Xylem P2000516 Marlow Series Impeller Static Balancing Instructions - Manual (Page 3)

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FIGURE 5
STEP 3 — Place impeller in chunk on drill table. Align
flat mill cutting tool at center of imbalance point on
the impeller wall. If the unbalanced condition is quite
pronounced make the first cut about 1/64" deep and
2" to the left and right of the center point.
FIGURE 6
This is done by moving the handle attached to drill
table back and forth. A continuous balance check
should be made during this operation. The impeller is
properly balanced when it remains stationary on the
balance ways on any point of its 360º periphery.