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Model G0740 (Mfg. Since 11/12)
-59-
Figure 84. Marks are selected on the dial for
threading even TPI not divisible by 4.
Non-
Numbered
Position
2,6,10,14,
18,22,26,
30,54
TPI
Thread Dial Chart
Find the TPI (threads per inch) that you want to
cut in the left column of the thread dial chart (see
Figure 82), then reference the dial number to
the right of it. The dial numbers indicate when to
engage the half nut for a specific thread pitch. The
thread dial chart can also be found on the front of
the thread dial housing.
4,8,12,16,20,24,
28,32,36,40,44,
48,56,60,72
Any
Position
Non-
Numbered
Position
Numbered
Position
1,2,3,4
Position
1,3 or 2,4
Position
1 Only
2,6,10,14,
18,22,26,
30,54
3,5,7,9,
11,13,15,
19,23,27
2½,3½,4½,
7½,11½,13½
2¼,2¾,3¼,3¾
Same as
Metric
Threads
1
2
3
4
In.
2
7
⁄
8
Figure 82. Thread dial chart.
Note: The thread dial is not used for metric
threading, or diametral and modular pitches. You
must leave the half nut engaged from the begin-
ning until the turning is complete for these types
of operations.
The following examples explain how to use the
thread dial chart.
TPI Divisible By 4
For threading a TPI that is divisible by four, use
any line on the thread dial (see Figure 83).
4,8,12,16,20,24,
28,32,36,40,44,
48,56,60,72
Any Position
TPI
Figure 83. Any position on the dial for threading
TPI divisible by 4.
Even TPI Not Divisible By 4
For threading a TPI that is even but not divisible
by 4, use any of the non-numbered lines on the
thread dial (see Figure 84).
Odd Numbered TPI
For odd numbered TPI, use any of the numbered
lines on the thread dial (see Figure 85).
Figure 85. Numbers are selected on the dial for
threading odd numbered TPI.
Numbered
Position
1,2,3,4
3,5,7,9,
11,13,15,
19,23,27
TPI
1
⁄2 Fractional TPI
Use any opposing number pairs—2/4 or 1/3 on
the thread dial for
1
⁄2 fractional TPI (see Figure
86). For example, to cut a 3
1
⁄2 thread, select 1 or
3 on the dial.
Figure 86. Opposing number group are selected
on dial for cutting
1
⁄2 thread TPI.
Position
1,3 or 2,4
2½,3½,4½,
7½,11½,13½
TPI