Posted by charles todd on January 01, 2009 at 16:34:50 from (205.242.95.141):
In Reply to: OT Drilling Concrete posted by GordoSD on January 01, 2009 at 07:19:22:
I read the first post but was unsure if you are using a conventional drill or a hammer drill. Concrete bits are only designed to work in a hammer drill. They will last a long time if used properly in a hammer drill. A conventional drill will burn the bit up shortly regardless of speed due to constant friction. The hammer action breaks up the concrete as it drill. There are Masonary bits that are for convetional drills for drilling block, brick, or morter only! Try to drill cured concrete with a masonary bit and likley it will dull before the hole is finished. Star drills are still available but why? They are slow and well, slow. Find a friend that has a hammer drill before you decide to star bit. I have drilled A LOT of holes in concrete. A true hammer drill bit used in a hammer drill should last 50 + holes through concrete, wire, rebar, aggergrate, ect.
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