I'm interested in making an arduino robotic arm for something that need precision and/or torque (like CNC), but first, I'm exploring/searching what I would need and how much it would cost.

What I intend to do is making its body as sturdy and solid as possible to minimise vibration, however, this means the body will become quite heavy.

But the heavy duty high-precision stepper motors are quite expensive (in my country's currency, of course), and if I need more than 3, it would cost too much for me.

I thought on using gear reduction to increase the the torque of a really small and cheap stepper motor, but I'm afraid it would be incredible slow. I'm not quite interested on super higher speeds, but something faster than a snail would be nice.

So I was wondering if there is a mechanism that allows multiple drive inputs in a single axis to increase torque without too many reduction gears.

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  • $\begingroup$ are you asking about one gear being driven by multiple motors? $\endgroup$
    – jsotola
    Sep 17, 2022 at 22:52
  • 2
    $\begingroup$ My sympathy for being low on funds -- been there, done that. You may get more bang for your buck using DC motors and gearing them down. Such motors certainly have more power for their size, but whether a DC motor + amplifier has more power for it's cost is something you'll have to determine for yourself, based on what's available to you. $\endgroup$
    – TimWescott
    Sep 17, 2022 at 23:04
  • $\begingroup$ @jsotola any type of geared mechanism that allows for power amplification with multiple motors $\endgroup$
    – Fulano
    Sep 18, 2022 at 11:51
  • $\begingroup$ Can you describe more about the application in the OP? Are you trying to build a robot arm or something else? You will need to consider what you want the arm to do - e.g. payload, speed, acceleration. $\endgroup$
    – guero64
    Sep 19, 2022 at 14:38


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