How do you find the bottleneck on a production line?
The bottleneck is the step that limits the output of the whole line. Find it by looking for where work in progress piles up in front of a machine, which machine is rarely starved or blocked, and which step has the lowest effective capacity for the current product mix. Confirm it with data: when the bottleneck stops, line output stops.
Talk to an engineer about thisThree signs that point to the bottleneck
Queues: work in progress accumulates in front of the constraint. Utilization: the constraint is almost always running, rarely starved (waiting for input) or blocked (unable to pass work on). Response: when the constraint stops, finished output drops at once; when another machine stops, buffers absorb it for a while.
Measure effective capacity, not nameplate speed
Compare each step on units per hour it actually achieves, after its own downtime, changeovers and scrap, for the current product mix. The step with the lowest effective capacity relative to demand is the constraint. It can move when the product mix changes, so check it for the main product families.
Use machine data to confirm
With machine monitoring on each step, starved and blocked time can be measured directly. The machine with the least starved and blocked time, and the most running time, is usually the bottleneck. Downtime on that machine, ranked by cause, is the most valuable improvement list in the plant.
What to do once you find it
Protect it: never let it wait for material, operators or inspection; move breaks and changeovers so it keeps running; place quality checks before it so it does not process bad parts. Then increase its capacity: reduce its changeovers and short stops before buying equipment. When it is no longer the constraint, find the next one.
Related questions
Ajinkya Technologies builds MES, OEE, IIoT, traceability and RFID systems for manufacturers in India and the US from Belagavi and Bengaluru. Questions: bdo@ajinkyatechnologies.in.
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Reviewed by Amey Kadle, Founder, Ajinkya Technologies. Last reviewed: .