Sharp 16 Series Manual page 36

THREADING PROBLEMS:
Should there be a problem cutting standard threads:
a. Check the chasing dial to see if it is loose from shaft.
b. Check gear at bottom of shaft for tightness & proper fit against the lead screw.
c. Check the half nut for proper fit.
Note: All Sharp Lathes are made to cut ASE (Inch) threads. To cut metric threads,
make sure the half nuts are engaged at all times, because it is not a metric based
machine, and therefore will not repeat according to the threading dials.
Notes:
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