Grizzly G0791 Owner's Manual page 65

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The following examples explain how to use
1–8
the thread dial and the thread dial chart.
ALL
Even TPI: For threading an even number TPI,
use any numbered line on the thread dial (see the
example in Figure 94).
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1–8
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&
1-2-3-4
N
Figure 94. Any numbered line on dial for
threading even TPI.
Note: For TPI divisible by 4, this rule still applies.
The Indicator Table on the lathe shows that lines
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1–8 may be used, which means that lines 1–4 and
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any of the half marks may be used.
1
1
Odd TPI: For threading an odd number TPI, use
any pair of opposite numbers or marks on the
thread dial (see the example in Figure 95).
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1, 3
1, 3
Figure 95. 1 or 3 line on dial for threading odd
TPI.
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ANY
ANY
Model G0791 (Mfd. Since 9/15)
1
1
1
1
1
1
1
1
1
1
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N
Fractional TPI: For threading a fractional TPI with
a half number (4.5, 5.5, 6.5, 9.5), only use the 1
line on the thread dial (see the example in Figure
96).
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1
Figure 96. 1 line on dial for threading fractional
TPI.
Important: For cutting 4.75 TPI, proceed as
though cutting a metric thread and do not disen-
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gage the half nut until the threading operation is
1, 3
complete. Stop the spindle at the end of each cut,
retract the cutting tool, and reverse the spindle to
return the cutting tool to the start of the thread.
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ANY
1
1
1
1
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