On Sun, 27 Dec 2009 13:26:02 +0000 (UTC), Hul Tytus wrote:

rec.crafts.metalworking
masonry drill warning

Anyone know why a 1/4 masonry drill has a warning "don't use on a drill press"
? This came from a local hardware store.

Hul

masonry bits, as supplied have a significant negative rake cutting edge. they
are meant to be used in a hammer drill with brittle materials. As supplied
they will perform very poorly on any metal. If you know enough to re-sharpen
them correctly for use when drilling hardened steel, you know enough to safely
ignore the warning :-)


Mark Rand
RTFM