Table of Contents
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120
42
AD
3.5
Modular Threading Configuration
BD
1.75
Install the 120/127T combo gear in the middle
AC
position with the 127T gear facing the headstock.
BC
Install a 55T gear in the upper position and mesh
with the 127T gear. Install a 35T gear in the
lower position and mesh with the 120T gear (see
Figure 69).
32
MM
127
L
N
J
120
55T Gear
42
127
T
S
S
120
AD
6
9
10
3½
42
BD
5
3
4.5
5
AD
AC
1.5
2.25
2.5
120/127T
14 16 21 22 24 36
BD
1.75
Gear
BC
0.75
1.25
28 32 42 44 48
AC
BC
35T Gear
55
INCH
127
L
K
L
120
32
R
T
MM
T
127
46 52
35
L
N
J
120
AD
10 5¾ 6½
1.75
Figure 69. Modular threading change gears.
T
S
S
BD
20
11½
13
AD
5
6
9
10
3½
AC
Diametral Threading Configuration
40 23 26
BD
5
3
4.5
5
BC
80 46 52
Install the 120/127T combo gear in the middle
AC
1.5
2.25
2.5
position with the 127T gear facing the headstock.
BC
0.75
1.25
Install a 44T gear in the upper position and mesh
with the 127T gear. Install a 42T gear in the
lower position and mesh with the 120T gear (see
44
127
Figure 70).
L
N
J
120
55
INCH
127
T
S
S
42
L
K
L
120
R
T
T
AD
44T Gear
5
3
4.5
5
46 52
35
BD
1.5
2.25
2.5
14
AD
10 5¾ 6½
1.75
AC
0.75
1.25
28
BD
8
20
11½
13
BC
56
120/127T
AC
6
40 23 26
Gear
BC
2
80 46 52
44
127
L
N
J
120
T
S
S
42
AD
5
3
4.5
5
Figure 70. Diametral threading change gears.
BD
1.5
2.25
2.5
-50-
AC
0.75
1.25
BC
M
K
K
M
N
L
V
R
V
T
R
S
T
3.6
4 5.25 5.4 5.5
6
1.8
2
2.7
2.75
0.9
1
1.35
1.5
0.45
0.5
0.75
T.P.I.
N
N
K
K
L
K
K
U
S
U
T
T
V
R
PITCH
48
M
K
K
M
N
L
4
5¼ 5½
6
9
10 5¾ 6½
V
R
V
T
R
S
7
8 10½
11 12 18
20
3.5
3.6
4 5.25 5.4 5.5
40 23 26
1.8
2
2.7
2.75
72
80 46 52
0.9
1
1.35
1.5
42
0.45
0.5
0.75
127
120
MODULE
42
AD
M
K
K
M
N
L
T.P.I.
BD
V
R
V
S
R
S
N
N
K
K
L
K
AC
U
S
U
T
T
V
1.8
2
2.62
2.7
2.75
48
BC
0.9
1
1.35
1.5
4
5¼ 5½
6
9
10 5¾ 6½
0.45
0.5
0.75
7
8 10½
11 12 18
20
0.25
14 16 21 22 24 36
40 23 26
32
127
28 32 42 44 48
72
80 46 52
120
D.P.
AD
N
N
K
K
L
N
MODULE
BD
U
S
U
T
T
R
M
K
K
M
N
L
AC
7
8
10½
11
12
13¹⁄ ³
V
R
V
S
R
S
BC
16
21
22
24
26²⁄ ³
1.8
2
2.62
2.7
2.75
32
42
44
48
53¹⁄ ³
0.9
1
1.35
1.5
64
84
88
96
106²⁄ ³
0.45
0.5
0.75
55
127
0.25
120
42T Gear
35
AD
D.P.
BD
N
N
K
K
L
N
AC
U
S
U
T
T
R
BC
8
10½
13¹⁄ ³
7
11
12
14
16
21
22
24
26²⁄ ³
28
32
42
44
48
53¹⁄ ³
56
64
84
88
96
106²⁄ ³
N
L
N
J
120
U
S
S
AD
9
10
3½
End Gear Configuration Example
BD
3
4.5
5
7
Follow the example below to better understand
AC
2.25
2.5
14 16 21 22 24 36
how to configure the end gears for inch threading.
BC
1.25
28 32 42 44 48
Tools Needed
Hex Wrenches 5, 6mm .................................1 Ea
Open-End Wrench 17mm .................................. 1
Open-End Wrench 19mm .................................. 1
55
INCH
127
L
L
M
120
32
To configure end gears for threading 22 TPI:
T
T
MM
127
V
46 52
35
N
L
N
J
120
1.
U
AD
1.75
T
S
S
BD
11½
13
AD
6
9
10
3½
AC
0.45
BD
3
4.5
5
7
BC
AC
2.25
2.5
14 16 21 22 24 36
PITCH
BC
1.25
28 32 42 44 48
Position Gear
M
K
K
M
N
44
V
R
V
T
R
127
3.6
4 5.25 5.4 5.5
3.5
Position Gear
L
N
J
N
120
55
INCH
127
1.75
1.8
2
2.7
2.75
T
S
S
U
42
K
L
L
M
120
R
T
T
Position Gear
0.9
1
1.35
AD
3
4.5
5
7
V
46 52
35
0.45
0.5
BD
2.25
2.5
14
AD
1.75
AC
1.25
28
Figure 71. Locating change gears for 22 TPI.
