Various types of quality inspections are carried out at manufacturing sites. Pinhole inspection is also a type of quality inspection used in the field of manufacturing, but few people may understand how it works. In this article, we will explain the mechanism, types, and usage scenarios of pinhole testing. What Is A Pinhole? A pinhole is a small defect that is so small that it is not visible. A pin means a needle, a hole means a hole, and a defect that looks like a small hole drilled by a needle is called this. Whether it’s construction, food, or pharmaceuticals, pin......

In Previous articles, we explained the meaning and types of Geometric Dimensioning and Tolerancing (GD&T), and their differences from size tolerances. This time, we will explain Form tolerance (aka shape tolerance), which is a type of geometric tolerance. It is an important and fundamental characteristic that determines the function of the part, so please learn about it. 1. What Is Form Tolerance (Shape Tolerance)? “Form tolerance” regulates how far a shape (*) such as an indicated plane or straight line can be biased from the ideal shape. This tolerance......

To determine how accurate the circular shape should be, measure the roundness of the circular cross-section such as the axis, hole, cone, etc. Workpiece GD&T Roundness Measurement (Detection) Methods As we all know, people cannot draw a perfect ideal circle. With the advancement of science and technology, people can only get infinitely close to the ideal roundness in the process of industrial processing of parts. Roundness Refers to an indicator of the actual circle to the ideal circle variation, its tolerance band is the tolerance value t as the radius of the differ......

Are geometric tolerances important? How is it different from size tolerance? In this post, we’ll answer these questions. Differences Between Geometric Tolerances & Size Tolerances Geometric tolerances have an image that is difficult to grasp, so it seems difficult to understand. However, if you make good use of geometric tolerances, you will be able to draw good drawings without mistakes and prevent problems with transmission to the processor. In this article, we will explain the basics of geometric tolerances and why you should acquire them. If you are a design begi......

To prevent any negative impact on subsequent production quality caused by design changes, process adjustments, unplanned line stops, production changes, and line transfers, it is necessary to conduct a first article inspection during the job preparation verification and post-production verification phases. However, there are some common misunderstandings and areas for improvement when it comes to first article inspection. One common misunderstanding is that first article inspection is only necessary for new products or major changes. In reality, it should be conducted for every p......

Parts have design intentions such as “I want this part to be a flat surface within a certain range of conditions” or “I want it to be straight” for the convenience of establishing a function or assembling it. When displaying a shape in a drawing, it is necessary to ensure that such information is included, and the rule is that it is displayed in the form of geometric tolerances in the drawing. In this article, we’ll cover the basics of geometric tolerances that designers and producers need to understand, the types of geometric tolerances that are commonly u......

The first article inspection may be performed in different ways according to the products and requirements. What are the different types of first article inspection? We’ll also talk about the differences between FAI and PPAP. What are the Types of First Article Inspections? First Article Inspection (FAI) is a critical process in manufacturing that verifies the initial samples of a new product or component. The purpose of an FAI is to ensure that the product or component meets all the specified requirements before mass production begins. There are three types of First Arti......

The final inspection is a critical step in the quality control of manufacturing to ensure the quality of the finished products. Why do you need a final inspection and how is product final inspection done? What is the Final Inspection in Quality Assurance? A final inspection is a critical step in quality assurance that is performed at the end of the production process to ensure that the final product meets all the required quality standards and specifications. The purpose of the final inspection is to identify and address any defects or issues that may have occurred during the m......