CNC Machining + AI Dual Quality Control: How We Achieve ±0.05mm Tolerance and 48h Salt Spray on Every Fastener
Have you ever received perfect samples from a supplier, only to find bulk products with oversized dimensions, poor concentricity, or rust? Fasteners may be small, but they directly affect power tool safety and lifespan. Today, we want to openly share our factory’s real inspection standards – from CNC machining to AI full inspection – every step backed by data.
1. Step 1: CNC Precision Machining – Quality Starts at the Source
All our angle grinder flanges, adapter shafts, and wire cup brush nuts are CNC‑machined. Key specs:
- Dimensional tolerance: ±0.05mm (for thread, outer diameter, thickness, concentricity)
- Concentricity: High concentricity ensures smooth grinder operation without wobble
2. Step 2: AI Vision Full Inspection – 100% Coverage
We have fully deployed an AI vision inspection system that scans every piece before packing
- Defects detected: cracks, burrs, dimensional deviation, bad threads, surface scratches, mixed parts
Rejected parts are automatically removed.
3. Three Core Tests – Every Batch Must Pass
In addition to CNC and AI, every batch undergoes three mandatory tests:
| Test Item | What It Checks | Passing Standard |
|---|---|---|
| Pressure Test | Simulates high‑speed grinder stress | No deformation, no fracture |
| Dynamic Balance Test | Measures rotational balance | Vibration below industry standard, smooth grinding |
| 48‑Hour Salt Spray Test | Continuous salt spray environment | No red rust, coating intact |
4. Finished Product Checklist (Every Single Piece)
Our AI system + QC team inspects each piece for:
- Dimensions: Thread go/no‑go gauge, outer diameter caliper, thickness micrometer, concentricity gauge (±0.05mm tolerance)
- Hardness: Rockwell/Brinell hardness sampling – ensures proper heat treatment
- Performance: 48h salt spray test per batch – report provided
- Appearance: AI vision + human verification – no cracks, burrs, or rust
Rejects are scrapped on the spot – never mixed into packing.