mounted on a floating head, which permit the rollers to exert equal pressure as they are pressed against
a rotating work piece. Knurling is a mechanical-working process, in which the metal on the surface of
the work piece is deformed rather than removed. Since greater forces are used in knurling, the work
piece should be well supported.
The work piece, although held in a chuck, is given extra support by the center of the tail stock. When
knurling, the knurling tool is forced to a workable depth into the work piece surface with the cross slide,
and then it is fed for the length of the desired knurl with the carriage.
This is repeated until final depth and a finished knurl is obtained. Since work pieces with various
diameters may be knurled, the circumference will seldom be equal to a whole number of the diamond
shaped patterns Thus after the first complete revolution; some fraction of a diamond ordinarily remains.
With continued knurling, this fraction of a diamond distributes itself evenly over the complete
circumference, so that it cannot be detected.
DRILLING WITH A LATHE
A drill is held in the tapered hole of the tail stock quill, which should locate it concentric with the rotational
axis of the spindle. The work piece to be drilled must be positioned so the desired hole is concentric
with the rotational axis of the spindle. Reamers, counter bores, and other cutting tools may be held by
the tail stock quill. They may be used after drilling.
PRODUCING TAPERS
The method to be used for producing a taper depends upon the length of the taper, included angle of the
taper, number of work pieces to be produced, and the available tooling and attachments. A taper may
be produced with the use of the compound rest.
Since the liner movement of a compound rest slide is limited, this method is suitable only for tapers no
longer than this movement.