Grizzly G4003G Owner's Manual page 55

Thread Dial
Tools Needed
Hex Wrench 5mm .............................................. 1
The numbers on the thread dial are used with the
thread dial chart to show when to engage the half
nut during inch threading. Loosen the cap screw
on the thread dial (see Figure 72), pivot the gear
teeth so they mesh with the leadscrew threads,
then retighten the cap screw.
IMPORTANT: The thread dial is not used for met-
ric threading. You must leave the half nut engaged
from the beginning until the threading is complete
for metric threading.
Thread
Dial
Figure 72. Thread dial engaged with the
leadscrew.
When threading, we recommend using the
slowest speed possible and avoiding deep
cuts, so you are able to disengage the half
nut when required and prevent an apron
crash!
When the first thread cutting pass is complete,
the operator disengages the carriage from the
leadscrew using the half nut lever. The operator
returns the carriage for the next pass and re-
engages the half nut using the same thread dial
setting to resume the cut as in the previous pass.
Model G4003G (Mfd. Since 1/15)
Thread Dial Chart
Qty
The thread dial chart is located on the headstock,
as shown in Figure 73.
Find the TPI (threads per inch) that you want to
cut in the left columns (under T.P.I.), then refer-
ence the dial number in the right columns (under
Scale). The dial numbers indicate when to engage
the half nut for a specific thread pitch as indicated
by the thread dial chart (see Figure 74).
Cap
Screw
Thread Dial
Chart
Figure 73. Location of thread dial chart.
INDICATOR TABLE
TPI SCALE TPI SCALE
4 1–8 13 1, 3
4.5 1 14 1-2-3-4
16 1–8
4.75 1
5 18
1, 3 1-2-3-4
5.5 1 19 1, 3
6 1-2-3-4 20 1–8
6.5 1 22 1-2-3-4
7 1, 3 24 1–8
8 1–8 26 1-2-3-4
9 1, 3 28 1–8
9.5 1 32 1–8
10 1-2-3-4 36 1–8
11 1, 3 38 1-2-3-4
12 1–8 40 1–8
Figure 74. Thread dial chart.
TPI SCALE
44 1–8
48 1–8
52
1–8
56 1–8
64 1–8
72 1–8
76 1–8
80 1–8
88 1–8
96 1–8
104 1–8
112 1–8
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