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Sep 4, 2018 at 14:06 comment added Chuck @Roshan - If this is the answer that answered your question, please mark it as accepted by clicking the check between the up and down arrows to the left of the answer (and also consider upvoting this and any other answers that helped!)
Jun 30, 2018 at 17:39 comment added roaibrain ok cool, I tried it out and it helped me come to a quick solution of what lengths to use!
Jun 30, 2018 at 16:22 comment added NomadMaker The problem that I see is that the arm is 2 DoF on a turntable adding a 3rd DoF, but I'm ignoring the turntable for now. Think of the arm itself as a triangle. As the arm extends, the arm becomes straighter. Normal sized inexpensive arms with only 2 DoF will probably become so straight and low that other chess pieces will be knocked down. Another DoF on the arm will prevent this. Spending a few minutes with a cardboard prototype that you move by hand will quickly show you if I'm right or wrong.
Jun 30, 2018 at 5:58 comment added roaibrain That is a nice idea, but I would prefer some good mathematical solutions; if 3 DoF is not enough what design would you suggest I use?
Jun 29, 2018 at 13:25 history answered NomadMaker CC BY-SA 4.0