Depends on the type of material, Sheet metal, plate and tubing all us a
little different approach. Proper drill speed and the right drill bit angle.
In many cases I use a pilot hole and a spot face on thin metals, they don't
grab the metal and rip it or break your wrist when a larger drill bit grabs
and re locates it across the shop or your gut.
Glen
----- Original Message -----
From: "Benn" <karhu@california.com>
To: "landspeed@autox.team.net" <land-speed@autox.team.net>
Sent: Tuesday, September 25, 2007 11:40 AM
Subject: [Land-speed] larger-than-tiny holes
> Hey all, for larger holes, my sense was that you want to make a pilot hole
> at
> least as large as the length of the line-junction of the two cutting lips.
> (And if I was more knowledgeable, I'd know the right terms for these parts
> of
> the bit). So, a 1/8" pilot hole should suffice for a 1/2" final drill,
> right?
> Benn
> Subject: Re: [Land-speed] tiny holes
>
>
> Good idea Rich, I use center drills for 99% of the holes I drill. I also
> step drill to the larger sizes and in some cases ream for a good fit. Us
> old
> aircraft people were taught the proper way.
> Glen
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>
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