[CR]question about "Micro-Milling" nomenclature?

(Example: Framebuilders:Brian Baylis)

From: <Bikerdaver@aol.com>
Date: Tue, 12 Oct 2004 13:18:17 EDT
To: OROBOYZ@aol.com, haxixe@gmail.com, richardsachs@juno.com
cc: classicrendezvous@bikelist.org
Subject: [CR]question about "Micro-Milling" nomenclature?

Listers- What is the proper technical name for that "Micro-Milling" stuff you see on the shaft of Campy NR seat-posts and the back of their drive side crank arms? I have been going all these years with not really knowing what the heck this is called, and kind of bluffing my way through, [sorry :^) ]. Richard and the rest of you technical type know?
cheers-
Dave Anderson
Cut Bank MT