From: whit3rd@gmail.com   
      
   On Sunday, May 6, 2018 at 5:30:44 PM UTC-7, et...@whidbey.com wrote:   
   > I want to use a hobby BLDC motor to power a compact high speed   
   > spindle...24,000 to 40,000 RPM spindle that will fit in the space I   
   > want to put it.   
      
   At 40,000 rpm, an electric motor has high frequency AC on its soft iron   
   parts, and a permanent magnet rotor is hard (because magnets aren't   
   easily machinable) to balance.   
      
   Have you considered air-powered options?   At 25,000 rpm, a   
   dental handpiece is considered 'low-speed'.   I'd consider   
   the low-cost option of using those...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)