Thread Dial Chart
The thread dial chart is located on the apron, as shown in Figure 90.
Thread Dial
Chart
Figure 90. Thread dial chart location.
Find the TPI (threads per inch) that you want to cut in the left column on the thread dial chart (see Figure 91), then reference the dial number to the right. The dial numbers indicate when to engage the half nut for a specific thread pitch as indicated by the thread dial.
In. |
|
|
| 2 | 3 |
| 1 | 4 |
|
| |
4,8,12,16,20,24, | Any |
|
28,32,40,48,56 | Position | |
2,6,10,14,18,22, | Non- |
|
26,36,42,46,52, | Numbered | |
54 | Position | |
1,3,5,7,9,11,13, | Numbered | |
19,21,23,27,38, | Position | |
44 | 1,2,3,4 | |
1½,2½,3½,4½, | Position | |
5½,6½,9½,10½, | 1,3 or 2,4 | |
11½,13½ |
|
|
1¼,1¾,2¼,2¾, | Position | |
3¼,4¾,5¼,5¾, | 1 Only | |
6¾ |
|
|
Figure 91. Thread dial chart.
The following examples explain how to use the thread dial and the thread dial chart.
TPI Divisible by 4: Use any line on the thread dial (see example in Figure 92).
TPI | Dial Number | Thread Dial | |
4,8,12,16,20,24, | Any |
| 3 |
28,32,40,48,56 | Position |
| |
2 | 4 | ||
|
|
| 1 |
Figure 92. Any position on dial for threading TPI
divisible by 4.
Even TPI Divisible by 2: Use any non-numbered line on the thread dial (see example in Figure 93).
TPI | Dial Number | Thread Dial | |
2,6,10,14,18,22, | Non- |
| 3 |
26,36,42,46,52, | Numbered | 2 | 4 |
54 | Position |
| 1 |
Figure 93. Example of an inch thread pitch
divisible by 2.
Odd Numbered TPI & Even TPI Not Divisible by 8: Use any of the numbered lines on the thread dial (see example in Figure 94).
TPI | Dial Number | Thread Dial | |
1,3,5,7,9,11,13, | Numbered |
| 3 |
19,21,23,27,38, | Position |
| |
2 | 4 | ||
44 | 1,2,3,4 |
| 1 |
Figure 94. Example of an odd numbered inch
thread pitch.
Model G0746/G0749 (Mfg. Since 3/13) |