Grizzly G0768 - How to Read the Feed Chart; How to Read the Thread Charts

-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
6060 60 63
63
53
9 10 11 12
13 14 16
18
50 50 55
80
80
80 80 80
80 60
60
71 53 55
33 3055 5540 30
53 53 53
72 63 70
57 57
72 72
7272 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 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
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
6060 60 63
63
53
9 10 11 12 13 14 16
18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
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
6060 60 63
63
53
9 10 11 12 13 14 16
18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 67. Numbers in shaded boxes indicate
the TPI or threads per inch.
Threads
Per Inch
(TPI)