[Arm-netbook] physics analysis needed of belt-driven pulley system

[Luke Kenneth Casson Leighton]

On Sat, Aug 19, 2017 at 3:34 PM, Hrvoje Lasic <lasich at gmail.com> wrote:

> so, when you say nema 17 you refer to dimensions of the motor, not torque.

 yes.  they're common enough that they're quite low-priced.

> look at face of motor. But you can have different torques at same size of
> the motor.

 yes.  for the purposes of the analysis (pulley / non-pulley) we
assume exact same motor.

> They increase the size of the motor in length. so you will be
> still able to alter torque to some extent no matter speed. Keep in mind
> that you are flexible here up to certain point. After that, if you need
> more torque you go to next bigger size of motor nema 23 or so.

 yes.  that also increases cost, and weight, not just the motor size
but also the holders, and also the ampage needed of the controller.
which again increases cost.   so, trying not to do that as it's not
necessary.

 l.