Sum of torque

[dieter]

Hi EOW,


I watched #92 10 minutes, I still do not understand it, sorry. 


BR

[dieter]

Still studying it... wait a minute, do you mean the friction / no friction axles are bearings with no friction in clockwise rotation and much friction in counterclockwise rotation?


BR

[EOW]

Still studying it... wait a minute, do you mean the friction / no friction axles are bearings with no friction in clockwise rotation and much friction in counterclockwise rotation?

I'm not sure to understand. My goal is to slow down the disk (or sprocket) in the support frame reference WITHOUT return a torque on the support. Slow down the disk in the support frame reference = accelerate the disk in the labo frame reference.

1/ Forget the chain, it's possible to use only stems and a disk. The disk is on a support. If a disk don't turn in the labo frame reference, its angular velocity is -w if the support turns at w, ok ?

2/ Now, if I slow down the disk in the support frame reference, the angular velocity goes from -w to -0 in the support frame reference, the disk accelerates in the labo frame reference, ok ?

3/ The disk has magnets and can attrack the stem (steel), but there is friction in the axis between the stem and the disk. The friction gives heating (it's an energy). This energy come from the kinetic energy of the disk: the disk slow down in the support frame reference.

4/ I use the centrifugal force for eject the stem. I need to give an energy for eject the stem, the energy can come only from the angular velocity of the disk, so the angular velocity of the disk increases in the labo frame reference.

The only thing to verify is: the support musn't receives a torque, and if the axis of rotation of the disk has no friction, it's not possible to return a torque I think

Tell me if you don't understand, I can explain more

[EOW]

All could be fine with one disk, but in the labo frame reference the disk don't turn, so there is no centrifugal force, it's for that I would like to use 2 sprockets and a roller chain. But without return a torque on the support.

[dieter]

I even don't know what "Labo" means, I tried babelfish translation, not found.
I made some gears, like planetary gears, but basicly this is not really my field of expertise, so I hope you don't mind if I seem rather stupid 
I will read it again after some sleep. I didn't sleep since last year ^_^
BR