Southbend 18' & 60: EVS Toolroom Lathes 220v sb1016 - Manual (Page 59)

For Machines Mfg. Since 7/09 Model SB1016/SB1036
-57-
O P E R A T I O N
Using Thread Dial and Chart
Find the TPI (threads per inch) that you want
to cut in the left column (see Figure 96), 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
In.
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
2 7 ⁄ 8
1
2 3
4
Same as
Metric
Threads
Figure 96. Thread dial chart.
The thread dial is not used for metric, diametral,
or modular pitch threading. You must leave
the half nut lever engaged from the beginning
until the threads are complete for these types of
operations.
The following examples explain how to use the
thread dial chart.
TPI 4-72 Divisible By 4
Use any line (position) on the thread dial, shown
in Figure 97, for threading TPI divisible by four.
Figure 97. Any position marked on the dial can be
used for threading 4-72 TPI.
4,8,12,16,20,24,
28,32,36,40,44,
48,56,60,72 Any Position
TPI 2-54 Not Divisible By 4
Use any of the non-numbered lines on the thread
dial for threading the TPI shown in Figure 98.
TPI
Figure 98. Marks are selected on the dial for threading
2-54 TPI.
Non-
Numbered
Position 2,6,10,14,
18,22,26,
30,54
TPI
Odd Numbered TPI
Use any of the numbered lines on the thread dial
for threading the TPI shown in Figure 99.
Figure 99. 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: 1 & 3 or 2 & 4 or
on the thread dial for
1 ⁄
2
fractional TPI (Figure
100). For example, to cut a 3 1 ⁄
2
thread, select 1
on the dial, then start threading, using 1 or 3 as
your reference points.
Figure 100. 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