The center is the worst so it is drilled out with a smaller
drill - a.k.a. pilot hole for the web.
Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Proctologically Violated©® wrote:
Awl--

Volume-wise, of course.
Opinions?

I read some time ago somewhere that it was drilling.

This surprised me, as I thought the drill point, being essentially zero sfm,
would act as a limiting factor.
Intuitively I figgered it would be lathe turning, as the tool is moving
along a large surface, so chip removal is almost a non-issue, and coolant is
"more effective" than it would be on a buried cutter, and here the tool is
essentially never buried, etc.

But mebbe it could be something like a large-kerf circular saw blade?
Mebbe a saw blade moving along like a Dumont grinder on a lathe??

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