On 11 Apr 2007 at 8:23, Ian White GM3SEK wrote:
< snip, snip >
> Drill exactly the right size of pilot hole (not too big, not too
> small)
Which brought to mind a question that I've been dealing with for
many, many years: "What is the correct size pilot hole for self-
tapping sheet metal screws?" I have always measured the screw at its
narrowest body diameter (i.e. not at the pointy tip) using a vernier
caliper with jaws that will fit to the bottom of the thread. [An old
machinist I knew always called it a "very near caliper" because the
measurement obtained was "very near the correct dimension."]
Anyhow, is there a chart like the tap-drill sizes vs. screw sizes
that I've been missing all of this time?
73,
George T. Daughters, K6GT
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