Page 310 - Machinery Component Maintenance

292 Machinery Component Maintenance and Repair

Table 6-4
Standards for Testing Balancing Machines
Application Title Issuer Document no
3eneral industrial Balancing Machines- International DIS 2953
balancing machines Description and Standards 1983
Evaluation Organization *
(IW
let engine rotor Balancing Equipment Society of ARP 587 A
balancing machines for Jet Engine Com- Automotive
(for two-plane ponents, Compressor Engineers,
correction) and Turbine, Rotating Inc. (SAE)
Type, for Measuring
Unbalance in One or
More Than One
Transverse Plane
let engine rotor Balancing Equipment Society of ARP 588 A
balancing machines for Jet Engine Com- Automotive
(for single-planc ponents, Compressor Engineers,
correction) and Turbine, Rotating Inc. (SAE)
Type, for Measuring
Unbalance in One
Transverse Plane
Syroscope rotor Balancing Machine- Defense General FSN 6635-
balancing machines Gyroscope Rotor Supply Center, 450-2208
Richmond, Va. NT
Field balancing Field Balancing Equip- International IS0 2371
equipment ment- Description Standards
and Evaluation Organization
(IS01
* The 1983 version contains important revisions in the test procedure.

Inboard Proving Rotors for Horizontal Machines
For general purpose machines, and in the absence of a proving rotor
supplied by the balancing machine manufacturer, any rigid rotor such as
an armature, roll, flywheel, etc, may be made into a proving rotor. Ide-
ally, its weight and shape should approximate the actual rotors to be bal-
anced. Since these usually vary all over the capacity range of a general
purpose machine, IS0 2953 suggests one rotor to be near the minimum
weight limit, a second rotor near the maximum.
Particularly for soft-bearing machines, it is important to make the U,,,
test with a small rotor since that is where parasitic mass of the vibratory
system (carriages, bridge, springs, etc.) has its maximum effect on the
sensitivity of unbalance indication. As a general rule, it would probably