6-Tips Quality Inspection and Control Methods

CNC machining has many benefits, so manufacturers choose it. Although CNC machining is more efficient and error-free than traditional machining, quality inspection is still indispensable. Quality control and inspection are carried out at all stages of processing. In addition, quality assurance is also important, which is the quality inspection process set by organizations and authorized agencies, including related documents. Quality control is important in all industries, whether it is products, parts, processes, tools, or machines. To meet customer expectations, trade standards, and industry regulations, Kachi uses a variety of measuring tools and instruments to control the quality of CNC machined parts produced in our machine shop.

This article discusses the importance of 6-point quality inspection as well as CNC machining methods and quality control methods.


CNC machining companies play a vital role in contract manufacturing and rapid prototyping services. The success of these operations depends on maintaining extremely precise tolerances, often at a microscopic level. To illustrate this, consider a fuel line valve whose size must be within 1 mm of the specified size. Any deviation from this requirement could result in oil leaks in thousands of vehicles. Similar unintended consequences could occur in industries such as aerospace, shipbuilding, and appliance manufacturing. Therefore, it is crucial to implement effective quality control measures.


Ensuring that the equipment is capable of producing the desired product or prototype is the first step in quality control. CNC equipment includes a variety of machines, including grinders, milling machines, and milling machines. When purchasing equipment, it is recommended to choose a reputable dealer. If you choose to purchase used equipment through purchase or lease, you must apply for a warranty.


Frequent calibration and compliance with maintenance protocols are among the most critical practices for maintaining high-quality standards. Machines can lose calibration due to vibration, shock, and other events on the factory overlook floor. Unfortunately, there are many maintenance protocols for spindles on CNC equipment. However, incorporating them into a comprehensive maintenance plan can yield significant benefits by reducing downtime.


The role of manual inspection is gradually being replaced or supplemented by technological advances. Manufacturers can use their quality control (QC) personnel to conduct inspections or invite testers to their factories for inspections.Record keeping is another effective strategy for CNC shops to improve quality. By recording inspection results and presenting them in graphs or tables, QC personnel can easily access data from every CNC machine on the factory floor. This allows them to monitor common and unusual issues.


The quality of CNC machining ultimately depends on the expertise of the operator. However, there are currently skills gaps in the workforce, including a shortage of CNC operators. One solution to this gap is for manufacturers to form partnerships with local higher education institutions and provide apprenticeship opportunities for aspiring CNC operators.


ISO certification, such as ISO 9000, is a valuable asset for CNC machining companies. Obtaining and maintaining ISO certification can improve business processes, reduce scrap and rework, and reduce costs. Additionally, ISO certification is a powerful tool for sales and marketing staff. Some ISO-certified manufacturers even require their suppliers to be certified as well.


Why is quality control important?

Quality control is a comprehensive inspection of the product and manufacturing process. In CNC machining, quality control is crucial to ensure that manufactured products meet corporate, industry, and customer standards and requirements. In addition, proper quality control of CNC parts will avoid defective products, minimize risks, ensure dimensional accuracy and quality, save resources, reduce costs, and improve efficiency. This is a good thing for both manufacturers and customers.


How do you carry out quality control?

Customer communication

Effective customer communication is an essential element in achieving customer satisfaction. Whether during the manufacturing process or after sending samples, timely communication with customers is effective. Buyers and customers have clear requirements for product specifications and functions. When we receive a customer inquiry, we will contact the customer as soon as possible and give a free quotation as soon as possible. If there is a problem, we will adjust the solution immediately. Please inform us in advance if you have any special requirements.


Understand product design

When customers send CAD drawings of final products, engineers need to analyze the design in detail, understand the customer's product specifications and requirements, and check every detail before production. We will use the most cost-effective solution to machine your part, control factors throughout the CNC machining process, and ensure requirements are met.


Products and Service

Monitoring and measurement procedures for all precision machined products are defined in drawings and specifications, production routes, purchasing documents, and inspection and testing procedures.


Verification of purchased product

All purchased products are visually inspected by a receiving inspector. Selected products are also subject to more detailed technical quality control (QC) inspections.


Process inspection

Process inspections take the form of first article inspections and operator inspections to ensure the quality and on-time delivery of completed orders to our customers.


Final Test

CNC finished products undergo final QC inspection. First, the inspector confirms that all specified inspections and in-process inspections have been completed. They then perform the remaining inspections and tests to complete the product's certification of compliance. The results of all inspections and tests will be recorded, and only products that pass the final inspection process will be packaged and shipped.

Operators will handle the final machined parts. There are various advanced measurement tools available for many inspection measurements such as size, hardness, color, tolerance, etc.

Post time: Nov-07-2023