GD&T & Tolerance Optimization
📐 CMM‑Ready Drawings + Datum Strategy
📊 SPC / Cpk for CTQs 📑 PPAP / FAI Deliverables
Datum & Feature Control
Tolerance Stack-ups
Inspection & SPC Planning
Why GD&T Matters
Datum Strategy & Feature Control
Define functional datums, primary/secondary/tertiary schemes and datum targets that reflect assembly methods and tooling references.
Tolerance Stack‑Ups & Gap Analysis
Statistical and worst‑case stack‑ups for mating features; identification of CTQs and sensitivity analysis for cost vs risk tradeoffs.
Inspection Planning & CMM Ready Outputs
CMM callouts, fixture gauges, sampling plans, GR&R considerations and SPC charting for critical characteristics.
From Tolerance Review To Production
Intake & Context
We capture assembly intent, mating features, tolerance drivers and functional requirements from drawings and CAD, including target volumes and allowable rework cost.
Datum & Stack‑Up Proposal
We propose a datum scheme and tolerance stack‑up aligned to assembly, tooling references and measurement strategy for the mating features.
Statistical Analysis
Run statistical and worst‑case analyses to determine feasible tolerances, sensitivity to CTQs and the cost impacts of tightening.
Inspection Plan
Create CMM plans, gauging concepts and sampling strategy; propose SPC/Cpk targets for CTQs to support production control.
Handover & Monitoring
Deliver drawings, inspection plan and SPC templates; support first article builds, GR&R and initial production monitoring to refine control limits.
Deliverables You Receive
GD&T Drawing Release
Datum scheme, feature controls, callouts and revision notes ready for supplier release
Tolerance Stack‑Up Report
Functional stack calculations, sensitivity analysis and recommended tolerance relaxations where possible
Inspection & SPC Pack
CMM callouts, sampling plan, SPC/Cpk targets and GR&R recommendations
How We Reduce Cost Without Risk
We identify non‑functional features that can be relaxed, propose consolidated datums to reduce measurement time, and balance tolerance tightening only where function requires it saving machining, inspection and scrap cost.
Typical Impact
Reduced inspection time, fewer ECO cycles, lower scrap and improved supplier throughput once control plans are established.
Tolerance Guidelines (Quick Reference)
General Dimension Tolerance
Flatness & Surface Controls
Geometric Tolerances
Supported File Types & Examples
| Item | Examples |
|---|---|
| CAD | SolidWorks, Creo, Inventor; STEP/IGES translations verified |
| Metrology | CMM routines, 3D scan exports, custom gauge drawings |
| SPC | Excel/CSV templates, Minitab-ready outputs |
