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PM-1236 v4 1-2017.indd
Figure A2 Headstock attachment screws, RH
Figure A3 Headstock attachment screws, LH
Remove the large transposing gears for access to
these screw heads.
Figure A4 Adjustment screws below the headstock
The recessed socket head screws lock the adjustment by pull-
ing the tab rail toward the lathe bed. Loosen the socket heads
a fraction before touching the hex heads.
PM-1236 HEADSTOCK ALIGNMENT
Figure A1 is an exaggerated view of what happens if
the spindle is not precisely aligned with the lathe bed.
This is correctable by slightly loosening the attachment
screws, Figures A2 and A3, then adjusting the screws
set into a tab rail below the headstock, Figure A4.
CAUTION!
Correcting headstock misalignment is a multi-step pro-
cess requiring a number of extremely small adjust-
ments, each one followed by an alignment test, either
cut-and-try, or one of the other methods described previ-
ously.
A scarcely detectable rotation of an adjusting screw
can be the difference between perfect alignment and
unacceptable taper. In other words, think in terms of
thousandths of an inch or less. Simply loosening the
socket heads, Figure A4, can be enough to correct a
taper problem — or add to it in the wrong direction.
Figure A3 Misaligned headstock
In this illustration the workpiece diameter increases as the cut-
ting tool moves toward the chuck. Correct this by screwing in
(A) a fraction of a turn to rotate the headstock counter clock-
wise, moving the workpiece away from the tool. Screw in (B) if
the taper is in the other direction, thinner toward the chuck.
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