Secondary Operations & Finishing
A. Value-Added Services
Operation | Equipment/Process | Capability | Typical Tolerances |
CNC Turning | Live tooling on mills, separate lathes | Turning features on milled parts | ±0.01mm |
Grinding | Surface, cylindrical, jig grinders | Precision flatness, parallelism, size | ±0.002mm |
EDM | Wire and sinker EDM | Complex geometries, hard materials | ±0.005mm |
Heat Treatment | Vacuum furnaces, atmosphere controlled | Hardening, tempering, stress relief | Material dependent |
Welding | TIG, laser, electron beam | Component assembly, repair | ±0.05mm after weld |
Assembly | Press fits, adhesive, fastening | Multi-component assemblies | As per drawing |
B. Surface Finishing Options
Finish Type | Process Method | Surface Ra (μm) | Characteristics & Applications |
As-Machined | Standard CNC milling | 0.8-3.2 | Cost-effective, visible tool marks, general applications |
Bead Blasting | Glass bead, aluminum oxide | 0.8-1.6 | Matte finish, uniform appearance, stress relief |
Polishing | Mechanical, chemical, electro | 0.025-0.4 | Reflective, smooth, food, medical, optical |
Anodizing | Type I-III, hardcoat (Al) | Base material dependent | Decorative, corrosion resistant, wear resistant |
Plating | Nickel, chrome, zinc, tin | Varies | Corrosion protection, appearance, solderability |
Powder Coating | Electrostatic application | N/A (coating) | Durable, color options, corrosion protection |
Passivation | Nitric or citric acid (SS) | Base material finish | Corrosion resistance restoration |
Laser Marking | Fiber, YAG lasers | N/A (marking) | Permanent identification, serialization, logos |
Tumbling/Vibratory | Media finishing | 0.4-1.6 | Deburring, edge breaking, surface smoothing |
Quality Assurance & Inspection
A. Inspection Equipment & Capabilities
CMM (Coordinate Measuring Machines): 3D measurement with 0.001mm accuracy, temperature controlled
Optical Comparators/Vision Systems: Non-contact measurement, 2D profile verification
Surface Roughness Testers: Contact and non-contact Ra, Rz, Rq measurements
Roundness/Form Testers: Cylindricity, concentricity, flatness verification
Hardness Testers: Rockwell, Brinell, Vickers, micro-hardness
Portable Arms: Articulated arms with laser scanner for large parts
Digital Height Gauges: Precision height measurement with 0.001mm resolution
Gauge Blocks & Calibrated Instruments: Full set to ISO 3650 standards
Force/Torque Measurement: For assembly validation, spring constant verification
B. Quality Management System
ISO 9001:2015 Certified: Full quality management system implementation
First Article Inspection: AS9102, PPAP, or custom FAIR documentation
Statistical Process Control: Real-time monitoring of critical characteristics
Material Certification: Mill test reports, material traceability to heat/lot
Calibration Program: All inspection equipment calibrated to NIST-traceable standards
Document Control: Revision-controlled drawings, specifications, procedures
Non-Conformance System: Documented containment, root cause analysis, corrective action
