For PCB drilling much higher RPM is desired. The very small die grinders with 1/8" collet are ideal for the application and if bought on sale I have seen them for $20. For more info search the group for "Boman air turbine" or look at message # #27702. Bertho [Non-text portions of this message have been removed]
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RE: [Homebrew_PCBs] Re: Want to attach motor to 1/8" COLLET
2012-10-04 by Boman33