Grizzly G9972Z Owner's Manual page 38

Figure 49.
Figure 49
Note: The thread dial is not used when cutting
metric threads. Leave the half-nut engaged until
the threads are complete.
DO NOT engage the half-nut when the spin-
dle speed is over 300 RPM. Ignoring this
instruction could result in damage to the
leadscrew or carriage components.
NOTICE