Dynabee/powerball wrist exerciser terminology

  • #1
Good day, and thanks for having me on you forum.

I’ve been searching the web for the terminology used to explain the principal involved that causes the Dynabee/powerball wrist exerciser, rotor center pin to rotate in an opposite direction, relative to each end of the center pin. I understand that a single rotor pin spins in an inner circular race or channel where by one end of the pin rides against the upper part of the guide and the other end spins against the lower part. This I understand eliminates conflict in the direction the pin moves in its channel guide. I find this a very interesting principal, unique to the wrist exerciser mechanism but I’m at a loss to explain it in simple terms.

Thank you
Robin Hooper.
 

Answers and Replies

  • #2
Well this post has been up for a little while now and since then I've found several patents describing the Dynabee dynamics and nowhere is a simple term or terms that describes the principal involved. But in my search I did come across induced electron spin that resembles this what I'm looking for and its called "induced perpendicular precession". Since this type of movement needs to be induced by an outside source and it causes a spin along the primary axis as well as causing precession these terms may suite very well. Anyways that's what I'll call it until I'm corrected. What do you think?
 
  • #3
Thanks to the many readers that have read my post. As I mentioned previous "untill I"m corrected". An even more accurate term is "Larmor precession". When an electron spin domain is induced/torqued by an electromagnetic field, it causes the domain to flip , if I understand this correctly, removing the EM field causes it to flop back. In the Dynabee application there is no EM field but this torque is replaced by the force form your hand.

Anyways, thanks again
 
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