Meaning
Production methodology that systematically lowers inter-station work in process inventory across an assembly line forces hidden operational friction to surface at active work centres. Operating with reduced safety margins makes minor cycle time deviations immediately visible before schedule losses accumulate. Executing buffer hunting allows plant managers to isolate true bottleneck operations from artificial dampening created by excess queuing.
The practice ceases to apply when inventory levels drop to zero or when stations experience complete starvation caused by unmanaged supply failure.
Capacity Volatility
Fluctuations in line throughput emerge rapidly when protective stock between cells is intentionally reduced. Removing excess holding capacity prevents downstream operations from absorbing minor machine outages or operator delays. Production teams measuring line performance during buffer hunting record immediate changes in cell utilization rates.
Capability metrics derived from unbuffered runs reveal the actual stability of each workstation under continuous load. Unmasking these variations stops engineers from mistaking high WIP cushion for stable cell design.
Reduction Sequence
Lowering intermediate stock requires a controlled schedule of incremental inventory removals matched to station capability. Process engineers reduce queue limits by fixed percentages during scheduled production shifts while monitoring line balance metrics. When buffer hunting exposes a hidden bottleneck, inventory levels are stabilized temporarily until technical interventions resolve the micro-stoppage.
This structured reduction continues across all intermediate stages until line flow matches target takt time. Moving from pilot lines to high-volume manufacturing without this validation risks carrying hidden cycle losses into full production.
Operational Risk
Premature removal of safety stock without real-time line monitoring causes severe line starvation and lost output. Line stoppage costs compound quickly when downstream stations sit idle while upstream failures undergo repair. Factory managers evaluating buffer hunting balance the financial benefit of reduced working capital against the immediate penalty of lost shift volume.
The intervention halts when total downtime cost exceeds the holding cost of intermediate inventory.
