Measurement System Analysis: Hidden Factory Evaluation
What Comprises the Hidden Factory in a Process/Production Area?
- Reprocessed and Scrap materials — First time out of spec, not reworkable
- Over-processed materials — Run higher than target with higher
than needed utilities or reagents - Over-analyzed materials — High Capability, but multiple in-process
samples are run, improper SPC leading to over-control
What Comprises the Hidden Factory in a Laboratory Setting?
- Incapable Measurement Systems — purchased, but are unusable
due to high repeatability variation and poor discrimination - Repetitive Analysis — Test that runs with repeats to improve known
variation or to unsuccessfully deal with overwhelming sampling issues - Laboratory “Noise” Issues — Lab Tech to Lab Tech Variation, Shift to
Shift Variation, Machine to Machine Variation, Lab to Lab Variation
Hidden factory Linkage –
- Production Environments generally rely upon in-process sampling for adjustment
- As Processes attain Six Sigma performance they begin to rely less on sampling…
View original post 270 more words