Craig Dunn Clark on thu 30 jan 03
Additionally, the use of a cobalt bit will facilitate things. Use a bit of
oil to help keep things a bit cooler.
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
----- Original Message -----
From: "Glenn Allenspach"
To:
Sent: Thursday, January 30, 2003 10:02 AM
Subject: Re: drilling in an electric kiln
> If you are having trouble getting an accurate start drilling a hole in
> metal(drill bit wandering, etc.), get a center punch. It's an inexpensive
> tool that just about any hardware store carries. Measure to locate the
spot
> you want your hole to go, put the center of the punch on that spot,
> perpendicular to the surface, and give it a whack with a hammer. This'll
> leave a dimple. Put the tip of your drill bit into the dimple, and drill
> using low RPM's. Drilling with too high of a drill speed overheats and
dulls
> the tip if the drill bit. In especially tough metals, drill a small
diameter
> hole first, then use progressively bigger bits to reach the final
diameter.
>
> If you've never used a center punch, practice on a piece of scrap metal to
> get feel for the amount of force you want to whack it with.
>
>
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