Southbend High Precision 6" Lathe Chuck SB1313 - Manual (Page 2)

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6. While the back plate is still installed in the
lathe, scribe a 147mm diameter centerline in
the face of the back plate. This centerline is
for the chuck mounting bolt holes.
7. Along the circumference of the centerline
just scribed, mark and center punch the
three mounting bolt hole locations 120°
apart.
8. Remove the back plate from the lathe and
drill three 7 ⁄
16
" diameter mounting holes
completely through the back plate.
9. Clean and stone all mating surfaces until
they are perfectly clean and no burrs exist.
10. Place the chuck in an oven, and then set the
oven to the warm setting. When the oven
reaches approximately 100° F, turn the oven
off and let the chuck sit in the oven for 30
minutes.
11. Place the back plate into a freezer for 30
minutes.
12. Put on insulated leather gloves and place
the chuck on the back plate. Line up the
mounting holes and install the three
supplied hex bolts finger tight.
13. Install the back plate and chuck onto the
lathe.
14. Working in an alternating pattern, tighten
the M10-1.5 chuck mounting hex bolts
until you reach a final torque of 30 ft/lbs.
Alternating the tightening process avoids
chuck warpage.
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.
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.