Grizzly G4000 Owner's Manual page 43

Note: The thread dial chart can also be found on
the front of the change gear door.
Figure 59.
Figure 59
Note: The thread dial is not used when cutting
metric threads. Leave the half-nut engaged from
the beginning until the threads are complete.
NOTICE
DO NOT engage the half-nut when the
spindle speed is over 300 RPM. Otherwise,
damage to the leadscrew or carriage com-
ponents could occur.