Southbend South Bend 16 SPEED GEARHEAD LATHE SB1053 - Manual (Page 60)

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For Machines Mfg. Since 3/11 16-Speed Gearhead Lathe O P E R A T I O N
The following subsections describe how to use
the threading controls and charts on this lathe.
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 doing any threading
projects.
Setting Threading Controls
The threading charts on the headstock face
display the settings for metric, inch, modular,
and diametral threading.
For inch or metric threads, use the standard end
gear configuration. For modular or diametral
threads, use the alternate configuration
Use the controls on the lathe and follow along
with the example below to better understand
how to set up the lathe for the desired threading
operation.
Example: Metric Thread Width of 2.5mm
1. Make sure the end gears are in the standard
configuration, which is used for all metric
threading (refer to End Gears on Page 56
for detailed instructions).
2. Locate the line in the metric thread chart
that lists the setting for 2.5mm threads, as
illustrated in Figure 86.
Threading Controls
Figure 86. Metric thread chart with a width of 2.5 mm
highlighted.
.2 LCT12
.225 LCT2Z
.25 LTC3Z
.3 LTC6Z
.35 LTC8Z
.4
LSC1Z
.45 LSC2Z
2.0 LCR1Y
2.5 LCR3Y
3.0 LCR6Y
3.5 LCR8Y
4.0 HCR3Z
4.5 HCS2Y
5.0 HCS37
mm
3. The configuration string of characters to the
right of the selected thread pitch (LCR3Y)
displays the positions to set the threading
controls for a metric thread width of 2.5mm.
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 directed by the
configuration string (LCR3Y) as follows:
a) Move the feed range lever to the low (L)
position.
b) Point the left gearbox lever to the "C".
c) Point the middle gearbox lever to the
"R".
d) Position the bottom gearbox lever in the
"3" slot.
e) Point the right gearbox lever to "Y".
The lathe is now set up to cut a metric thread
width of 2.5mm.