SCZY LTD: Transparent Quality Control Instructions for CNC Machined Parts

1. SCZY Guarantee: Transparent Quality Control for CNC Machining

At SCZY, we know your project’s success allows no compromise. The precision, reliability, and integrity of every component we make matter most. That’s why our quality control isn’t just a final step—it’s a core principle guiding everything we do. This page breaks down our end-to-end quality system, the one that lets us stand behind every part leaving our factory. We call it the SCZY Guarantee.

2. Our Quality Philosophy: Prevention Over Detection

Many manufacturers treat quality control as a final check for errors. At SCZY, it’s an active, ongoing process rooted in our culture. We focus on preventing issues, not just finding them. This commitment is backed by our ISO 9001:2015 certification, which frames our quality management system. We promise consistent excellence, robust risk management, and continuous improvement—ensuring your parts meet the highest standards, every time.

3. Step-by-Step Quality Assurance Journey

To put our philosophy into action, we’ve built a strict, multi-stage process. Every project follows this path, keeping quality in check from quote to delivery.

3.1 Pre-Production: Building a Foundation for Success

Quality starts in the design phase. Our pre-production steps clear up ambiguities and optimize your design for perfect execution.

Before cutting metal, our engineers review your CAD models, technical drawings, and specs. We check tolerances, material needs, surface finish notes, and special instructions. This ensures we fully grasp your requirements.

We act as an extension of your team, offering proactive DFM insights. Our experts spot potential issues that could raise costs, delay delivery, or hurt quality. This collaboration refines your design for better efficiency and reliability.

We source materials only from trusted, audited suppliers. Each batch comes with certificates. We verify them in-house—using tools like PMI (Positive Material Identification) when needed—to ensure they match your specs.

3.2 In-Process Control: Quality at Every Turn

Once production starts, we maintain strict oversight to keep parts on spec.

For new production runs, the first part off the machine gets a full FAI. Our quality team uses advanced tools to check every dimension against your drawings. Production begins only after FAI approval, confirming machine settings and CAM programs are correct.

For high-volume orders, we use SPC to monitor process stability. Real-time data analysis flags small deviations early, so we fix issues before they cause defects. This keeps consistency high across the entire batch.

Our CNC operators are trained to act as first-line inspectors. They use calibrated tools to check key dimensions regularly during machining. This instant feedback lets them adjust on the spot, keeping quality steady.

3.3 Post-Production: Final Verification

After machining, every part undergoes a strict final check.

Our FQC team tailors inspections to part criticality and your needs. This includes AQL-based sampling for large batches and 100% checks for key functional dimensions.

Our temperature-controlled lab uses precision equipment:

These tools ensure measurements are accurate, even for tight tolerances.

Transparency matters. We provide detailed reports with measured vs. spec data, including CMM results. These documents prove your parts meet all requirements.

3.4 Shipping: Protecting Quality to Your Door

Our quality promise doesn’t end with inspection. We ensure parts arrive in perfect condition.

All parts are thoroughly cleaned. Burrs are removed to ensure they’re ready for assembly on arrival.

We design packaging for your parts’ shape, weight, and surface treatment—using foam liners, ESD bags, or rigid crates to prevent damage in transit.

Before shipping, we verify all required docs are included: material certs, inspection reports, and certificates of conformity.

4. Precision Inspection Equipment

Our quality lab has state-of-the-art tools, all calibrated regularly:

Automates high-precision 3D measurements for complex geometries and GD&T, beyond manual tools’ capability.

Non-contact optical tools ideal for small features, threads, and contours—with high magnification for 2D checks.

Calibrated calipers, micrometers, and height gauges for fast, accurate in-shop measurements.

Quantifies Ra/Rz values to ensure surface finish meets your specs for texture and performance.

Verifies material strength with Rockwell/Vickers readings, confirming mechanical properties.

Go/no-go gauges quickly check standard thread pitches and hole diameters.

5. Documentation & Traceability

We track every part from raw material to delivery, with a document package including:

5.1 What You’ll Receive

6. Our Quality Team: Experts You Can Trust

Our team includes ASQ-certified inspectors and engineers with deep experience in aerospace, medical, and automotive quality standards. They train regularly on new tools and standards, ensuring rigorous checks at every step.

7. FAQs About Our Quality Process

Standard tolerances follow ISO 2768-m (medium). For tighter needs, we can hit ±0.005mm (±0.0002 inches) depending on part geometry and material.

Yes. Our engineers are GD&T experts, and our CMMs accurately verify true position, profile, and other geometric controls.

Every material batch gets a unique ID, tracked through production, inspection, and shipping. This links finished parts to their original material batch.

8. Experience Our Quality Process

Understanding our commitment is one thing—experiencing it is another. Send us your design, and we’ll show you how our strict quality checks deliver precision and reliability for your project.