LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
(a) When round stock is to be machined, assemble the fixture plate to
the main body housing keeping the V-groove down. Secure the workpiece with
the stock clamps, using the jack screws to level the stock clamps. Select
the length required from the assortment of screws furnished.
(b) When machining large diameter stock, assemble the jack screws in the
stock clamps with the screw heads against the fixture plate.
(c) When machining flat stock, assemble the fixture plate to the main
body housing keeping the V-groove up.
Set the workpiece on the fixture
plate flange and clamp the workpiece in the same manner as for round stock.
Whenever the fixture plate is repositioned, it must be
realigned as previously described in step 3, paragraph
3b on page 83.
(d) The lead screw will accurately position the workpiece by moving the
main body housing along the guide posts. The lead screw has 10 threads per
inch, and the lead screw graduated collar is calibrated to .001 inch. For
direct reading, turn the lead screw graduated collar to zero by loosening
the collar set screw.
(2) Milling. Milling operations are performed with the workpiece clamped
to the fixture, and the milling cutter held in the lathe chuck or collet.
The workpiece may be hand fed in any direction; lathe power feeds may be
used for longitudinal or traverse travel.
The rigidity of the fixture assures accurate boring.
boring head is mounted in the lathe spindle.
The workpiece is predrilled
and mounted in the fixture. The machine is then turned on and the workpiece
fed into the boring head, this operation is continued until the proper size