Page 274 - Improving Machinery Reliability

Maintenance and Benchmarking Reliability 245

TOP-DOWN GOALS DEVELOPMENT
ENTERPRISE
Critical business issues

MAINTENANCE OPERATIONS

Operational level Goals/metric Critical business issues

Figure 4-2. A top-down approach ensures that operational level goals and metrics
relate to tactical and strategic goals and metrics.

Measurement Attributes
To be efficient and effective, metrics must have the following attributes. Measure-
ments must be:
Appropriate. They must accurately measure the specific operational aspect that
requires measurement.
0 Acceptable. They must be considered, by all concerned, to measure the desired
operational aspect.
Simple. They must be easy to understand, easy to gather, and easy to interpret.
Unambiguous. Metric results must communicate a clear message relating to the
operation being measured.
0 Comparable. Metric data must be capable of being analyzed in relationship to pre-
viously gathered internal and external data.
Strategic Level Maintenance Measures

The following strategic level metrics are suggested as a common set of mainte-
nance measurements:

Maintenance costs as a percent of cost of goods sold (or total production costs)
* Maintenance costs as a percent of machinery and equipment replacement value
Number of service maintenance employees as a percent of direct labor employees
Spare parts inventory as a percent of machinery and equipment replacement value
a Spare parts inventory turns
a Percent of routine scheduled maintenance hours