Model G0740 (Mfg. Since 11/12)
-57-
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 unfamil-
iar 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 dis-
play 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 opera-
tion.
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 55 for
detailed instructions).
2. Locate the line in the metric thread chart that
lists the setting for 1.75 thread pitch, as illus-
trated in Figure 79.
Figure 79. 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
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 79).
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.
Threading
