Replies

1. 
   RalphBarker | Sep 20, 2012 08:51am | #1

   Power source

   Almost any rotational power source can be used with a flex shaft. Separate motors are often used due to convenience of placement on a bench or other work surface. RPM, in addition to hp, is a factor. You'll note that the Guinevere motor runs at 3600 rpm.

   Mc Master Carr is one source for chucks.

2. 
   oldwindowguy | Sep 20, 2012 05:13pm | #2

   Jacobs style drill chucks usually mount to a shaft or spindle with either a Jacobs taper or threads.  Taper mounts combine alignment and holding power in a single feature.  They require the end of the shaft be ground and heat treated, so its pretty much an OEM way of doing business.  Threaded mounts have standard 60 degree unified threads for holding combined with a smooth precision turned bore and shoulder to align the chuck to the spindle.  Anyone with an engine lathe can do this.

   I've seen drill chucks threaded directly onto some type of appliance motors (washing machine, I think)  that had the right threads.  The setup held up very well drilling small holes in a high production application.

   The grinder bearings may not be suited for much of an axial loads in a drilling application.

   Try Enco for the chucks.