Harmonic drive

<p>Jul 11, 2015 04:44 PM see video: &nbsp;nice explanation.</p>

<p>

Harmonic Drive company &nbsp;(in Massach.) &nbsp;is a staple of precision robotics.

I see them annually at robotics shows.</p>

<p>

zero backlash; &nbsp;exclt repeatability, positional accuracy, high torque to weight.

(but NOT cheap)</p>