Smithy GN1300 - Manual (Page 83)

Step 9: When you reach the end of the first cut, lift up on the half-nut
engagement lever, back the cutter out using the CATP feed and return the
cutter to the starting point.
Step 10: Feed the cutter in the desired amount for the next cut, wait for the
same number as before to come up on the dial and engage the half nut.
Continue making passes until you have completed the full depth of cut.
Using the Threading Dial to Cut Inch
Threads
The threading dial is used for cutting inch threads only. Special procedures for
cutting metric threads can be found in the section under “ Cutting Metric
Threading” on the next page.
The threading dial is a mechanical indicator for engaging the cutter at the exact
same point for each consecutive pass. The numbers on the dial have no
specific reference to pitch, but they provide a reference point so you can start
at the earliest available point and use the same number again for each
consecutive pass.
N o t e : When the carriage is moving and the half nut is engaged, you will notice
that the dial no longer rotates. This is normal.
Figure 10.5 Half Nut Engaged
Figure 10.6 Note the number on the threading dial as your
halfnut engages
Granite 1300 Series Operator’s Manual
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