Uprate a model servo

[Derek66]

I am in the process of building a large model sailing cutter and have built a sail winch driven by a 6v dc motor which is more powerfull than comercially availiable ones.
I need to either uprate somehow or buid a new cct to control this. I intend to use a 10 turn feedback pot as it will rotate 8 turns end to end.
I have a few old Futaba servos that I have stripped down for their boards and idealy would like to uprate the o/p current somehow.
Any Ideas?
Thaks in advance
Derek

 

[Bluejets]

Servos, even from the same manufacturer, vary quite a bit depending on the age.
It would be possible for some to take the clockwise/counterclockwise signal from the servo controller chip and feed into a larger H-bridge to drive your 6v motor.
Also input your 8 turn feedback device to the same controller.
Older servo control boards would be more accessible to changes I would imagine so it depends what servos you have stripped down.
I found the circuit for an S3003 quite readily but I have no idea as to the ability to access the particular controller without first seeing the board.
In some ways it might be easier just to get a sail winch servo, depends on your ability with electronics etc. I would imagine.
I've shown the one I found below as an example.

 

[Colin Mitchell]

Take this linear actuator and connect the output to the winch and then take the output of the electronics to a bridge to drive your motor. It's that simple.

 

[Derek66]

Servos, even from the same manufacturer, vary quite a bit depending on the age.
It would be possible for some to take the clockwise/counterclockwise signal from the servo controller chip and feed into a larger H-bridge to drive your 6v motor.
Also input your 8 turn feedback device to the same controller.
Older servo control boards would be more accessible to changes I would imagine so it depends what servos you have stripped down.
I found the circuit for an S3003 quite readily but I have no idea as to the ability to access the particular controller without first seeing the board.
In some ways it might be easier just to get a sail winch servo, depends on your ability with electronics etc. I would imagine.
I've shown the one I found below as an example.

Thanks for your help.
I bought the servos 40 years ago. However I am not familiar with H bridges.
My electronics knowlege is limited to building a few op amp projects many years ago..
Would you be able to point me at a suitable component? I would guess it would need to be rated at 3 amp ish.
A comercial servo is no good to me as the one i have buit has a self tailing clutch mechanism on it
Thanks Derek

 

[Derek66]

Take this linear actuator and connect the output to the winch and then take the output of the electronics to a bridge to drive your motor. It's that simple.
View attachment 24740

Thanks for your idea. I had not thought of doing it that way. Would you be able to give me an idea of a cct. My electronis knowledge is very limited.
Thanks for your help.
Derek

 

[Bluejets]

H bridge intro.....
http://www.pyroelectro.com/tutorials/h_bridge_4_transistor/