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11. After advancing the carriage by about 1",
rotate the carriage handwheel in the
opposite direction to move the cutting tool
back past the right end of the workpiece.
This movement may be done fairly quickly.
12. Note that as the tool moves to the right, it
may leave a spiral groove in surface of the
work. For this reason, the tool usually is
withdrawn
carriage back to the starting point.
13. Repeat
steps
comfortable with the steps of the turning
procedure.
14. Repeat steps 9-12 two more times, but with
the following variation:
15. When the tool has reached the end of its
travel towards the chuck, make a note of
the current dial reading of the cross-feed.
16. Now rotate the cross-feed dial one full turn
counterclockwise to move the tip of the
cutting tool away from the surface of the
workpiece.
17. Move the carriage back to the right end of
the workpiece to begin the next pass.
18. Rotate the cross-feed dial about one full
turn back to the setting that you took note
of in step 15, then advance it by an
additional 5 divisions.
19. Continue as before. In this variation of the
procedure, the tool is withdrawn to avoid
making a spiral groove on the workpiece
when the carriage is moved back past the
end of the workpiece.
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Turning Cut
slightly before moving
9-12
until
you
20. When you are familiar with this process,
move the carriage away from the end of the
workpiece and press the Stop button.
This process has reduced the diameter of the
workpiece and produced a smooth even finish
of a specific diameter. In actual operating
practice, a digital caliper or micrometer would
be used to check the diameter of the
workpiece
approached, resulting in a final diameter
exactly as needed for the specific project being
done.
Turning with Power Feed
In the next exercise, we will repeat the turning
process using the power feed feature. The
steps are essentially the same except that the
power feed is used to move the carriage
towards the headstock.
the
Note: the following operation assumes that the
gear train is set up to the factory default
are
configuration. If the gear train has been
changed from the default, do not attempt this
exercise as the feed rate may be too fast for
safe operation. Verify that the factory default
gears are in place and that the gears are
engaged to turn the leadscrew. If necessary,
loosen the locking bolt for the gear train
assembly and swing the gears to mesh with
the spindle drive gear, then lock the bolt.
Caution: when the carriage is moving under
power feed, the carriage handwheel will rotate.
Keep hands and tools clear of the rotating
handwheel. The handwheel may be pulled
towards the operator to disengage it so that it
does not rotate when power feed is in use.
Caution: When the power feed lever is
engaged, the carriage will move under power
towards the headstock. Great care must be
taken to ensure that the carriage and/or tool do
not run into the rotating chuck.
The workpiece should have at least 2" of stock
extending from the chuck jaws to provide
sufficient room to work. Running the carriage
into the chuck can damage the chuck, the
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as
the
desired
diameter
is
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