Grizzly G0492 - Manual (Page 31)

G0492 12" X 36" Combo Lathe/Mill
-29-
The carriage has longitudinal and cross slide
power feed capabilities. All directions reverse
when spindle rotation is reversed.
To set and engage the power feed:
1. DISCONNECT THE LATHE/MILL FROM
POWER!
2. Refer to the Change Gear Chart on Page
31 to determine the needed combination of
gears and which spindle location to install
each gear on. See
Figure 33 for the gear
installation locations that are referenced by
the chart.
3. See Figure 34 for an example of gear com-
binations that give the longitudinal and cross
slide rates. For example: The chart shows
that 0.0089" of longitudinal travel per revolu-
tion of lead screw is needed, or 0.0019" of
cross travel per revolution of lead screw is
needed.
Note: All change gears are stamped with the
number of teeth they have.
Figure 35. Leadscrew and feed levers.
Figure 33. Change gear locations.
D
C
A
B
N
M
Longitudinal
Feed
Cross
Feed
Inch
Threading
Lash
Adjuster
and
Lock
Nut
NOTICE
Feed rate is based on spindle RPM. Pay
close attention to the feed rate you have
chosen and be ready to disengage the
apron. Failure to do this may cause the
carriage to crash into the chuck.
Figure 34. Using the change gear chart.
Feed
Lever
Leadscrew Lever
Apron
Lock
Bolt
Setting the Power
Feed Rate
4. Loosen the lash adjuster (Figure 33) and
swing the assembly out of the way.
5. Remove the required E-clips, lubricate, and
swap out the appropriate change gears.
6. Move the lash adjuster so the gear backlash
is at 0.003" to 0.008", and tighten the lock
nut.
7. Use the leadscrew lever to select leadscrew
rotation direction ( Figure 35).
8. Loosen the apron lock bolt, and use the feed
lever ( Figure 35) to engage the cross slide or
longitudinal feed.