Page 285 - Machinery Component Maintenance

Balancing of Machinery Components 267

Figure 6-21. A permanently calibrated hard-bearing balancing machine, showing five rotor
dimensions used in computing unbalance.

Maintenance and Production Balancing Machines

Balancing machines may also be categorized by their application in the
following three groups:

1. Universal balancing machines.
2. Semi-automatic balancing machines.
3. Full automatic balancing machines with automatic transfer of work.

Each of these is available in both the nonrotating and rotating types, the
latter for correction in either one or two planes.

Universal Balancing Machines
Universal balancing machines are adaptable for balancing a consider-
able variety of sizes and types of rotors. These machines commonly have
a capacity for balancing rotors whose weight varies as much as 100 to 1
from maximum to minimum. The elements of these machines are adapted
easily to new sizes and types of rotors. Amount and location of unbalance
are observed on suitable instrumentation by the machine operator as the