Southbend 14" Turn-X Toolroom Lathe SB1039 - Manual (Page 58)

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For Machines Mfg. Since 5/11 14" TURN-X ® Toolroom Lathe O P E R A T I O N
The following subsections will describe how to
use the threading controls and charts to set up
the lathe for a threading operation. If you are
unfamiliar with the process of cutting threads
on a lathe, we strongly recommend that you read
books, review industry trade magazines, or get
formal training before attempting any threading
projects.
Headstock Threading Controls
The threading charts on the headstock face
display the settings for metric, inch, modular,
and diametral threading.
Using the controls on the lathe, follow along
with the example below to better understand
how to set up the lathe for the desired threading
operation.
Setting Metric Thread Pitch of 1.75
1. Make sure the end gears are in the standard
configuration, which is used for all metric
threading (refer to End Gears on Page 54
for detailed instructions).
2. Locate the line in the metric thread chart
that lists the setting for 1.75 threads per
millimeter, as illustrated in Figure 77.
Threading
Figure 77. Metric thread chart with 1.75 TPmm
highlighted.
.2 LT1Z
.225 LT2Z
.25 LT3Z
.3 LT6Z
.35 LT8Z
.4 LS1Z
.45 LS2Z
.5 LS3Z
.6 LS6Z
.7 LS8Z
.75 LT6Y
.8 LR1Z
1.2 LR6Z
1.25 LS3Y
1.3 LR7Y
1.4 LR8Z
1.5 LS6Y
1.75 LS8Y
2.0 LR1Y
2.5 LR3Y
3.0 LR6Y
3.5 LR8Y
4.0 HR3Z
4.5 HS2Y
6.5 HS7Y
7 HS8Y
8 HR1Y
9 HR2Y
10 HR3Y
11 HR4Y
12 HR6Y
13 HR7Y
14 HR8Y
mm
C
3. The configuration string of characters to
the right of the selected thread pitch (LS8Y)
displays the positions to set the threading
controls for a metric thread pitch of 1.75 (see
Figure 77).
Note: In the next step, use the chuck key to rock
the spindle back-and-forth to help mesh the
gears as you make adjustments.
4. Position the controls as follows:
Note: Each of the thread charts has a C or V
in the header that is to be used for all of
the listings in that chart. For the C, use
the left quick-change gearbox lever, and
for the V use the right.
L: Move the feed range lever to the low (Low)
position.
S: Point the middle quick-change gearbox
lever to the S.
8: Position the bottom gearbox lever in the 8
slot.
Y: Point the right gearbox lever to the Y.
The lathe is now set up to cut 1.75 TPmm
threads.