---
id: "knowledge-quality-management-en"
title: "Quality Management"
description: "Practical guidance on CTQ, tolerance stack-up, GD&T, leak testing, inspection, SPC, and production control."
source: "/en/knowledge/quality-management"
language: "en"
generated: true
---

# Quality Management

Practical guidance on CTQ, tolerance stack-up, GD&T, leak testing, inspection, SPC, and production control.

Practical technical resources for product design, drawing review, manufacturing decisions, quality validation, and production launch.

## All articles

### [From Prototype to Production: CTQ, Tolerance Stack-Up and Process Control for Humanoid Robot Parts](/en/resources/humanoid-robot-parts-prototype-to-production)

How precision humanoid robot parts move from prototypes to stable production: define CTQs, build functional tolerance stack-ups, validate the production process and measurement system, then control capability, traceability and change.

### [Joint Actuator Precision Parts and Machining CTQs: Controlling the Rotation Axis, Bearing Fits, Output Flange and Encoder Datum Chain](/en/resources/joint-actuator-precision-parts-machining-ctq)

A function-driven guide to the critical dimensional relationships among the housing, reducer locating seat, bearing bores, output flange, encoder interface and motor end cap, including datum strategy, machining sequence, inspection and production control.

### [AI Server Cold Plate Leakage Causes, Leak Testing and Quality Control](/en/resources/ai-server-cold-plate-leak-testing-quality-control)

A manufacturing-focused guide to real leaks, false test signals, joining defects, port sealing, pressure-decay testing, tracer-gas methods and production traceability for AI server cold plates.

### [Cold Plate Sealing, Flatness, Leak and Pressure Testing Guide](/en/resources/cold-plate-sealing-flatness-leak-pressure-testing)

A practical engineering guide to sealing geometry, free-state and assembled flatness, pneumatic leak testing, proof pressure, post-pressure verification, and production test-system control.

### [How to Control Cold Plate Internal Cleanliness: Particles, Oils, Cleaning, Drying and Packaging](/en/resources/cold-plate-internal-cleanliness-cleaning-drying-packaging)

A manufacturing guide to particles, chips, machining oil, cleaning residues, retained moisture, flushing validation and transport protection for AI server cold plates.

### [From Prototype to Production: CTQs, Tolerance Chains and Batch Control for Optical Transceiver Precision Parts](/en/resources/optical-transceiver-ctq-production-control)

A practical guide to moving optical transceiver thermal lids, precision bases, heat spreaders and locating housings from prototype validation into repeatable production through CTQ definition, functional tolerance chains, measurement-system validation, capability studies, SPC, traceability and change control.

### [Optical Transceiver Thermal Interfaces: Flatness, Roughness, TIM and Contact Resistance](/en/resources/optical-transceiver-thermal-interface-control)

A practical guide to controlling flatness, surface roughness, TIM bond-line thickness, mounting load, finishing and thermal contact resistance between optical transceiver lids, heat spreaders and riding heatsinks.