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Karl
Joined: 06 Mar 2008 Posts: 18 Location: Derby
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Posted: Sat Oct 17, 2009 6:56 pm Post subject: Using 4 servos? |
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Hi all,
Just a quick question for those in the know. I'm currently running two std size futaba BLS152 servos, one for the throttle and rear brake, the other for the front brakes. The front brake servo is using the 3rd channel brake mix function for setup on my futaba 3VCS transmitter. The steering uses one rhino servo, but I would like to use two............
Hence my question........
To use two rhinos I need one to work in the reverse mode of the other (push and pull) and hence I can't use a Y lead to let two servos run off channel 1. If I use my 3rd channel to control the 2nd steering servo, then I can't setup my front rear brake balance, which is currently set via the brake mixing function on the transmitter.
Does anyone have any advice as I have seen cars running 4 servos, how do you set them all up?
Many thanks in advance.  _________________ Best regards,
Karl
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ozzy10

Joined: 12 Dec 2007 Posts: 657
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Posted: Sat Oct 17, 2009 7:18 pm Post subject: |
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i run 4 servos on my hormann and i use a Y lead for the 2x steering servos _________________ The two most common elements in the world are hydrogen and stupidity.
Hormann ht2 race evo
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Karl
Joined: 06 Mar 2008 Posts: 18 Location: Derby
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Rover Man SITE ADMIN

Joined: 01 Nov 2007 Posts: 1341 Location: Tipton
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Karl
Joined: 06 Mar 2008 Posts: 18 Location: Derby
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eXraycer

Joined: 25 Aug 2009 Posts: 30 Location: Sydney, AU
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Posted: Mon Oct 19, 2009 6:52 am Post subject: |
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| Karl wrote: | Thanks for the reply, I thought that might be the case, which is feasible when the two steering servos are sat next to each other with their servo horns at opposite sides, but to make the packaging easier in my baja I really need the servos with their horns in the same position, hence I need one servo to do the reverse of the other in order to push and pull.
Is is possible to somehow reverse what a servo does by internal mods in the servo so that I could use a Y lead?
Edited to add, could I swap over the internal potentiometer wiring to achieve a reversed servo action compared to the std rhino config? |
There's a gadget you can buy that will do everything you want plus more. JR matchbox. You can reverse and centre (subtrim) each servo individually and adjust their endpoints. also you can run separate power though it. Also handy if you get a situation where one servo fights the other so they will last longer if they're not getting loaded up by the other servo.
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GT'S RACE PARTS
Joined: 28 Apr 2009 Posts: 11
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Posted: Sun Oct 25, 2009 9:46 pm Post subject: servo reverse |
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printman

Joined: 07 Nov 2007 Posts: 151 Location: Andover
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stevo

Joined: 05 Mar 2008 Posts: 1003 Location: Not far enough
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Avgas

Joined: 02 Nov 2007 Posts: 772 Location: Doing my bit for LSOR
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Posted: Sun Oct 25, 2009 11:09 pm Post subject: |
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Hi Karl,
from our chat the other day, one of the lads said there is one on the hpi-Europe forum. They have done what we was talking about.  (not had a chance to look at it yet)
Steve _________________
The truth is out there, its just whether you want to listen! |
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bajamike

Joined: 17 Jun 2008 Posts: 73 Location: Launceston
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Posted: Tue Oct 27, 2009 8:50 am Post subject: |
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On older servos, reversing the red and black, had to be done with reversing the pot as well. not sure if that still follows for these.
however i think Stevo's advice is very sound, leave it well alone.
better still contact
Mike Ridley, Model Radio Workshop
07708436163
he is the main Multiplex repair/service, and is very knowledgeable. _________________ Never argue with idiots! they only drag you down to their level, and then win on experience!
HF Racing, Contrast Offroad RC. |
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