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This question already has an answer here:

I am new working with robotic arms but I am having trouble finding the correct servo for the base of the arm.

It is a 2 link robot - each link weighs 1.2 kg and is 40 cm long. I have a gripper of 10 centimeters. The servo in the gripper can hold a max of 4kg. The whole robotic arm, including the maximum load it will carry and the servos and other accessories, is 8.3 kg. The maximum load it needs to carry is 4 kg at the end of the arm at 90 cm.

What servo could I use to move the rotary base and what servo could I use to lift the arm in the base? The last one is to move the link so it would be preferable to have a 2 axis servo.

The only specification I need right now is what servo to use my energy supply are two 12 volts DC batteries connected in series with 18Ah. I need the servo to be DC. The other things can be worked around the servo that can best do the work.

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marked as duplicate by Chuck, Ian, Ben, Mark Booth Mar 8 '16 at 14:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Please add a sketch or diagram of your proposed arm (with dimensions and masses). $\endgroup$ – Ben Mar 2 '16 at 0:31
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    $\begingroup$ I voted to close this because it's ultimately a shopping request. I referenced the other question to give OP a guide on calculating the required torque - nobody ever takes acceleration into account. Once you can find the torque and power you need (you've already fixed voltage), you can Google servos (just as well as any of the rest of us can). Also, it's not especially clear if you require a DC motor with position control (a classic servo) or if a stepper motor is acceptable, but you may find a larger offering in stepper motors. $\endgroup$ – Chuck Mar 3 '16 at 23:09
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The only servo I can think about, for your case, is the HS-7950TH. It can operate between 4 and 7 volts and 300 mAh at max.

With its titanium gears, it has maximum stall torque of 35 kg when used with 7 volts and 300 mAh, that should be enough for your requirements.

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  • $\begingroup$ kg is not a unit of torque. $\endgroup$ – Chuck Mar 3 '16 at 23:00
  • $\begingroup$ Their site says 35 Kg/cm.... so I guess ultra torque is a different (probably better) unit than normal torque? $\endgroup$ – hauptmech Mar 4 '16 at 3:32
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Also you might want to take a look at Dynamixel servos. They are the mot powerful I have found with a suprisingly open control system.

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