Grizzly 60773 User Manual

Model G0773 (Mfd. Since 12/14)

-49-

Threading

The  following  subsections  will  describe  how  to
use the threading controls and charts to set up the
lathe for a threading operation. If you are unfamil-
iar with the process of cutting threads on a lathe,
we  strongly  recommend  that  you  read  books,
review  industry  trade  magazines,  or  get  formal
training before attempting any threading projects.

Headstock Threading Controls

The threading charts on the headstock face dis-
play the settings for inch and metric threading.

Using the controls on the lathe, follow the exam-
ple below to understand how to set up the lathe
for the desired threading operation.

To set dials for 72 TPI:

1. Arrange gears in Primary Threading

Configuration, with 30T gear in "G" position,
as explained on

Page 46.

2. Locate 72 TPI on the inch threading chart

below.

Figure 76. 72 TPI and corresponding dial

positions.

72 TPI

Alpha Dial

Numeric Dial

Figure 77. Gearbox dial settings for 72 TPI.

3. Locate A above 72 TPI and find 1 to the left

of it.

Note:

In the next step, use the chuck key to

rock the spindle back-and-forth to help mesh
the gears as you make adjustments.

4. Position gearbox dials, as shown in Figure

77.

The lathe is now setup to cut 72 TPI threads.

Apron Threading Controls

Figure 78. Apron threading controls.

Half Nut

Lever

Thread Dial

The half nut lever engages the carriage with the
leadscrew, which moves the carriage and cutting
tool along the length of the workpiece for thread-
ing operations (see

Figure 78).

Engaged

Disengaged

When threading, use slowest speed pos-

sible and avoid deep cuts, so you are able to

disengage half nut when required to prevent

a carriage crash!