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10-25-2006 03:47 AM  12 years agoPost 1
Jaymac26

rrApprentice

Okotoks, Alberta - Canada

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Hello
I was wondering how hard it is to rewire a servo. I have a servo that came off my Raptor and I want to use it on my JR Gasser for the camera mount. Do I just change the wiring or is there a process to doing this.

Jason McKay

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10-25-2006 04:39 AM  12 years agoPost 2
perfesser zero

rrKey Veteran

Dublin, VA., USA

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360 servo rotation
Here is an article on 360 servo mods.

http://www.uoguelph.ca/~antoon/gadg...s/servomod.html

Hope this helps.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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10-26-2006 03:34 AM  12 years agoPost 3
AirWolfRC

rrProfessor

42½ N, 83½ W

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I don't see how that mod is capable of working. There is no position feed-back at all by using two fixed resistors. You can make the servo rotate 360º but you can't get it to hold a commanded position.

Wolfgang

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10-26-2006 10:35 AM  12 years agoPost 4
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Jason, are you simply looking to extend the servo wire, or something more sophisticated?

I agree with Wolfgang, I can't see how that 360 servo mod would work either, no feedback!

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-26-2006 01:02 PM  12 years agoPost 5
perfesser zero

rrKey Veteran

Dublin, VA., USA

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360 servo...
I'm not familiar with the mod myself, even though back years ago I put together allot of the Ace Bantam servos. This article was just the first one I found. I figured if it didn't answer his question that it would at least give him some insight on what was required. Yes, I see that the mod is a little questionable now that you've made light of the feedback section. I work in the school system here and have noticed that the tech ed depts have robotic arms that use HiTec servos for motion control. They are using 805's and 625's on geared platforms. They would have to be 360 degree enabled. So I know that a regular servo can be modified to do this. BTW, doesn't Hitec sell 360 degree modified servos? If so, this might be the way to go.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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10-26-2006 03:21 PM  12 years agoPost 6
AirWolfRC

rrProfessor

42½ N, 83½ W

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I have not found any servo that can do 360º out of the box. Usually, there is some kind of multi-turn pot on the outside of the modified servo.

Wolfgang

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10-26-2006 06:45 PM  12 years agoPost 7
CXD

rrApprentice

Norway

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hitec does have a servo that is 360 modified out of the box.
its a winch servo for sailboats:
HITEC MODEL: HS-785HB
HITEC PART #: 33785#
DESCRIPTION: WINCH SERVO
TORQUE 4.8/6.0Voz.in: 152.75oz/183.31oz
SPEEDsec/60°at 4.8/6.0V: 1.68/1.38
BEARING: DUAL BB
SIZE LxWxH in: 2.32"x1.14"x1.96"
WEIGHT oz: 3.88oz.

Dumb Thumbing doesn't apply to pinchers!

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10-26-2006 07:10 PM  12 years agoPost 8
AirWolfRC

rrProfessor

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It may be a bit on the slower side for paning but it looks like it will do.

Wolfgang

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10-26-2006 10:50 PM  12 years agoPost 9
Jaymac26

rrApprentice

Okotoks, Alberta - Canada

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Thanks for the info. I am looking at using the servo as a camera shutter trigger. The servo is made from Airtronics and My Gasser is a JR set up. I see no point going and buying a new servo if I can convert the wiring to work with my JR receiver.

Jason McKay

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10-26-2006 11:14 PM  12 years agoPost 10
AirWolfRC

rrProfessor

42½ N, 83½ W

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If all you're doing is shutter, I don't see why you need to rewire anything at all.

Wolfgang

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10-26-2006 11:23 PM  12 years agoPost 11
Jaymac26

rrApprentice

Okotoks, Alberta - Canada

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My wiring harness is different. The wires colorsdo not match. I don't know if the polarity is the same. I don't want to mess anything up.

Jason McKay

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10-26-2006 11:43 PM  12 years agoPost 12
AirWolfRC

rrProfessor

42½ N, 83½ W

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Well, can't help you if you don't give some detail on what servo you have and what connector is on it. I'm not clairvoyant. Either way, other than possibly changing the connector, should work fine.

Wolfgang

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10-27-2006 09:30 AM  12 years agoPost 13
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Might be one of those "need to swtich signal and earth connector" type sitautions, but without more info, I cant say. What colour leads are on the servo, what coloured leads are you used to, what's the difference?

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-27-2006 11:15 AM  12 years agoPost 14
Yug

rrMaster

UK. Herts

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I modified a servo for a camera pan. Its pretty simple to do......
Remove the POT and measure its resistance. Solder in 2 resistors that are half this resistance and the junction of the 2 resistors needs to connect to the same point at the POT wiper. Remove the endstop lug of the output gear to allow it to rotate 360 degrees. For this you may need to remove a bit of plastic as well.
You now have a 360 degree servo. The only problem is that because it has no feedback pot, it can easily drift if it has a narrow deadzone and you are using PPM. PCM is much more precise because you don't get as much jitter on the PWM control signal to the servo. You'll also need to trim the tx to find the centre stop position on the servo. Set ATVs to something like 30% and the stick input now controls the speed at which the servo moves in one direction or the other.
I also used this system for one of my kids - the servo became the drive motor for a lego car

Vegetable rights and Peace

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10-27-2006 03:39 PM  12 years agoPost 15
AirWolfRC

rrProfessor

42½ N, 83½ W

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YUG,
That sounds like the same thing as referenced in the second post in this thread. As you mentioned, there is no longer any feed back. BUT you can rotate as many times as you like for as long as you hold the stick. Could be used as a forward / reverse drive for something.

With center stick on the TX trimed in , you can get the servo to hold still and pan either way when you move the stick and stop when the stick is returned to center. But you don't know where the servo is without looking at the servo.

BTW, in his second post he said
I am looking at using the servo as a camera shutter trigger.
Wolfgang

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10-27-2006 03:59 PM  12 years agoPost 16
Yug

rrMaster

UK. Herts

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oops, missed the trigger bit. For feedback, you may be able to replace the pot with a multiturn pot, or even add a pinion gear to the horn, which drives a larger gear on an externally mounted pot. If the gear ratio was say 2:1, then you would have your 360 degree servo with feedback.

Vegetable rights and Peace

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10-27-2006 11:42 PM  12 years agoPost 17
Jaymac26

rrApprentice

Okotoks, Alberta - Canada

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THe servo is a 1322 sanwa with blue, red, and black wires. The receiver is a JR with red, orange, and brown. All I want the servo to do is push the camera button. I have been looking at an IR trigger but I need a new camera with this feature. THanks let me know if you need more information about the servo.

Jason McKay

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10-28-2006 03:21 AM  12 years agoPost 18
AirWolfRC

rrProfessor

42½ N, 83½ W

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Does the connector look like it will easily fit into the JR receiver ?

If so, it has the blue Z connector, then plug it in the desired channel with the red wire in the same position as the rest of the servos and be done with it.

If not then put the proper connector on the end of the servo cable, keeping the wires in the same orientation and then proceede as above.

Wolfgang

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10-28-2006 04:59 PM  12 years agoPost 19
Jaymac26

rrApprentice

Okotoks, Alberta - Canada

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I will try that. Thanks for your time.

Jason McKay

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