Model G9972Z (Mfd. Since 03/20)
-45-
Threading Controls
The purpose of this subsection is to orient you
with the controls used when threading and how to
use the threading dial on this machine.
Power Feed Lever
The power feed lever must be in the disengaged
position (down and horizontal) for threading oper-
ations or the half-nut will not engage with the
leadscrew (see
Figure 58).
Half-Nut Lever
The half-nut lever engages the carriage with
the leadscrew which moves the tool along the
workpiece (see
Figure 59).
Thread Dial & Chart
The numbers on the thread dial are used with the
thread dial chart (
Figure 61 on Page 46) to show
when to engage/disengage the half-nut during
inch threading operations.
The thread dial must be engaged with the
leadscrew to operate. To engage the thread dial,
loosen the mounting cap screw, pivot the thread
dial gear onto the leadscrew so the gear teeth
mesh with the leadscrew, then re-tighten the cap
screw (see
Figure 60).
NOTICE
NEVER attempt to engage the carriage
power feed (lever up) and the half-nut (lever
down) at the same time, and NEVER force
these levers. Always disengage the power
feed (lever down) before engaging the half-
nut. Otherwise, severe damage to the lathe
could occur.
Figure 59. Half-nut lever engaged/disengaged.
Disengaged (Off)
Engaged (On)
Figure 60. Thread dial.
Cap Screw
Thread Dial
Thread
Dial
Gear
Figure 58. Power feed lever disengaged.
Disengaged
Summary of Contents for G9972Z
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