King is correct about the offset stuff -- but there's more info.
A) It's (usually) called a "cup center".
B) The reason for the offset is this: if you turn a piece with one end
centered (in the "live center", so named because it's attached to the
motor and thus directly driven), and the other end offset (in the "dead
center" -- in this case, your mystery part) -- the resulting piece, when
turned 'normally' (i.e., as if it's a straight cylinder) will come out
On Sat, 25 Dec 2004 16:40:11 +0000, S. A. King wrote:
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