Passive Hip Rotation (cheap method)

[DirtyRoboto]

Here is something to try...

Why not use some barings between the hips and legs! (the barings of the type used in skateboard wheels).
Then you could use the servos to force rotation when needed. You would need to add some limits to the rotation and perhaps something to dampen the barings FOM.


Marcus.

[Humanoido]

Here is something to try... Why not use some barings between the hips and legs! (the barings of the type used in skateboard wheels). Then you could use the servos to force rotation when needed. You would need to add some limits to the rotation and perhaps something to dampen the barings FOM. Marcus

Are you saying no need to add another servo? If so, tell us more about how to accomplish this. How would it turn without adding another servo? And how would the bearing connect? I have plenty of those bearings here.
Humanoido

[plingboot]

I think he means you add some "free play" to the RN1 with the bearings and use jerky movements with the exiting servos - this would cause the upper and lower parts of the body to move independently - with momentum and a 'hard stop' creating the rotation.... i think

[Humanoido]

You're right! That's interesting, as it would be possible to have virtual humanoid joints where the rotation is set by three parameters - mass of the joint, inertial force issued and bearing friction. It makes sense. In the 90s there was a virtual space telescope and a CCD camera with virtual cooling. Now we could talk about inertial dampeners, and other cool stuff. In the 70's, the large Victor Business calculators used a small electromechanical clutch plate that handled motion control. It gives a guy all kinds of ideas... you could gain multiple motions depending on which multiple clutch was activated and which direction of motion occured with only one servo. I remember seeing long motor shafts with multiple EM clutches driving encoders in the early days of computers when they were a mix of mechanics and electronics. The shaft would rotate and the clutches would energize according to specific timing routines. Today, these timings could be software regulated.
Humanoido