
And connect both ends of the cable together and use a single arm connection to the servo.

  Regards   Ian.
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Netleyned

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Re: Advise on Bowden cable
« Reply #6 on: September 01, 2012, 05:13:24 pm »
Quote from: Circlip on September 01, 2012, 01:54:06 pm
And connect both ends of the cable together and use a single arm connection to the ervo.

  Regards   Ian.

How would
that work?
Any chance of a digram?

Ned
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spreet

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Re: Advise on Bowden cable
« Reply #7 on: September 01, 2012, 05:38:45 pm »
Thank you all to those who have already responded.I am going to try and post a photo on the hull as at present have never done this before but we all go through learning curves don't we.

Ian
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Circlip

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Re: Advise on Bowden cable
« Reply #8 on: September 01, 2012, 05:50:09 pm »
Think a fully closed loop without the servo Ned. Providing the loop is kept in tension, you can make a single point connection to one leg of the servo anywhere on the loop.

  Regards  Ian.
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spreet

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Re: Advise on Bowden cable
« Reply #9 on: September 01, 2012, 05:56:20 pm »
Hi there again, have just tried to print a photograph to enable me to draw on it and show my intentions.

The ink has run out....Blah!!
Didn't knowhow to upload pic.
If the image can be seen, then note the shaded area on the deck skin which is where i want to bring the cable up through.
Won't go any further as I might not bewasting everyone's time

Ian
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nemesis

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Re: Advise on Bowden cable
« Reply #10 on: September 01, 2012, 06:09:59 pm »
Hi, Go and look at aircraft snake link, I used this system on my U- Boat for the rudders & planes.
   Nemesis
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Netleyned

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Re: Advise on Bowden cable
« Reply #11 on: September 01, 2012, 06:29:46 pm »
Quote from: Circlip on September 01, 2012, 05:50:09 pm
Think a fully closed loop without the servo Ned. Providing the loop is kept in tension, you can make a single point connection to one leg of the servo anywhere on the loop.

  Regards  Ian.

Aha! I was thinking of a push pull type system with two wire traces linked to either side of rudder bar and servo.

Regards

Ned
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spreet

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Re: Advise on Bowden cable
« Reply #12 on: September 01, 2012, 06:34:10 pm »
Hi, as my previous attempt at putting a pic worked, thought I'd add one more . This one shows the rather crude work under the skin, the cable would run either side of the balsa strip in the centre

Have been trying to find a photo already on here that shows theliks connected to the rudder, Ican't butit relatd to a Will Everard model.
Ian
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spreet

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Re: Advise on Bowden cable
« Reply #13 on: September 01, 2012, 06:59:03 pm »
It's me again, have found the posts under Engineering Techniques and materials / rudder control. Photos from Mike K. Don't know how to put the post link in, sorry.
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Tug-Kenny RIP

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Re: Advise on Bowden cable
« Reply #14 on: September 01, 2012, 08:36:25 pm »

When you find the post, you will notice the address in the top line of your screen.

Right click on it and copy, then paste this link in your next letter on here.   :}

Hope this helps.

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spreet

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Re: Advise on Bowden cable
« Reply #15 on: September 02, 2012, 06:03:01 pm »
Hi, thank you Kenny,
This is the post i was refering to;
http://www.modelboatmayhem.co.uk/forum/index.php?topic=2780.msg27828#msg27828
These show the control different to how I'm doing mine but does show the rudder post.
Will look at snake lines now

Cheers all, Ian
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Circlip

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Re: Advise on Bowden cable
« Reply #16 on: September 02, 2012, 08:28:17 pm »
Snake outers should be fully supported and any bends in the routing will introduce slop, this is why in toy Aeros closed loop is the preffered system.

  Regards  Ian.
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ukmike

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Re: Advise on Bowden cable
« Reply #17 on: September 02, 2012, 08:39:15 pm »
Quote from: Circlip on September 02, 2012, 08:28:17 pm
Snake outers should be fully supported and any bends in the routing will introduce slop, this is why in toy Aeros closed loop is the preffered system.

  Regards  Ian.

TOY Aeros as opposed to TOY Boats ?

Models, is a more fitting description I think.

Mike.
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Circlip

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Re: Advise on Bowden cable
« Reply #18 on: September 02, 2012, 08:43:39 pm »
If thine eye offends thee - - - -


   Regards  Ian.
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ukmike

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Re: Advise on Bowden cable
« Reply #19 on: September 02, 2012, 08:50:17 pm »
Quote from: Circlip on September 02, 2012, 08:43:39 pm
If thine eye offends thee - - - -


   Regards  Ian.
I dare not pluck out the one remaining eye that I have, else how would I be able to continue making these toy boats ?

Mike.
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RAAArtyGunner

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Re: Advise on Bowden cable
« Reply #20 on: September 03, 2012, 01:41:50 am »
Do I detect some toying going on  O0 O0 %) %) %)
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