Managing Shared Assembly Line Priority and Queue Allocation
Managing shared line priorities requires balancing station work content variance and commercial order margins to prevent bottleneck starvation.
Station Starvation
Meaning
Productivity losses happen when a machine or worker remains idle because no raw material or semi finished parts are available for processing. Operational downtime happens when a manufacturing station is ready to work but has no input material. During station starvation, the cycle cannot begin because the preceding process has not delivered the required parts.
Identification of a bottleneck earlier in the production sequence is often the result of this condition.
Idle Accumulation
Worker or machine remains unproductive until the arrival of the next unit. Gaps in the production schedule created here often ripple through all subsequent stages. Measuring the duration of these events helps management identify the slowest part of the total process.
Flow Variation
Inconsistencies in the timing of upstream tasks cause these interruptions. A station with a highly variable cycle time will occasionally fail to produce a part before the downstream station is ready. Standardizing work instructions and reducing movement waste help to stabilize the delivery of material.
Productivity Loss
Total factory output drops in direct proportion to the time lost at the bottleneck station due to lack of supply. Non-bottleneck stations can often absorb some starvation without affecting the final ship date. Identifying which idle periods are critical and which are secondary is a core part of line balancing, which allows for the placement of buffers in the most effective locations.