- #1

Temeraire

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I think the biggest torque will be when the forearm is parallel with the ground, so my calculation is something like this:

My forearm+hand+a little weight(aluminium structure, etc): m=3kg.

Gravitational acceleration: g=9.81 m/s2

The arm is a distributed load, for now let's say it is evenly distributed and the center mass is at halfway of the forearm: from the elbow it's s=20 cm=0.2m

So the Torque would be: T=3*9.81*0.2=5.89Nm.

Or going with the kg.cm: 60kg.cm.

I got a recommendation to choose a motor, for example this: https://media.digikey.com/pdf/Data%20Sheets/Seeed%20Technology/108990007_Web.pdf

But it says that the load torque is 0.55 kg.cm, so if my calculations are correct i would need hundred times more torque, which seems odd to me.

do you have any idea what i am missing, or calculating wrong?