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Each shaft has room to mount gears in two posi-
tions—forward and rear (see Figure 64).
0.0037"
0.0068"
A
B
84
30 72
C
D
20
80
33 80
E
F
80
80
Rear
Forward
Figure 64. Forward and rear gear positions.
Both positions must be filled for the gears to work
properly. This also applies to "blank" areas on the
chart, such as the one right of the 80T (E) gear
in Figure 64 (the dashed box is used for identifi-
cation only). A spacer should be installed in this
position on the shaft. A spacer is not listed on
the chart because the chart only reflects ACTIVE
gear positions.
The lines shown between the numbers in Figure
65 identify which gears mesh.
0.0037"
A
B
84
C
D
20
E
F
80
Figure 65. Lines indicate which gears mesh.
For example, to set the feed rate for 0.0037 in./
rev., mesh the 30T (B) gear with the 80T (D) gear,
and mesh the 20T (C) gear with the 80T (E) gear.
-50-
in/
40
A
C
30
B
E
D
F
Blank Area Indicates
Spacer (Not Shown)
0.0068"
30 72
30
80
33 80
Gear Mesh
Lines
80
How to Read the Thread Charts
Figure 66 identifies the charts to use when set-
ting carriage feed movement for metric or inch
threading.
Metric Icon
Indicating
Thread Pitch
Inch Icon
Indicating
Threads per
Inch (TPI)
Figure 66. Icons indicate inch or metric threads.
in/
The shaded boxes in Figure 67 show the threads
per inch (TPI) on the applicable chart.
A
B
Threads
40
Per Inch
C D
(TPI)
E F
A
B
C D
E F
Figure 67. Numbers in shaded boxes indicate
B
the TPI or threads per inch.
Figure 68 identifies the end gears on the upper,
D
middle, and lower shafts. The gears are repre-
sented by letters.
F
Upper Shaft Gears
Upper Shaft Gears
Middle Shaft Gears
Lower Shaft Gears
Figure 68. Identification of gears on shafts.
Model G0768/G0769 (Mfd. Since 8/15)
mm
0.40
0.50 0.60 0.70 0.80 1.00
A
B
55
60
70
57
72
C D
80
30
70
33 53 30 60 40 40
30
E F
80
80
80
80
80
1.25 1.50 1.75 2.00 2.50 3.00
A
B
53
57
80
63
63
C D
71
63
7163
20
33 3060 40
71
E F
60
50
80
84
60
n/1"
9 10 11 12 13 14 16 18
A
B
53
57
55
57 72
63
72
C D
80 80
72 80
72
70 40
60
40
60
40
60
E F
30
30
33 40
65
70
80 60
19 20 22 24 32 40 44
A
B
53
53
60
53 72
63
70
C D
80
63
80 60
7153 55
4030
55
33
55
30
E F
50
50
55
80
80
80
80
9 10 11 12 13 14 16 18
53
57
55
57 72
63
80 80
72 80
72
70 40
60
40
60
30
30
33 40
65
70
19 20 22 24 32 40 44
A
53
53
60
53 72
63
80
63
80 60
7153 55
4030
55
33
50
50
55
80
80
80
C
E
9 10 11 12 13 14 16
53
57
A
B
C D
80 80
E F
30
19 20 22 24 32 40 44
A
B
53
53
C D
80
63
80 60
E F
50
80
40
33
70
70
40
71
50
57
63
72
57
40
60
63
80 60
70
55
30
80
55
57 72
63
72
72 80
72
70 40
60
40
60
40
30
33 40
65
70
60
53 72
63
70
7153 55
4030
55
33
55
50
55
80
80
80
8
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