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21
Procedure:
1.
With the Dial rotating, choose one of the numbered marks etched on the Thread Dial Indicator which corresponds to the “SCALE” number in the
THREAD SCALE INDICATOR TABLE (in this example, this could be 1, 3, 5 or 7).
2.
As the selected marked line of the Dial passes the etched reference mark on the Dial Indicator Housing, quickly and firmly engage the Auto Feed Lever
and thread cutting will begin.
3.
As the Cutting Tool approaches the end of the desired thread, quickly Disengage the Auto Feed Lever. Do Not switch off the Lathe.
4.
Retract the Cutting Tool using the Cross-Slide Feed Handle, noting the exact position on the Scale and the exact number of turns.
5.
Crank the Saddle back to the beginning and reset the Cutting Tool by WINDING IN the Cross Slide the exact number of turns previously wound OUT and
then continue to wind IN to the desired depth of cut.
6.
With the Lathe still running, observe the Dial Indicator and as the same selected marked line of the Dial from Step 2 passes the etched reference mark
on the Dial Indicator Housing, quickly and firmly engage the Auto Feed Lever and once again, thread cutting will begin.
7.
As in Step 3, quickly Disengage the Auto Feed Lever as the Cutting Tool approaches the end of the thread.
NOTE:
Engaging the Auto Feed Lever on the same exact number on the Dial Indicator while it passes the etched reference mark on the Dial Indicator
Housing will guarantee that the Half Nuts of the Auto Feed mechanism engage on the same thread on the Leadscrew every time, on every pass which
produces a perfect thread.
SWITCHING TO EXTERNAL JAWS
The Lathe is assembled with the Internal Jaws installed for clamping on the Outside of
a workpiece. The following procedure details how to replace them with the Included set
of Three External Jaws for clamping on the Inside of a hollow workpiece.
1.
The thread area of the three Jaws are not identical but are progressively
“stepped”
(FIG 23)
. They are also numbered 1, 2 & 3. This is to accommodate
the lead of the drive screw thread inside the Chuck. It is absolutely necessary to
install the Jaws in the correct order.
2.
Arrange the Jaws as depicted in
(FIG 24)
and assemble them in this order,
clockwise in the slots of the Chuck, turning the Chuck Key as they are inserted.
3.
Close the Jaws fully and make sure they all meet in the center. If a Jaw is out,
open the Jaws fully and exert pressure on the outstanding Jaw while turning the
Chuck Key until it snaps down into position.
4.
Re-check Jaws to make sure they all meet in the center. Repeat previous step if
one is out of position.
FIG. 23
FIG. 24
