Tubes loaded into swinging bucket rotors must be
symmetric, around the axis of rotation. Verify this by
rotating the entire rotor 180°, by hand. The loads should be
in the same apparent positions (not mirror images). In
addition, the loads within each bucket must, also, be
symmetric around the bucket’s pivot axis. Verify this by
ensuring that each bucket is loaded so that it does not tilt
from the vertical, when the rotor is at rest. Maintaining
balance within each bucket ensures that the bucket and the
tubes swing out to horizontal, when the rotor reaches
operating speed, applying centrifugal force toward the
bottom of the tubes. Failure to achieve full swing-out
causes vibration and premature wear of the rotor and the
motor.
Samples of like (similar) specific gravities may be
processed in the same run, provided that the samples of the
same type are balanced around the rotor, as though they
were the only pairs in the rotor.
Caution:
Do
not
exceed maximum rated speed for each
rotor/accessory combination. Maximum rated speeds can
be found in Section 4.2 -
Speed And Force Tables
.
Rotor Balance
Load tubes in the following manner:
1.
Load two tubes at positions:
9 and 18.
2. Load four tubes at positions:
1, 5 and 10, 14
or
7, 3 and 16, 12
3. Load six tubes at positions:
1, 9, 5 and 14, 18, 10
or
7, 9, 3 and 12, 18, 16
4. Loading an odd number of tubes is not
recommended.
MARATHON Series Operation Manual
16
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