Earl M. Halfen is president of The Balancing Systems Group, Inc., 1706 Sabine Lane, Richmond, TX 77469, 281-762-5703, Fax: 281-762-5706.
Lessening the Impact of Eccentricity
- Apply a reasonable balance tolerance if fit-up problems will exist.
- If possible, in the case of precision balancing, use the actual bearings that will support the shaft and operate the rotor in "V" blocks instead of roller bearings.
- Always attempt to operate the piece in the balancing machine at the same centerline it will assume in its own bearings. Never move off the journal to a seal area to balance.
- If a tight tolerance such as API or ISO G 1.0 is demanded, then demand in return the ability to balance the part with all of its rotating components, such as coupling hubs, belt sheaves, etc.
- If a part is to be disassembled and then reassembled in place, consider testing to see what the average reassembly level is, then balance to that level.