On Sun, 8 Jan 2006 19:41:33 +0000 (UTC), David Lesher
wrote:

Saw a show w/ a Japanese craftsman making a sword. Two layers of
different steels. Pounded it thin; folded it over; pounded...
Many layers later, that was the sword...

Right, but the entire blade is heat treated so that it is tempered,
rather than hard. If it were made from the kind of steel that
camshafts were cast from, it would be very brittle.

Not many camshafts, in low rpm engines, require forged camshafts,
there just isn't much pressure on them because they spin so slowly and
the valve springs aren't very stiff. But all camshafts require heat
treating the outer layer, or they'd wear out very quickly.

Corky Scott