From 808e3e34b836500c03250fc62213a1a7ef114e28 Mon Sep 17 00:00:00 2001 From: grabowski Date: Fri, 17 Jul 2026 13:56:45 +0700 Subject: [PATCH] Add quality automation spec: stamper metrology and layered record QC - Keyence-class instrument stack for father/mother/stamper analysis (VK-X confocal sampled zones, VR-6000 wide-area, XRF thickness) with genealogy integration via middleware - Three-layer pressed-record QC: 100% inline optical inspection, per-cycle press telemetry, sampled automated audio comparison - Honest limits documented: no turnkey products exist for the optical and audio layers; 100% audio QC impossible at press speed --- README.md | 5 ++ docs/quality-automation.md | 130 +++++++++++++++++++++++++++++++++++++ docs/traceability.md | 3 +- 3 files changed, 137 insertions(+), 1 deletion(-) create mode 100644 docs/quality-automation.md diff --git a/README.md b/README.md index 9f912b2..490672c 100644 --- a/README.md +++ b/README.md @@ -74,6 +74,10 @@ The detail lives in dedicated documents: - [Process logging and traceability](docs/traceability.md): end-to-end per-order traceability for customers, batch genealogy from audio file to shipment, and the requirements this sets for the factory software +- [Quality automation](docs/quality-automation.md): stamper metrology + (Keyence-class confocal, profiler, XRF), layered pressed-record QC (100% + optical inspection, per-cycle press telemetry, sampled automated audio + comparison), and how it feeds traceability ## Repository Layout @@ -87,6 +91,7 @@ docs/ ├── finance/ Project cost overviews ├── suppliers/ Supplier contacts, vendor landscape, supplier map ├── facility-security.md Security, HVAC, fire and life safety, compliance +├── quality-automation.md Stamper metrology and layered record QC ├── sustainability.md Energy, water, materials commitments ├── traceability.md Process logging and per-order traceability └── worker-safety.md Training, clean rooms, PPE diff --git a/docs/quality-automation.md b/docs/quality-automation.md new file mode 100644 index 0000000..011250d --- /dev/null +++ b/docs/quality-automation.md @@ -0,0 +1,130 @@ +# Quality Automation + +The target is to automate as much as possible. For quality control this +means instruments and inspection stations that measure, decide, and log into +the [traceability system](traceability.md) without manual transcription. +Research findings from vendor sites and trade sources, July 2026; the +recommended architectures are engineering positions to be validated with +vendors, not purchased designs. + +## Stamper, father, and mother metrology + +What must be measured on the electroformed nickel parts (~0.2 to 0.3 mm +thick): groove geometry (grooves are 40 to 80 microns wide, ~28 microns +deep, 200 to 350 grooves per inch, inverted to ridges on a stamper), +thickness uniformity (total thickness variation of 10 to 20 microns is the +achievable target, by analogy with CD stamper practice), surface roughness +on the groove walls, and micro-defects. + +A Keyence-class instrument stack covers this, in tiers: + +- **Keyence VK-X 3D laser confocal microscope**: 20 nm vertical and ~120 nm + lateral resolution, non-contact. The reference-grade instrument for groove + cross-sections, wall roughness, and fine defect analysis. Scanning the + full spiral (hundreds of meters of groove or more) is not feasible; the + correct strategy is **sampled radial zones** (lead-in, outer, mid, inner + radius). The optical disc industry verified its nickel stampers with the + same instrument class, so the technique transfers directly. +- **Keyence VR-6000 wide-area profiler**: 0.1 micron height resolution, + ~1 second per field, with an HDR mode built for glossy surfaces (bright + nickel is near-mirror, the classic hard case for optics; manageable, but + plan tuning time). Fast wide-area form, flatness, and gross defect + mapping. +- **XRF thickness gauge** (Fischer/Bowman class): non-destructive nickel + deposit thickness per serial, replacing the industry's manual 10-point + micrometer practice. Thickness must be read on the outer land/shoulder + zones, not across the groove field. +- **Stylus profilometer** kept as the traceable calibration reference. +- **Inline machine vision** for fast 100% cosmetic screening of every part. + +Integration is real but not turnkey: the Keyence instruments export CSV and +raw 3D data and support scripting/REST layers, and the inline sensors speak +Ethernet/IP, but there is no off-the-shelf MES connector. Budget a light +middleware service that stamps each measurement with the part serial and +batch ID and writes to the genealogy database. + +Industry context: even a respected stamper house checks thickness with a +hand micrometer at 10 points on sacrificial blanks, with nothing logged. +Automated non-contact metrology with