Page 333 - Machinery Component Maintenance

Balancing of Machinery Components 31 5

0 Direct indication of unbalance in drill depth for selectable drill diam-
eters and materials.
Averaging of ten successive readings for increased accuracy.
0 Automatic storage of readings taken in several runs with subsequent
calculation of the mean reading (used to average the effect of blade
scatter on turbine rotors with loose blades).
0 Readout in any desired components (in certain workpieces, polar
correction at an exact angular location is not possible. Instead, cor-
rection may only be applied at specific intervals, e.g., 30°, 45",
90°, etc. The computer then calculates the exact correction mass to
be applied at two adjacent components for any desired angle between
components).
Optimized distribution of fixed-weight correction masses to available
locations.
Automatic comparison of initial unbalance with maximum permissi-
ble correction. and machine shutdown if the initial unbalance is too
large.
Automatic comparison of residual unbalance with predetermined tol-
erances or with angle-dependent family of tolerances.
Translation of unbalance readings from one plane to another without
requiring a new run (for crankshafts, for instance, where correction
may only be possible at certain angular locations in certain planes).
Permanent record of the balancing operation, including initial and re-
sidual unbalance, rotor identification, etc. (for quality control).
Machine operation as a sorter.
Statistical analysis of unbalance.
Connection to an X-Y plotter for graphic display of unbalance.
Operator identification.
Inspector identification.
Monitoring of the number of runs and correction steps.
Time and/or date record.

Prompting Guides and Printout
Prompting displays on a cathode ray tube (CRT) guide the operator ev-
ery step of the way through the program (Figure 6-40). Rotor data is
stored on a cartridge tape and can be recalled at a later date for balancing
the same type of rotor. Thus ABC, R1 and R2 rotor dimensions need tO
be entered into the computer only once.