Southbend SB1001 - Manual (Page 46)

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For Machines Mfg. Since 8/11 Model SB1001 8K ™ Lathe O P E R A T I O N
When threading, we recommend using the
slowest speed possible and avoiding deep
cuts, so you can more easily disengage the
half nut to prevent an apron crash!
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 64), 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 body.
Figure 64. Thread dial chart.
Any Position
Any
Numbered
Position
2 Only
or 4 Only
4 Only 11, 13, 19
10, 14, 18
12, 20, 28
16, 24, 32
in.
Note: The thread dial is not used for metric
threads—you must leave the half nut engaged
from the beginning of the cut until the threads
are complete for metric threading.
The following examples explain how to use the
thread dial chart for inch threads.
16, 24, or 32 TPI
For each of these thread pitches, use any line on
the thread dial (see Figure 65).
Figure 65. Any line on the dial for threading 16, 24, or
32 TPI.
2
2
2
4
4
4 Any Position 16, 24, 32
Any
Numbered
Position
12, 20, 28
2 Only
or 4 Only
10, 14, 18
4 Only 11, 13, 19
TPI
12, 20, or 28 TPI
For each of these thread pitches, use any
numbered position (2 or 4) on the thread dial (see
Figure 66).
10, 14, or 18 TPI
For each of these thread pitches, use only the 2
positions or only the 4 positions (see Figure 67).
11, 13, or 19 TPI
For each of these thread pitches, use only the 4
positions on the thread dial (see Figure 68).
Figure 68. Only the 4 positions on the dial for
threading 11, 13, or 19 TPI.
2
2
2
4
4
4
Any Position 16, 24, 32
Any
Numbered
Position
12, 20, 28
2 Only
or 4 Only
10, 14, 18
4 Only 11, 13, 19
TPI
Figure 66. Any numbered position on the dial for
threading 12, 20, or 28 TPI.
2
2
2
4
4
4
Any Position 16, 24, 32
Any
Numbered
Position
12, 20, 28
2 Only
or 4 Only
10, 14, 18
4 Only 11, 13, 19
TPI
Figure 67. Only the 2 positions or only the 4 positions
on the dial for threading 10, 14, or 18 TPI.
2
2
2
4
4
4
Any Position 16, 24, 32
Any
Numbered
Position
12, 20, 28
2 Only
or 4 Only
10, 14, 18
4 Only 11, 13, 19
TPI