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Threading
The following subsections describe how to use
the threading controls and charts to set up the
lathe for a threading operation. If you are unfamil-
iar with the process of cutting threads on a lathe,
we strongly recommend that you read books,
review industry trade magazines, or get formal
training before attempting any threading projects.
Gearbox Threading Controls
The threading charts on the headstock face dis-
play the settings for inch and metric threading.
Using the controls on the lathe, follow the exam-
ple below to understand how to set up the lathe
for the desired threading operation.
To set dials for 22 TPI:
1.
DISCONNECT MACHINE FROM POWER!
2.
Install 32T and 48T gears, as instructed in
End Gear Configuration Example on Page
50.
3.
Locate 22 TPI, AC, and KT in chart below.
Levers Set to
K and T
PITCH
MM
Dials Set to
K
M
N
L
L
N
A and C
V
T
R
S
T
S
4 5.25 5.4 5.5
6
9
2
2.7
2.75
3
4.5
1
1.35
1.5
2.25
5 0.5
0.75
22 TPI
Figure 75. 22 TPI and corresponding dial and
T.P.I.
INCH
K
L
K
K
L
K
—"AC" indicates that the dials marked A-B
T
R
U
T
V
T
and C-D must be moved to positions "A"
48
46 52
and "C" (see Figure 76).
5¼ 5½
6
9
10 5¾ 6½
—"KT" indicates that the upper and lower
10½
11 12 18
20
11½
levers must be moved to positions "K" and
21 22 24 36
40 23 26
"T" (see Figure 76).
42 44 48
72
80 46 52
-52-
42
127
M
K
K
120
V
R
V
42
AD
3.5
3.6
4 5.25 5.4 5.5
BD
1.75
1.8
2
AC
0.9
1
BC
0.45
0.5
32
127
N
N
K
J
120
U
S
U
S
AD
10
3½
4
5¼ 5½
BD
5
7
8 10½
AC
2.5
14 16 21 22 24 36
BC
1.25
28 32 42 44 48
lever positions.
55
127
L
M
K
K
120
T
V
R
V
35
AD
1.75
1.8
2
BD
13
0.9
1
AC
0.45
0.5
BC
0.25
4.
Move quick-change gearbox dials and levers
to positions ACKT, as shown in Figure 76.
A-B Dial
C-D Dial
Figure 76. Gearbox dial settings for 22 TPI.
The lathe is now set up to cut 22 TPI threads.
PITCH
MM
Feed Direction Lever
M
N
L
L
N
J
When the lathe is set up as shown on the thread-
ing charts, the leadscrew is engaged with the
T
R
S
T
S
S
gears in the headstock and will automatically turn
6
9
10
when engaged by the feed direction lever (see
2.7
2.75
3
4.5
Figure 77). The leadscrew will not turn when the
5
feed direction lever is in the neutral position.
1.35
1.5
2.25
2.5
0.75
1.25
T.P.I.
INCH
K
L
K
K
L
L
T
T
V
R
T
T
48
46 52
6
9
10 5¾ 6½
Feed Direction
11 12 18
20
11½
13
40 23 26
72
80 46 52
Figure 77. Feed direction controls for threading.
MODULE
M
N
L
L
N
J
S
R
S
T
S
S
2.62
2.7
2.75
3
4.5
5
1.35
1.5
2.25
2.5
0.75
1.25
32
127
N
N
K
K
120
T
U
U
S
48
AD
3½
4
5¼ 5½
BD
7
8 10½
11 12 18
AC
14 16 21 22 24 36
BC
28 32 42 44 48
55
MODULE
127
M
K
K
M
120
FWD:
V
R
V
S
35
Feeds
AD
1.75
1.8
2
2.62
Toward
BD
Spindle
0.9
1
Lever
AC
0.45
0.5
BC
0.25
44
127
N
N
K
120
U
S
U
42
AD
7
8
10½
11
BD
14
16
21
22
AC
28
32
42
44
BC
56
64
84
88
Model G0782 (Mfd. Since 10/15)
Upper Lever
Lower Lever
T.P.I.
INCH
L
L
K
K
L
R
T
T
V
T
46 52
6
9
10 5¾ 6½
20
11½
13
40 23 26
72
80 46 52
Neutral
FWD
REV
N
L
L
N
J
REV:
R
S
T
S
S
Feeds
2.7
2.75
3
4.5
5
Away
From
1.35
1.5
2.25
2.5
Spindle
0.75
1.25
D.P.
K
L
N
K
K
T
T
R
V
R
12
13¹⁄ ³
18
20
24
26²⁄ ³
36
40
48
53¹⁄ ³
72
80
96
160
106²⁄ ³
144
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