In article , Harold & Susan Vordos says...

The Hardinge lathe that is termed a "second operation" lathe has an 8
station turret in place of the typical carriage, and no tailstock. They
are not an engine lathe, and lack a lead screw. They have thread cutting
ability thanks to master thread collars and followers. They are a very
accurate machine when in good condition.

The six station turret DV-59 (or its predescessor, the DSM-59
split bed) is typically called a second op machine. The chucker
is not usually identified as such, in my experience, and threading
is rarely done on the DV-59, as you say most often on an HC
chucker.

The DV59 can also be fitted with a real tailstock and
cross slide, and as such is called a toolmakers lathe, although
that term is usually reserved for an HLVH. The tiny
speed lathe with with dovetail bed is almost invariably
called a 'speed lathe.'

Example of a second op machine, with turret and cross slide:

http://www.metalworking.com/RCM-gallery/files/Rozen,Jim/Nshop1.jpg

in foreground. That is the older split bed style.

Jim

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