Drilling is a method to remove mass on the side of the unbalance. VM-BAL calculates angle positions, depth and number of drillings.
 Maximum number of drillings
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Up to 3 equal drillings are allowed to increase the amount of removed material
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 Maximum depth
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 Drill diameter
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 Drill point angle
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 Material density
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The density of the removed rotor material is needed to calculate the removed mass.
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