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For Machines Mfg. Since 8/09 Model SB1023
-27-
MAINTENANCE
4. Without letting any of the dogs or the lock
balls they contain fall out of the hub, use
a 2.5mm hex wrench to loosen the dogs
and position them at the 0°, 120°, and 240°
degree locations as indicated by the degree
scale on the hub (Figure 34).
Figure 34. Grinding wheel hub.
Degree Scale
Lock Ball Inside
Balance Dog
Dog Slot
Hub
Paper Washer
Note: Pay special attention to keep the dogs
engaged in the hub slot when they are loose.
If you lose any of the 4mm lock balls, it will
be impossible to continue this procedure
until they are replaced.
5. Using a slightly-oiled lint free cloth, wipe the
mating surfaces of the balancing arbor and
the internal hub taper perfectly clean, and
push the hub and arbor together, as shown
in Figure 35.
Figure 35. Installing the balancing arbor.
6. Place the balancing arbor onto the wheel
balancing fixture (Figure 33).
7. Spin the wheel so it rotates one full turn and
comes to rest with the heaviest side hanging
down at six o'clock. This may take a few
times to find the exact location.
8. Using a pencil, draw a line at the six o'clock
position to mark the heaviest side of the
wheel.
9. Line up the closest dog with the line you
just drew and lock it in place. This dog will
now be positioned at the heaviest side of the
wheel and will be called dog "A".
10. Using the scale, position the other two "B"
dogs so they are both evenly spaced 120°
degrees apart from dog "A". At this point all
dogs will be 120° apart from one another.
The "B" dogs are the two dogs you will move
to balance the wheel.
11. Rotate the wheel 90° degrees, let go, and
observe the direction that it rotates out of
balance. Move each "B" dog in one degree
increments, toward each other and away
from dog "A" to balance the wheel. For
example, depending on the amount of
balance correction, the distance between
the two "B" dogs will decrease, and the
distance between the "B" dogs and "A" dog
will increase. This step must be repeated
as many times as required until the wheel
will not rock back and forth by itself in any
position.
12. When you are satisfied with the wheel
balance, install the grinding wheel on the
machine, and run it for five minutes to verify
the wheel is in balance.
13. If any balance problems are detected, repeat
the balancing procedure.
Note: Some machinists will re-dress the grinding
wheel one last time at this point to ensure
ultra-high grinding precision.