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Author Topic: Winch or regular servo  (Read 373 times)
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I am trying to build a robotic arm and for the base I need a servo with a lot of torque. After browsing through hobbyking's servo selections I noticed that winch servos offer a higher torque for generally a lower price, however, I do not have any experience using them.

Before I commit to spending a lot of money on potentially incorrect servos for my project does someone know whether there would be a problem using winch servo for the base that would only need to rotate around 90 degrees?

I have read that winch servos are not as precise, but as long as the servo is within 1-3 degrees of what it should be that is fine with me.

Also can you still tell the servo to turn to 0 degrees or 35 or 87 degrees like a normal servo or is it like a continuous rotation servo where it keeps turning until it hits the end of its rotation and writing 100 vs 180 simply controls the speed?

Thanks for your help.
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Yes and no.

The normal servo motor has an 'arm'. Most can do 180 degrees, some 360, some continuous rotate.
If you replace the 'arm' with a disc for a rope, you have a winch servo.

The winch servo is sometimes used with the 360 degrees, or with a continuous rotating servo.
The main use seems to be for RC sail boats.

If you want an accurate 90 degrees servo with a lot of torque, please forget those winch servos and use a good quality normal servo.

Someone asked a about good servo motor a week or two ago. I wrote then that these brushless double bearing servos look very promising: http://www.futaba-rc.com/servos/brushless.html
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When you say "a lot of torque" what does that mean??  Without calculating the torque you cannot choose
a servo.
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Quote
Before I commit to spending a lot of money on potentially incorrect servos for my project does someone know whether there would be a problem using winch servo for the base that would only need to rotate around 90 degrees?

If only 90 deg rotation is needed, then use a regular servo. If the arm is large then use bearings (lazy susan setup) in the base so it takes the load and a really large servo isn't needed.
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Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   smiley-cool

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