Grizzly G4003 Owner's Manual page 27

Metric thread selection:
The chart in Figure 23 lists 30 metric threads that
can be cut on the G4003. Five ranges are used on
the left hand quick change selector and 6 on the
right hand quick change selector. Additionally, 5
gear changes are necessary to accomplish all of
the available metric threads. These gear changes
take place on the left hand end of the machine.
See Figure 23.
The chart is divided into 3 main sections or
columns. Starting from the left: Gear diagram,
Combination of Gears and m/m Per Pitch.
To use the chart:
1.
Find the desired pitch in the chart.
2.
Below the m/m Per Pitch label are numbers.
Find the corresponding number above the
desired pitch and change the right hand quick
change lever to that position.
Figure 23. Metric thread chart.
Model G4003 (Mfd. Since 6/20)
3. To the left of the desired pitch is a small col-
umn with a letter. This letter indicates place-
ment of the left hand quick change lever.
Move the lever to the corresponding loca-
tion.
4.
In the "Combination of Gears" column are
3 small columns. Please note the "F" and
"G" at the top. The numbers below F and G
represent the number of gear teeth of a gear
included with the lathe. Find the gears that
have the corresponding number of teeth as
stated in the chart to the left of the desired
pitch.
Example:
The desired metric pitch is 1.25mm. Find this
number in the chart and find the number of teeth
of the two gears to the left. The F gear will need
to have 50 teeth and the G gear will need 60 teeth
(see Figure 24). A diagram on the left side of the
chart on the machine tells us the 50-tooth gear
goes on top of the middle gear and the 60-tooth
gear goes on the bottom.
60-Tooth
G Gear
Figure 24. Change gears for 1.25mm pitch.
50-Tooth
F Gear
-25-