Downtime
Periods when equipment or production lines are not operating, whether due to breakdowns, changeovers, maintenance, or lack of materials. Downtime directly impacts productivity and OEE, making its reduction a primary focus of maintenance and operations improvement efforts.
RELATED TERMS
Overall Equipment Effectiveness
A metric that measures manufacturing productivity by multiplying three factors: Availability (uptime), Performance (speed), and Quality (good units produced). An OEE score of 85% is considered world-class, while most manufacturers operate between 60-70%. OEE identifies losses and improvement opportunities in equipment utilization.
Mean Time to Repair
The average time required to diagnose and fix a failed piece of equipment and return it to operational status. MTTR is a key maintenance metric that helps organizations evaluate maintenance team effectiveness and plan for equipment downtime in production schedules.
Mean Time Between Failures
The predicted average time between equipment breakdowns during normal operation. MTBF is used to assess equipment reliability, plan preventive maintenance schedules, and make decisions about equipment replacement or upgrades.
Changeover Time
The time required to switch a machine or production line from making one product to another, including setup, adjustment, and first-article inspection. Reducing changeover time through techniques like SMED (Single-Minute Exchange of Dies) enables more flexible production and smaller batch sizes.