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Posted to rec.crafts.metalworking
machineman
 
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Default Is there something like an inverted drill bit

No, it is called a hollow mill :-), but the chances of successfully
using it by hand for this purpose is very low. Better to take the motor
apart and get someone to turn the shaft or as others suggested, use a
stepdown adapter or bore the pulley.
to see one goto http://www.kbctools.com/usa/main.cfm and check out the
bottom of page 80, they show both solid and adjustable hollow mills

daniel peterman wrote:
It's called a file