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Servo rotation

Non standard use

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Peter Russell 306/12/2018 15:58:19
8 forum posts


I have a DX6 and want to get the servos to go 180 deg not 90

Any sugestions as to how to do it?

Nigel R06/12/2018 16:08:03
2968 forum posts
471 photos

The obvious answer is to buy a 180deg servo.

Peter Christy06/12/2018 16:19:21
1517 forum posts

How is your soldering? You are unlikely to be able to increase the throw at the Tx end sufficiently to get 180 degrees from a standard servo.

It is theoretically possible to modify the servo amps to achieve 180 degree travel, but it is not a job for the faint hearted or inexperienced! There are many pitfalls.awaiting the unwary. It might be easier just to try and get some 180 degree servos - if anyone sells them any more....!



Chris Bott - Moderator06/12/2018 16:26:36
6650 forum posts
1381 photos
1 articles
Remember that many 180deg servos are not proportional. They don't move until your stick passes centre position, at which point they go straight to the other extreme.
Don Fry06/12/2018 16:56:52
3814 forum posts
42 photos

I think the units Nigel R pointed out are proportional, used as pan motors for a camera.

Gary Manuel06/12/2018 17:34:26
1873 forum posts
1507 photos

If you use a programmable servo and a compatible programmer, you can extend the "out of the box" end-points.

As an example, the Hitec HS-5245MG can be extended from the default 118 degrees to 199.5 degrees.

Servo spec databases you can find online don't always show the full details. I have found that Servo City show more data than most. Here is their data for the HS-5245MG as an example.

Here is a suitable programmer.

Peter Jenkins06/12/2018 23:35:27
1233 forum posts
132 photos
Posted by Peter Russell 3 on 06/12/2018 15:58:19:


I have a DX6 and want to get the servos to go 180 deg not 90

Any sugestions as to how to do it?

Peter, what are you trying to achieve? You will get more focused answers if you tell us that.

Peter Russell 307/12/2018 13:35:23
8 forum posts


I am using a servo to open a steam valve in a model locomotive.

Ive used a toothed belt and two pulleys of equal teeth with one pulley on the steam valve the other I have mounted on the servo.

If I can get a half turn of the servo giving me a half turn on the steam valve using the throttle channel on my Tx with the stick going from full down to full up I will have achieved my object only mini servos will fit ie 12 x 23 x 21 mm.

Hope this helps

Pete Russell 3

Kim Taylor07/12/2018 14:13:12
274 forum posts
53 photos
Posted by Peter Russell 3 on 07/12/2018 13:35:23:


I am using a servo to open a steam valve in a model locomotive.

Ive used a toothed belt and two pulleys of equal teeth with one pulley on the steam valve the other I have mounted on the servo.


Pete Russell 3


Is it possible to get different sized pulleys, i.e if the pulley on the servo is twice the dia of the one on the valve, you'll get the same effect as twice the angular throw.


Edited By Kim Taylor on 07/12/2018 14:14:00

The Wright Stuff07/12/2018 14:17:06
1383 forum posts
226 photos

Any idea how stiff the valve is?

If you double the throw, you'll half the torque of the servo. I think this might be a big ask for a mini servo.

Mike Blandford07/12/2018 17:35:48
521 forum posts
22 photos

I have some code for a small Microchip PIC processor that extends a servo pulse to give a 180 degree rotation for using a normal servo to drive mechanical retracts. It does also slow down the output change to give a realistic retract operation.


Don Fry07/12/2018 18:38:35
3814 forum posts
42 photos

Peter, to clarify, you need something to open or close a valve? You are not interested with the intermediate positions? Or are you interested in the intermediate positions?

Martin McIntosh07/12/2018 19:50:53
2901 forum posts
1062 photos

Please see my post on `Don`t just stand there, get one up!`

If the servo has wiring to the potentiometer , `pot`, and to the motor as opposed to ones which are directly soldered to the PCB then you can add resistors to each end of the pot. Try values from 1K0 to 2K7 (1000 to 2700 Ohms) which will extend the travel. For flaps I have used TGY 180D`s to great effect.

Don Fry08/12/2018 11:38:28
3814 forum posts
42 photos

Couple of thoughts. The proportional servos with 180° rotation are used by the flying cameras people, and the robot builders. They have their own websites.

One which has the dimensions you need is on the HobbyKing site, is a analogue servo, cheap. SKU is 9399000001. If you want to up its power a bit, run it on a 2s LiFe battery, 6.6 volts. But you may need a charger for this battery. I did see they were selling a B6 charger for a small price on special offer the other day. But that's about the end of the knowledge tree for me.

Handyman14/04/2019 19:49:53
198 forum posts
1 photos

HI all,sorry if this is the wrong place for this post, but I have couple of the black DX6s that I use for buddy box training,I fetched the master tranny out tonight to charge up battery and to check all controls. I appear to have a problem with my Aileron potentiometer, which I confirmed by using the monitor function.

Where do I get my Spektrum gear repaired these days, Can anyone point me in the right direction,please.


Edited By Handyman on 14/04/2019 19:50:40

Chris Walby14/04/2019 21:07:34
952 forum posts
228 photos

Al's Hobbies, **LINK**

Used them a couple of weeks ago, fast and cost effective service.

Doc Marten14/04/2019 21:29:40
364 forum posts
4 photos

Don't the boat guys use 180 servos for winches?

Handyman16/04/2019 00:34:11
198 forum posts
1 photos

Thanks for the info Chris Walby,been in touch and will be sending transmitter to Garry at Al's Hobbies. Thanks again.


Geoff Sleath16/04/2019 01:04:37
3296 forum posts
251 photos
Posted by Doc Marten on 14/04/2019 21:29:40:

Don't the boat guys use 180 servos for winches?

Sail winches rotate more like 720 degrees. I can't remember exactly and I can't easily check the one in my incomplete Thames barge hull but that's some where near.


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