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Re: [Shop-talk] Safety Wire Drill Guide

To: Shop Talk <>
Subject: Re: [Shop-talk] Safety Wire Drill Guide
From: PJ McGarvey <>
Date: Mon, 4 Feb 2013 21:12:45 -0500
References: <SNT127-W29D0083EC6F5E7CCC87CAF9A010@phx.gbl>, <> FILETIME=[4CD2F1D0:01CE0346]
Nope, I didn't even realize that was something people were doing - and I'm
wondering why (though I'm guessing something to do with the strength of the
bolt head for torquing?).
Maybe a thicker drill bit wouldn't have a problem bending and breaking so
easily, almost seems like you're asking for trouble by using that guide and
with such a small bit.

> From:
> CC:
> Date: Mon, 4 Feb 2013 11:02:58 -0800
> Subject: Re: [Shop-talk] Safety Wire Drill Guide
> > Not sure if there's any secret here.  I've drilled a dozen
> > 1/8" safety wire holes in Grade 8 bolts before using a single
> > cobalt bit in a drill press, and without the tool you linked
> > to -
> But did you start on the corner of the bolt head?  That's what the
> tool is designed to do; and it has a guide right next to the bolt head to
> hold the drill on-center to the corner.  Seems to me that even a cobalt bit
> is going to grab the corner of the bolt head and bind or break; unless you
> grind a small flat for the bit to start into.
> -- Randall
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