-50-
Model G0768/G0769 (Mfd. Since 8/15)
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.
Each shaft has room to mount gears in two posi-
tions—forward and rear (see
Figure 64).
0.0037"
84
20
A
A
40
in/
C
C
D
D
B
B
E
E
F
F
80
80
80
30 72
33 80
30
0.0068"
Figure 64. Forward and rear gear positions.
Forward
Rear
Blank Area Indicates
Spacer (Not Shown)
0.0037"
84
20
A
A
40
in/
C
C
D
D
B
B
E
E
F
F
80
80
80
30 72
33 80
30
0.0068"
Figure 65. Lines indicate which gears mesh.
Gear Mesh
Lines
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.
Figure 68 identifies the end gears on the upper,
middle, and lower shafts. The gears are repre-
sented by letters.
Upper Shaft Gears
Figure 68. Identification of gears on shafts.
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30
33 40
65
70
80 60
60
60
60
63
63
53
9 10 11 12 13 14 16 18
50
50
55
80
80
80
80
80
8060
60
7153 55
33
30
55
55
4030
53
53
53 72
63
70
57
57 72
72
72
72 80
70 40
40
40
63
57
55
Lower Shaft Gears
Middle Shaft Gears
Upper Shaft Gears
The shaded boxes in
Figure 67 show the threads
per inch (TPI) on the applicable chart.
Figure 66 identifies the charts to use when set-
ting carriage feed movement for metric or inch
threading.
mm
n/1"
A
C D
B
E F
A
C D
B
E F
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71
7163
57
71
71
63
33 3060 40
40
50
60
84
80
50
60
20
80
80
80
63
63
80
60
70
70
70
57
72
80
80
30
33 53 30 60 40 40
40
30
33
70
0.50 0.60 0.70 0.80 1.00
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30
33 40
65
70
80 60
60
60
60
63
63
53
9 10 11 12 13 14 16 18
50
50
55
80
80
80
80
80
8060
60
7153 55
33
30
55
55
4030
53
53
53 72
63
70
57
57 72
72
72
72 80
70 40
40
40
63
57
55
Figure 66. Icons indicate inch or metric threads.
How to Read the Thread Charts
Inch Icon
Indicating
Threads per
Inch (TPI)
Metric Icon
Indicating
Thread Pitch
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30
33 40
65
70
80 60
60
60
60
63
63
53
9 10 11 12 13 14 16 18
50
50
55
80
80
80
80
80
8060
60
7153 55
33
30
55
55
4030
53
53
53 72
63
70
57
57 72
72
72
72 80
70 40
40
40
63
57
55
Figure 67. Numbers in shaded boxes indicate
the TPI or threads per inch.
Threads
Per Inch
(TPI)
