i've been researching robotic arms for a personal project. I'm a computer engineering student, made some projects with arduino but my knowledge about robotics is currently limited.

So i was wondering, what was the limitations of the robot arms in the market? I'm planning to build a 3 joint robotic arm, it will be used for light weight job (like dotting paper with pen). Would making this fast(Sorry, i don't really know how i could explain that further) and precise(0.01-0.001 mm) possible?

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    $\begingroup$ do you have the skill to build a mechanical device that has 0.01 mm precision in its motion? $\endgroup$ – jsotola Feb 19 at 19:08
  • $\begingroup$ I will get help, but you can answer the questions by assuming that i do. $\endgroup$ – tomrader Feb 19 at 19:13
  • $\begingroup$ if you have the skill to build such a thing, then it is possible $\endgroup$ – jsotola Feb 19 at 21:14
  • $\begingroup$ What is the surface of the area that needs to be covered by the arm? I.e., the size of the "paper". $\endgroup$ – virolino Feb 20 at 9:12

The robot arm can be made fast by making it light. Less mass to move allows higher acceleration which allows faster starts and stops.

The robot arm can be made precise by increasing stiffness. This is generally done by adding material.

Due to the slender nature and long unsupported nature of robot arms they are prone to movement and flex. Compared to CNC machines they are much less precise because of this.

Most robot arms on the market cannot get anywhere close to 0.01mm precision, let alone hit the same mark again. And this includes the smaller ones similar to what you are trying to build. (UR and Motoman smartseries)

I just checked the specs for a UR 3, repeatability (ability to hit the same mark multiple times) is +- 0.1mm.

If you can build something close to 0.01mm precision on a hobbyist budget I would be impressed.

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