[CR]How are cones hardened?

(Example: Component Manufacturers:Chater-Lea)

From: "Aldo Ross" <aldoross4@siscom.net>
To: <classicrendezvous@bikelist.org>
Date: Sat, 27 Oct 2007 08:09:01 -0400
Subject: [CR]How are cones hardened?

All this discussion about restoring damaged bearing surfaces leads me to ask how bearing cones are hardened? I've always assumed they are machined, heat-treated, then ground, but which ht process(es) is/are used?

Aldo Ross (buying lots of 17-4, 303, 304, 316, 660, 956, 1018, 1026, 2024, 4130, 4140, 4142, 4340, 6061, A36, A500, O-1, O-2, S1, and S2 in...) Middletown, Ohio, USA