LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
(2) Alignment with the Lathe.
(a) Before tightening the base of the unit in position, the face should
be lined up with the direction of travel.
When it is known that the
workpiece surface is true with the carriage travel, the versa-mil may be
aligned by bringing the basic unit face plate close up to even contact with
the workpiece surface.
(b) The
tailstock
quill
also
provides
a
similarly
used
reference
surface.
(c) Another method in aligning the unit with the lathe is to use the
lathe face plate or face of the chuck.
This is accomplished either by
truing the face of the basic unit against the lathe faceplate or chuck, or
using a square, parallels or protractor, depending on the setting used.
(d) When the versa-mil is mounted on the compound rest, the compound
should be set at zero degrees during alignment to give a direct reading of
any angular settings that may be required.
d.
Position of the Spindle.
(1) The lead screw on the versa-mil will accurately position the spindle
by moving the housing along the guide posts. The lead screw is 10 threads
per inch; the lead screw collar is calibrated to 0.001 inch.
(2) For direct reading of the depth of cut, the graduated collar may be
turned to read zero by turning and loosening the collar set screw.
(3) When the spindle has been brought into position, the housing should be
locked to ensure that an accurate depth of cut is maintained. The post lock
operates against both front posts. A right-hand turn of the post lock, with
a socket key, locks the spindle firmly in position.
The lock should be
released before operating the lead screw.
e.
Inserting and Removing the Arbors.
(1) Both spindle taper and arbor tapers are carefully and accurately
ground. Care should be taken to avoid the presence of any grit on either
surface when inserting the arbors. It is advisable
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