For Machines Mfg. Since 7/09 | O P E R A T I O N | Model SB1016/SB1036 |
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.
In. |
|
2 | 3 |
1 | 4 |
4,8,12,16,20,24, | Any Position |
28,32,36,40,44, |
|
48,56,60,72 |
|
2,6,10,14, | Non- |
18,22,26, | Numbered |
30,54 | Position |
3,5,7,9, | Numbered |
11,13,15, | Position |
19,23,27 | 1,2,3,4 |
2½,3½,4½, | Position |
7½,11½,13½ | 1,3 or 2,4 |
2¼,2¾, | Position |
3¼,3¾ | 1 Only |
27⁄8 | 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 2-54 Not Divisible By 4
Use any of the
TPI
2,6,10,14, | Non- |
18,22,26, | Numbered |
30,54 | Position |
Figure 98. Marks are selected on the dial for threading
2-54 TPI.
Odd Numbered TPI
Use any of the numbered lines on the thread dial for threading the TPI shown in Figure 99.
TPI
3,5,7,9, | Numbered |
11,13,15, | Position |
19,23,27 | 1,2,3,4 |
Figure 99. Numbers are selected on the dial for
threading odd numbered 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 31⁄2 thread, select 1 on the dial, then start threading, using 1 or 3 as your reference points.
TPI 4-72 Divisible By 4
Use any line (position) on the thread dial, shown in Figure 97, for threading TPI divisible by four.
TPI
4,8,12,16,20,24, Any Position 28,32,36,40,44, 48,56,60,72
Figure 97. Any position marked on the dial can be
used for threading 4-72 TPI.
TPI
2½,3½,4½, | Position |
7½,11½,13½ | 1,3 or 2,4 |
