Dimetrial And Modular Pitch Threading - Grizzly G0600 Manual Insert

Dimetrial and Modular
Pitch Threading
NOTICE
Some threading operations may damage
the lead screw if performed at high speeds.
Always use the slowest speed possible for
your particular operation!
This lathe comes with one 48-Tooth and two 57-
Tooth change gears installed for cutting inch or
metric threads. However for cutting dimetrial or
modular threads the lower 57-Tooth gear must be
replaced with the included 42-Tooth gear, and the
66-Tooth gear must be installed onto the shoulder
of the center 57-Tooth gear (Figure 57). Gear
positions must also be changed.
To setup the lathe to cut dimetrial or modular
pitch threads:
1. DISCONNECT MACHINE FROM POWER!
2. Open the side cover and familiarize your-
self with the orientation of the change gears
(Figure 57).
48-Tooth Gear
(Upper Spindle)
57-Tooth Gear
Center Spindle
57-Tooth Gear
(Lower Spindle)
Figure 57. Change gear setup for inch and
metric thread cutting.
-42-
3.
4.
Adjustment
Arm
Locknut
5.
6.
Put on your safety glasses, and using a
14mm wrench, remove the center spindle
and gear assembly (Figure 58).
Spindle
66-Tooth
Bolt Hole
Figure 58. Center spindle, 57-tooth gear, and
66-tooth gear.
Using retaining ring pliers, remove the retain-
ing ring from the spindle (Figure 59).
Spindle
57-Tooth
66-Tooth
Figure 59. Spindle and center gear assy.
Use a press to remove and flip the direction
of the spindle, then install the retaining ring.
Note: You must use a press and a collar
that will support the inner bearing race when
removing the spindle from the gear. Do not
use a hammer and punch to drive the spindle
from the gear assembly or you will damage
the ball bearings.
Note: When finished, and installed back on
the lathe, the spindle must hold the 66-tooth
gear outward as shown in (Figure 63).
Place the bore of the 66-tooth gear onto the
shoulder of the 57-tooth gear, and align the
three bolt holes (Figure 58) of the gears.
G0600 20" x 60" Big Bore Lathe
57-Tooth
Shoulder
Center Race
Retaining Ring