BD
11½
13
BC
56
AC
2.
T.P.I.
BC
N
N
K
L
K
3.
T
U
T
U
S
48
4.
K
K
3½
4
5¼ 5½
6
44
127
7
8 10½
11 12 18
V
R
L
N
J
N
120
14 16 21 22 24 36
18
20
T
S
S
U
42
28 32 42 44 48
36
40
AD
3
4.5
5
7
72
80
BD
2.25
2.5
14
144
160
AC
1.25
28
MODULE
BC
56
M
K
K
M
N
V
R
V
S
R
1.75
1.8
2
2.62
2.7
2.75
0.9
1
1.35
K
K
0.45
0.5
V
R
0.25
18
20
36
40
72
80
144
160
N
K
L
K
K
K
T
R
U
T
V
S
48
4
5¼ 5½
6
9
10 5¾ 6½
8 10½
11 12 18
20
11½
40 23 26
72
80 46 52
42
127
120
MODULE
42
AD
K
K
M
N
L
L
T.P.I.
INCH
BD
R
V
S
R
S
T
N
K
L
K
K
K
Locate 22 TPI on inch thread chart, then
AC
T
R
U
T
V
S
1.8
2
2.62
2.7
2.75
3
locate 32T upper position gear, 120/127T
48
BC
0.9
1
1.35
1.5
2.25
middle position combo gear, and 48T bottom
4
5¼ 5½
6
9
10 5¾ 6½
position gear (see Figure 71).
0.5
0.75
8 10½
11 12 18
20
0.25
40 23 26
32T Upper
32
MM
127
72
80 46 52
L
L
N
J
120
120/127T
S
T
S
S
D.P.
Bottom
AD
6
9
10
N
K
K
L
N
MODULE
BD
3
4.5
5
48T Bottom
S
U
T
T
R
K
K
M
N
L
L
AC
1.5
2.25
2.5
8
10½
11
12
13¹⁄ ³
18
R
V
S
R
S
T
BC
0.75
1.25
22 TPI
16
21
22
24
26²⁄ ³
36
1.8
2
2.62
2.7
2.75
3
32
42
44
48
53¹⁄ ³
72
0.9
1
1.35
1.5
2.25
64
84
88
96
106²⁄ ³
144
0.45
0.5
0.75
DISCONNECT MACHINE FROM POWER!
55
INCH
127
0.25
L
K
K
L
Remove headstock end gear cover.
120
R
T
V
T
46 52
35
While holding middle position gears, loosen
AD
9
10 5¾ 6½
arm support hex nut and cap screw (see
D.P.
BD
Figure 72) and slowly let gears pivot down
20
11½
13
N
K
K
L
N
and away from upper position gear.
AC
40 23 26
S
U
T
T
R
BC
72
80 46 52
8
10½
11
12
13¹⁄ ³
Upper
Position
16
21
22
24
26²⁄ ³
Gear
32
42
44
48
53¹⁄ ³
44
127
Middle
64
84
88
96
106²⁄ ³
144
L
L
N
J
Position
120
Gear
S
T
S
S
42
AD
3
4.5
5
Arm
Support
BD
1.5
2.25
2.5
AC
0.75
1.25
Arm Support
BC
Hex Nut
Figure 72. Arm support and end gears.
Model G0782 (Mfd. Since 10/15)
L
L
T
T
46 52
13
Qty
PITCH
M
K
K
M
N
L
V
R
V
T
R
S
3.5
3.6
4 5.25 5.4 5.5
N
J
1.75
1.8
2
2.7
2.75
S
S
L
L
T
T
0.9
1
1.35
4.5
5
46 52
0.45
0.5
2.5
1.25
11½
13
T.P.I.
N
N
K
K
L
K
U
S
U
T
T
V
48
3½
4
5¼ 5½
6
9
K
K
7
8 10½
11 12 18
V
R
N
J
14 16 21 22 24 36
20
S
S
28 32 42 44 48
72
40
4.5
5
80
2.5
160
1.25
MODULE
M
K
K
M
N
L
V
R
V
S
R
S
1.75
1.8
2
2.62
2.7
2.75
0.9
1
1.35
K
K
0.45
0.5
V
R
0.25
18
20
Arm Support
Cap Screw
36
40
72
80
D.P.
160
N
N
K
K
L
N
U
S
U
T
T
7
8
10½
11
12
13¹⁄ ³
14
16
21
22
24
26²⁄ ³
28
32
42
44
48
53¹⁄ ³
56
64
84
88
96
106²⁄ ³
MM
L
N
J
T
S
S
6
9
1
3
4.5
5
1.5
2.25
2
0.75
1.
INCH
K
L
L
R
T
T
46 5
10 5¾ 6½
20
11½
1
40 23 2
80 46 5
L
N
T
S
S
3
4.5
5
1.5
2.25
2
0.75
1.
K
K
R
V
R
18
20
36
40
72
80
144
16
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