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  • Hi,

    I’m planning to make a robotic Arm, so would like CE's input.

    What is better to use to control joints of the robotic arm, Stepper or Servo?

    I’m looking for good and sturdy movements as well as good capacity for lifting, let’s say 20kg.

    Thanking you in advance.

    ~ Ice
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  • silverscorpion

    Member • Dec 26, 2008

    Servo is obviously better to use in robotic arms because servos have internal control mechanism. So servos can give better control and precision than steppers.
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  • icehari

    Member • Jan 5, 2009

    silverscorpion
    Servo is obviously better to use in robotic arms because servos have internal control mechanism. So servos can give better control and precision than steppers.
    but i learnt stepper motors are very useful to make movements in steps and angular mavements..... what about that...

    reply me lets make that clear...
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  • sauravgoswami

    Member • Jan 5, 2009

    Stepper motors are always better they are easier control and manipulate compare to servo motors
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  • Ashraf HZ

    Member • Jan 5, 2009

    20kg? Servos would work better with those types of loads. But, they are more expensive.

    If I were you I'd get one a piece and do some testing 😀
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  • icehari

    Member • Jan 6, 2009

    ash
    20kg? Servos would work better with those types of loads. But, they are more expensive.

    If I were you I'd get one a piece and do some testing 😀
    yes i agree, servo's can pull heavy loads better than stepper..
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  • ice111

    Member • Jan 6, 2009

    Hi,

    In robotic arm, pulling heavy load will not be the only issue, it should be also precise and accurate movements also on X, Y and Z axis.

    The <a href="https://www.makemyhobby.com" target="_blank" rel="nofollow noopener noreferrer">Aquarium FISH & PLANTS online, shipping all India.</a> people assured me that they can able to provide 17-20kg servo torque for under $75 on special order. But just for trial and error that amount is also out of reach.

    So looking for precise solution either go for Servo or Stepper or make a U turn and use pneumatic, but again that will be difficult to get in India for cheap.

    ~ Time
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  • Ashraf HZ

    Member • Jan 6, 2009

    ice111
    Hi,

    In robotic arm, pulling heavy load will not be the only issue, it should be also precise and accurate movements also on X, Y and Z axis.

    The <a href="https://www.makemyhobby.com" target="_blank" rel="nofollow noopener noreferrer">Aquarium FISH & PLANTS online, shipping all India.</a> people assured me that they can able to provide 17-20kg servo torque for under $75 on special order. But just for trial and error that amount is also out of reach.

    So looking for precise solution either go for Servo or Stepper or make a U turn and use pneumatic, but again that will be difficult to get in India for cheap.

    ~ Time
    Yep, both are accurate. However, you'll have better control with servos in some cases as they have feedback control. For steppers, you will have to assume the motor will perform with the given command. In most cases they do, but if an external factor effects the torque or angle of the stepper like a bump, then you would not get the position you require.
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  • sauravgoswami

    Member • Jan 6, 2009

    but controlling a servo motor is more complex procedure compare to stepper motors,unless if the purpose is met
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  • Nishan

    Member • Jan 6, 2009

    Servo.
    Dont worry.it will be ok.
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  • sauravgoswami

    Member • Jan 6, 2009

    yeah servo is always good for feedback systems,if you feel servo is good then go for it.....i would like you to share the results with us and alos the roadblocks
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  • vasanthmbs

    Member • Jan 14, 2009

    from my knowledge servo is correct
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  • momin

    Member • Mar 8, 2009

    I'm facing the same problem these days. steppers are much cheaper than servo motors but the torque they deliver compared to their power consumption and weight is very poor. servo motors can provide large torque at 5 or 6 V (@200mA) only and they are only 45 gr. the motor weight should concern you if you are planning to attach the motors on the joints directly (no gears or belts) then the motor at the base joint should carry the end load plus all the other joints motors and links. please lets share our designs and schematics (my manipulator is a 4 degree of freedom and I'm using stepper motors)
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