Southbend SB1307 - Manual (Page 2)

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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 M10-1.5 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 M10-1.5 cap screw, then
alternate the cap screws across the chuck
until you reach a final torque of 53.5 ft/lbs.
Alternating 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 installing the chuck by threading
the M10-1.5 hex bolts into the chuck from
the back side of the mounting plate, repeat
Step 9 on these bolts, but torque them to 30
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 M8-1.25
jaw mounting cap screws to 29 ft/lbs. When
clamping a workpiece, maximum gripping
force is attained at full jaw and scroll gear
engagement. If jaw and scroll gear are
partially 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.