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APR can provide you with dynamically balanced impellers and rotating elements, from our in-house balance area, up to 5,000 lbs x 63” diameter. APR provides G-2.5 as a standard dynamic balance, unless otherwise noted.
Balance is when the distributed mass weight of an object is on the axis of rotation of a rotating element.
Unbalance is when the weight of the mass is not on the axis of rotation, and vibration occurs. Unbalanced vibrations may cause damage to bearings, shafts, mechanical seals, and drive motor failures.
Balancing involves either the addition or removal of material weight or mass until the distributed mass weight is on the axis of rotation when the assembly or component is rotated. This weight can be added by gluing, welding, bolting it on, and removed by drilling, grinding, unbolting, or machining.
Balance is broken down into categories in accordance with ISO in steps of 2.5, ranging from Grade G-6.3 at its least accurate, for such things as rubber covered idler rollers, up a maximum of G-0.4 for high precision grinding machines. Normally industry only uses 4 grades with highest being G-0.4, then G-1.0, G-2.5 and G-6.3.
