
294 Quality Assurance
Both types of OEE depend on the following three calculations:
Availability: Includes operating pattern, downtime, and allocation
percentage. The actual formula is
=
Operating time
( )
Net available time
( )
Performance efciency: Rate at which parts are produced compared to
ideal rate. The actual formula is
=
×
Net ideal cycle time
( )
Operating time
( )
Quality rate: Comparison of good parts to all parts produced. The
actual formula is
=
n
Total defects
( )
Total parts run
( )
The relationship between these three components produces the mini-
mum level of efciency ...