per-serial logging is ahead of current +industry practice, which is exactly the point: it makes every father, mother, +and stamper a data-backed accept/reject decision before the next plating +generation or press mounting. + +## Pressed record QC: three layers + +Full automated audio checking of every record is physically impossible: a +12" record plays for ~40 minutes both sides while a press makes a new record +every ~25 seconds, so one press outruns roughly 80 to 95 full-time listening +stations. No commercial playback-QC robot exists anywhere. The credible +maximum-automation architecture is layered: + +### Layer 1: 100% optical inspection, inline + +Machine vision can inspect every record at line speed. Detectable with +darkfield lighting and line-scan cameras: non-fill (dull patches where PVC +did not fill the stamper), stitching and flow lines, warp (via structured +light or profilometry), off-center spindle holes (concentricity of hole vs +groove spiral), surface debris, and label errors (wrong label, off-center, +print defects). Non-fill and stitching correlate with audible defects, so +optical inspection is a strong proxy for audio quality without playing the +record. + +No vinyl-specific vision product exists; this is a custom integration of +general machine vision (Keyence or Cognex class) at the press unloader. CNX +would be an early adopter, and it should be budgeted as an integration +project. + +### Layer 2: press telemetry, every cycle + +The proven, deployed piece. Viryl's ADAPT platform demonstrates the model: +per-cycle nozzle pressure, mold temperatures, cycle time, cake weight, +yields, and drift alerts streamed from the press. The Pheenix AD12 runs a +Beckhoff PLC exposing similar data over standard industrial protocols, and +supports remote monitoring. Machine data access is already flagged as a +procurement requirement in the traceability spec. + +### Layer 3: automated audio comparison, sampled + +A needle-drop capture station with automated analysis, run on samples: +every test pressing / first-off per stamper, plus pulled samples scaled by +stamper age (stampers last roughly 1,000 to 2,000 records; sampling should +densify near end of life; industry rule of thumb is a spot-play around every +50th record). + +The analysis pipeline is buildable from proven parts but is a first-of-kind +system as a whole: + +1. Capture the needle-drop (a conventional tonearm; laser pickups exist but + are dust-sensitive and impractical as line instruments) +2. Spectral-envelope comparison against the source master (the approach + proven by Stamper Discs' Fonograph tool, which avoids the hard + time-alignment problem by comparing whole-program FFT fingerprints) +3. Click/pop detection and counting (mature algorithms of the iZotope RX + class, scriptable) +4. Noise floor from lead-in/run-out silence, channel balance from program + RMS +5. Numeric scores and pass/fail to the traceability database + +What only this layer can catch: wrong master cut into good-looking grooves, +EQ/mastering errors, and speed/pitch problems. Optical and audio layers are +complements, not substitutes. + +## The traceability payoff + +The natural record identity is **stamper ID + press ID + cycle timestamp + +side**. Against that key: press telemetry on every cycle, an optical result +on every record, an audio score on every sampled record, and the stamper's +own metrology history from before it was mounted. Audio scores trending down +against a stamper's play count become an automatic retirement signal, and a +customer complaint about one record resolves to a specific stamper, press, +shift, and compound lot. + +## Honest limits + +- No vendor sells a turnkey version of layers 1 or 3, or the metrology + middleware; all three are integration/development projects +- 100% audio QC of every record is not achievable at press speed and should + never be promised to customers; 100% optical plus sampled audio is the + accurate claim +- Human listening stays in the loop for test-pressing approval; the + automation makes sampling systematic and logged, it does not replace ears diff --git a/docs/traceability.md b/docs/traceability.md index d193bc0..898c040 100644 --- a/docs/traceability.md +++ b/docs/traceability.md @@ -21,7 +21,8 @@ For any order, the customer can follow the full chain: parameters (temperatures, pressures, cycle times), PVC compound lot and virgin/recycled mix, label lot 6. **Quality control**: test pressing approvals, inspection results, reject - counts and reasons + counts and reasons (the automated instrument layers feeding this are + specified in [quality automation](quality-automation.md)) 7. **Finishing and packaging**: trimming, sleeving, carton lot, packaging partner batch 8. **Fulfillment**: warehouse location, shipment or dropshipping consignment,