Southbend SB1314 - Manual (Page 2)

6. Remove the back plate from the lathe and
place it on a workbench.
7. Set the chuck on the back plate, and roughly
align the chuck using the alignment set
screws.
8. 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.
9. Center punch the marks. Drill and tap the
holes for M10-1.5 threads.
10. Clean and stone all mating surfaces until
they are perfectly clean and no burrs exist.
11. Install the chuck and snug the M10-1.5 cap
screws in an alternating pattern until you
reach a final torque of 53.5 ft/lbs. Alternating
the tightening process avoids chuck warpage.
If you are installing the chuck by threading
the M10-1.5 hex bolts into the chuck from
the back side of the mounting plate, repeat
Step 11 on these bolts, and torque the bolts
to 30 ft/lbs.
12. Using a 6mm hex wrench, lightly snug all
four chuck alignment set screws.
13. Clamp a 1" diameter test blank into the
chuck, install a test indicator. Rotate the
chuck by hand and measure the chuck
concentricity.
14. Based on your readings, adjust the
alignment set screws to bring the chuck
into final alignment. The typical alignment
repeatability for the same diameter
workpiece when swapping will be 0.0005".
For maximum accuracy, clamp your
workpiece in the chuck and realign by
tightening or loosening the set screws. If
all the set screws are tight, correction of
alignment can also be done by loosening one
or more set screws.
Note: If the chuck must move 0.001" or less to
bring the workpiece into alignment, it is not
necessary to loosen the chuck mounting bolts
before using the adjustment set screws.
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.
• 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 the jaw and scroll gear are
partially engaged, clamping force is reduced.
• Chuck Speed Rating: Exceeding the
maximum rated speed indicated on the
chuck, or using excessive spindle speeds
with an unbalanced workpiece, can cause
the workpiece to be thrown from the chuck
causing a severe impact injury or even death.
Always use the appropriate spindle speed for
the job.
• 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 nearby components. Before starting
the spindle, make sure the workpiece and
the chuck jaws have adequate clearance by
rotating the spindle through its entire range
of motion by hand.
-2-
Mfg. Since 3/10 Model SB1314 I N S T R U C T I O N S