Quality is the core principle that Dao Siang consistently upholds, and it is our long-term commitment to every customer.
We believe that superior quality is achieved not only through final inspection, but also through design, manufacturing, management, and a company-wide quality mindset. From product development, incoming material inspection, and in-process control to final inspection and shipment verification, Dao Siang has established a complete and systematic quality management process to ensure every product meets customer requirements for precision, stability, and reliability.
Through our ISO 9001 quality management system, precision measuring equipment, SPC, MSA, GR&R, and digital quality management, Dao Siang continuously enhances quality consistency and process capability, providing customers with reliable precision manufacturing services.
Quality Management Principles
1. Customer Focus: Customer needs and expectations are the core of quality management.
2. Leadership: Management establishes clear direction and quality objectives.
3. Engagement of People: Quality is achieved through the participation of every employee.
4. Process Approach: Standardized processes ensure consistent quality.
5. Continuous Improvement: Processes and management systems are continuously reviewed and improved.
6. Evidence-Based Decision Making: Decisions are made based on data and inspection results.
7. Relationship Management: Strong partnerships are built with customers, suppliers, and teams.
Why Customers Choose Dao Siang’s Quality Assurance?
Six Key Advantages
1. Comprehensive quality control from design to delivery
2. Strict inspection through IQC, IPQC, FQC, and OQC
3. Complete traceability of production records and inspection data
4. Precision measurement capability up to 0.001 mm
5. Quality documentation including APQP, PPAP, SPC, and MSA
6. A culture of continuous improvement and company-wide participation
Quality Control Process
Dao Siang has established a complete quality control process covering every stage from incoming materials to final shipment. Each step is managed according to customer requirements, inspection standards, and acceptance criteria to ensure that every product meets the required quality standards.
At the early stage of product development, DAO SIANG supports customers through drawing reviews, process planning, and risk assessment to optimize product designs and enhance manufacturability. By evaluating material selection, tolerances, machining methods, and production costs, potential issues can be identified in advance, reducing development risks and manufacturing costs while ensuring a smooth transition into mass production.
• Design for Manufacturability (DFM) Review
• Critical Dimensions and Tolerance Evaluation
• Machining Process and Manufacturing Planning
• Material Selection and Machinability Analysis
• Cost Optimization and Mass Production Feasibility Assessment
• Quality and Process Risk Analysis
• Inspection Method and Measurement Planning
Incoming inspections are performed on raw materials, purchased components, and outsourced processes. Inspections are carried out according to incoming inspection standards, sampling plans, and acceptance criteria to prevent defective items from entering production.
• Verification of raw material dimensions and material specifications
• Inspection of surface treatment and outsourced process quality
• Review of material certificates and inspection reports
• AQL sampling and acceptance decision
During manufacturing, quality control is carried out through first article inspection, patrol inspection, tool change verification, and final piece inspection. SPC is also applied to monitor process capability and ensure stable mass production.
• First Article Inspection (FAI)
• Patrol inspection and tool change verification
• SPC (Statistical Process Control)
• Process capability analysis and corrective action for abnormalities
Final products are inspected for dimensions, appearance, function, cleanliness, and any customer-specific requirements to ensure full compliance with drawings and specifications.
• Dimensional and appearance inspection
• Function and assembly verification
• Cleanliness and pre-packaging inspection
• Verification of customer-specific requirements
Before shipment, products, documents, and packaging are rechecked to ensure they meet customer requirements, and a complete shipment inspection report is provided.
• Final sampling inspection before shipment
• Verification of packaging, labeling, and quantity
• Provision of inspection reports and traceability records
• Ensuring zero-defect shipment
Quality Systems & Digital Management
Dao Siang integrates precision measuring equipment with digital quality management tools to ensure accurate measurement data, stable processes, and complete traceability.
Management Tools
• SPC (Statistical Process Control)
Monitors process trends and variation in real time to reduce defects.
• MSA (Measurement System Analysis)
Ensures the reliability of measuring equipment and measurement methods.
• GR&R (Gauge Repeatability & Reproducibility)
Evaluates the consistency and stability of measurement equipment and operators.
• APQP / PPAP Documentation
Provides customers with complete quality documentation for product development and mass production.
Precision Inspection Capability
Dao Siang utilizes advanced high-precision inspection equipment from Taiwan and overseas, with measurement accuracy up to 0.001 mm to meet the quality requirements of precision components.
Dimensional Measurement
• Appearance and Surface Roughness Inspection
• Thread, Ring Gauge, and Plug Gauge Measurement
• Height Gauge, Optical Comparator, and Vision Measurement
• Roundness and Profile Measurement
• Coordinate Measuring Machine (CMM) Inspection
• Hardness Testing
Contact Us
Looking for a trusted partner in metal machining? DAO SAING Industrial Co., Ltd. is here to support your needs.
Contact us to learn more about our manufacturing capabilities and how we can add value to your next project.