Back on May 31, 2011, Steve-S'pore of the Yahoo group gingery_machines wrote
about a simple way to make a counterbore from a drill bit. This article puts
a little more text and some pictures around what he said.
If you are interested, please see
http://rick.sparber.org/emc.pdf
Thanks Steve!
Rick
[Non-text portions of this message have been removed]
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