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Old Aug 13, 2015, 03:51 AM
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Help!
Help! Rope pulling system, Servo/stepper?

I'm working on a project and need help with the setup.

I need to radio controll a servo (or stepper motor?), for pulling a rope, about 50cm ... so some kind of winding it up on a spool.

When i give any input on my radio it will have to go proportionally with the gain i gives.. when i put the stick back in neutral position the motor has to go back/unwind the rope to it original position.

need's to be some size on this, motor need to be able to pull minimum 10kg
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Old Aug 13, 2015, 06:40 AM
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A model boat sail winch servo ?

https://www.google.co.uk/search?q=mo...FUdWGgodM-8NWA
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Old Aug 13, 2015, 07:56 AM
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Yeah, well .. something like that could work, but as i said i need it to be quite big.. need to pull +50cm with 3mm rope, so i need a big drum .. is a servo or a programmed stepper the best option..

if servos, where can i get so big servos witch complies with the requirements I have
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Old Aug 13, 2015, 08:39 AM
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For bigger than normal RC servos, a sail boat supplier should have powered sail winches --

https://www.google.co.uk/search?q=bo...+winch&imgrc=_

RC servos are generally rated in Kg/cm for torque, you may find a large RC one.
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Old Aug 13, 2015, 09:08 AM
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Yeah, i think i found some.. Link

But when it comes to the controlling of this?... as i said in the first post: When i give any input on my radio it will have to go proportionally with the gain i give.. when i put the stick back in neutral position the motor has to go back/unwind the rope to it original position.
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Old Aug 13, 2015, 09:27 AM
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Sorry, I have no idea if sail winches come with full proportional, (follow the stick), control, like a standard servo.

If a sail winch servo is the right sort of device, perhaps a question in the Sailboat forum is best --

http://www.rcgroups.com/sailboats-59/
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Old Aug 13, 2015, 09:52 AM
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Quote:
Originally Posted by eflightray View Post
Sorry, I have no idea if sail winches come with full proportional, (follow the stick), control, like a standard servo.
Yes, it does. The only difference to a standard servo is bigger size and lower gear ratio to allow multiple turns of the drum.
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Old Aug 13, 2015, 09:54 AM
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Most new cars use a winch and cable system to operate the power windows. These things are crap and get replaced quite often. They are pretty cheap on Ebay (search for 'power window motor'), any repair shop will have some broken ones in the scrap pile. You will have to design a system with limit switches and relays to control the motor.
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Old Aug 13, 2015, 10:06 AM
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...You will have to design a system with limit switches and relays to control the motor.
But he wants a proportional winch.

If I went this route, I'd put a feedback pot (with pulley and reduction gear) somewhere along the cable, then use standard servo electronics for control. A H-bridge would be needed between servo controller and motor to provide enough current.
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Old Aug 16, 2015, 12:42 AM
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Quote:
Originally Posted by VSO View Post
I'm working on a project and need help with the setup.

I need to radio controll a servo (or stepper motor?), for pulling a rope, about 50cm ... so some kind of winding it up on a spool.

When i give any input on my radio it will have to go proportionally with the gain i gives.. when i put the stick back in neutral position the motor has to go back/unwind the rope to it original position.

need's to be some size on this, motor need to be able to pull minimum 10kg
These things are really expensive. But perhaps you can find one that will do what you need.

https://www.servocity.com/html/spg80..._rotation.html
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