Meaning
Industrial metrology standards define safety buffers to adjust acceptance limits based on measurement uncertainty. Practicing guardbanding iso 14253 1 reduces the risk of accepting non-conforming parts by shifting the specification limits inward. This procedure ensures that products labeled as conforming are highly likely to meet all requirements.
Its use is limited to situations where measurement uncertainty is too large to ignore and must be rigorously accounted for.
Acceptance Limit
Tolerance specifications must be adjusted downward to account for the performance of the inspection tools. Under guardbanding iso 14253 1, the new acceptance zone is the specification zone minus the expanded uncertainty. This calculation prevents the shipment of borderline defective units.
Measurement Offset
Calibration data must guide the placement of the guard band to maintain product safety. An incorrectly calculated offset under guardbanding iso 14253 1 can lead to the false rejection of good parts. Quality managers must balance the cost of false rejections against the risk of bad shipments.
Yield Reduction
The economic cost of implementing strict safety zones is a drop in the volume of approved products. A company that sets too wide a guard band will reject many usable parts during production. This reduction in yield can be managed by using more precise measurement instruments.
