Setup For Threading - Grizzly G0492 Owner's Manual

Setup for Threading

Your lathe is capable of cutting inch and metric
threads.
To setup for threading:
1. DISCONNECT THE LATHE/MILL FROM
POWER!
2. Refer to the Change Gear Chart on Page 31
or the chart on the inside of the change gear
door to determine the needed combination
of gears and which spindle location to install
each gear on.
See Figure 36 for examples of how gear com-
binations can achieve your needed threading
rate. For example: The chart shows that 24
TPI is needed.
Note: All change gears are stamped with the
number of teeth they have.
Inch
Threading
Figure 36. Using the change gear chart.
3. Loosen the lash adjuster (Figure 33) and
swing the assembly out of the way.
4. Remove the required E-clips, lubricate, and
swap out the appropriate change gears.
5. Move the lash adjuster so the gear backlash
is at 0.003" to 0.008", and tighten the lock
nut.
-30-
Longitudinal Cross
Feed Feed
6.
Use the leadscrew lever to select leadscrew
direction (Figure 37).
7. Setup the cutting tool, compound rest, and
cross slide to cut your threads; and loosen the
apron lock (Figure 35).
Leadscrew Lever
Figure 37. Threading controls.
— If cutting inch threads, refer to the Thread
Dial Table in Figure 38 to use the thread
dial.
— If cutting metric threads, do not use the
thread dial. Instead, you must leave the
half nut engaged until the threading opera-
tion is totally complete.
THREAD DIAL TABLE
LEAD SCREW PITCH 5 T.P.I.
T.P.I. DIAL
5 1-6
1 or 2
6
7 1
8
1
9 1
10 1-6
11 1
11.5
1 or 2
12
12.5
13 1
14 1 or 2
15 1-6
1 or 2
16
17 1
Figure 38. Thread dial table.
8.
Loosen the apron lock bolt and use the feed
lever (Figure 35).
9. While threading, keep your hand on the
half-nut lever, ready to disengage the apron
to avoid any potential for an apron/chuck
crash.
G0492 12" X 36" Combo Lathe/Mill
Thread Dial
T.P.I. DIAL
1 or 2
18
20
22 1 or 2
23 1
1 or 2
24
25 1-6
1 or 2
26
1 or 2
28
30 1-6
1 or 2
32
34 1 or 2
1 or 2
36
40 1-6
48 1 or 2