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.