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Operation and Safety
•
Chuck Key Safety:
A chuck key left in the
chuck can become a dangerous projectile
when the spindle is started. Always remove
the chuck key after using it. Develop a habit
of not taking your hand off of a chuck key
unless it is away from the machine.
•
Disconnect Power:
Disconnect the lathe
from power before installing and removing
the chuck or doing any maintenance or
adjustments. Accidental lathe startup can
cause severe injury or death.
6. Set the chuck on the back plate, aligning the
shoulder with the relief bore. Use a transfer
punch to mark the back plate. If a transfer
punch is not available, a drill bit of the same
size as the mounting holes in the chuck can
be used. Lightly tap on the bit, rotate it 90°
and tap it again.
7. Remove the chuck from the back plate and
center punch the marks. Drill and tap the
holes for M12-1.75 threads.
8. Remove the back plate from the lathe, and
place it in to a freezer for 30 minutes, and
place the chuck in an oven at 100° F. for the
same amount of time.
9. Put on insulated leather gloves and place
the chuck on the back plate. Line up the
mounting holes and thread in the cap screws
supplied.
10. Snug the first M12-1.75 cap screw, then al-
ternate the cap screws across the chuck until
you reach a final torque of 79 ft/lbs. Alternat-
ing the tightening process insures the chuck
will be pressed on straight. This step should
be repeated until the back plate fits snugly
against the chuck. If the chuck fits loosely on
the back plate, or is crooked on the shoulder,
it will be necessary to recut the back plate
face and shoulder again. If you are also in-
stalling the chuck by threading the M12-1.75
hex bolts into the chuck from the back side of
the mounting plate, repeat Step 9 on these
bolts, but torque them to 43.4 ft/lbs.
•
Secure Clamping:
A thrown workpiece may
cause severe injury or even death. When
swapping the chuck jaw positions, use a
torque wrench to re-torque the M12-1.75
jaw mounting cap screws to 79 ft/lbs. When
clamping a workpiece, maximum gripping
force is attained at full jaw and scroll gear
engagement. If jaw and scroll gear are par-
tially engaged, clamping force is reduced.
•
Speed Rates:
Operating the lathe where
maximum chuck speed is exceeded, or at too
high of a speed for an unbalanced workpiece,
can cause the workpiece to be thrown from
the chuck. Always use the appropriate feed
and speed rates. A thrown workpiece may
cause severe injury or even death.
•
Large Chucks:
Large chucks are very
heavy and difficult to grasp, which can lead
to crushed fingers or hands if mishandled.
Get assistance when installing or removing
large chucks to reduce this risk. Protect your
hands and the precision ground ways by
using a chuck cradle or piece of plywood over
the ways of the lathe when servicing chucks.
•
Safe Clearances:
Often chuck jaws will
protrude past the diameter of the chuck and
can contact a coolant nozzle, tooling, tool
post, or saddle. Before starting the spindle,
make sure the workpiece and the chuck
jaws have adequate clearance by rotating it
through its entire range of motion by hand.
•
Stopping Lathe By Hand:
Stopping
the spindle by putting your hand on the
workpiece or chuck creates an extreme risk
of entanglement, impact, crushing, friction,
or cutting hazards. Never attempt to slow
or stop the lathe chuck by using your hand.
Allow the spindle to come to a stop on its
own or use the brake (if equipped).
•
Long Stock Safety:
Long stock can whip
violently if not properly supported, causing
serious impact injury and damage to the
lathe. Reduce this risk by supporting any
stock that extends from the chuck/headstock
more than three times its own diameter.
Always turn long stock at slow speeds.
