Mechanical Engineering

How does the Mohs scale rank gemstone hardness? Why does the metal industry require more precise measurement methods, such as Rockwell, Vickers, and Brinell?

Industrial rubber typically falls within the 40–80 Shore A range, though there is no single standard hardness for all types; components such as gaskets, seals, vibration dampers, and rollers may utilize different hardness levels depending on specific requirements. Temperature also significantly affects measurement results: heated rubber tends to soften—lowering the Shore A value—while cold rubber tends to harden, causing the Shore A reading to rise.

Both Shore A and Shore D are used to measure material hardness, but each scale is suited to a different group of materials. Soft rubber, silicone, or elastic gaskets are typically tested using Shore A, whereas hard plastics, engineering plastics, and materials with low deformation are better suited to Shore D

Learn how to choose and use a feeler gauge correctly to reduce measurement errors during mechanical inspection and maintenance.

When using metric or inch feeler gauges, the measurement system should match the product's original design specifications. Otherwise, conversion and rounding errors may accumulate across multiple mating surfaces, causing the final clearance to deviate from the intended design value.

A smaller clearance is often associated with higher precision. However, in mechanical engineering, reducing clearance does not necessarily make a mechanism operate more accurately.

During the operation of industrial machinery or the transportation of goods, persistent mechanical vibrations inevitably occur; these are a primary cause of material fatigue, loosened connections, and cracking in printed circuit boards (PCBs). To ensure product integrity before delivery to customers, R&D and QA/QC engineers must simulate these dynamic forces using vibration test systems.

Many projects encounter a situation where a freshly applied coating looks perfectly uniform and paint consumption matches the estimate, yet additional coating is required during inspection because the thickness is insufficient. This leads many to suspect measurement errors or equipment inaccuracy, whereas the actual cause is a confusion between WFT (Wet Film Thickness) and DFT (Dry Film Thickness)

Many used car buyers often spend a considerable amount of time examining the paintwork, the gaps between body panels, or the overall condition of the exterior. However, these signs can be skillfully masked following repairs; precise color matching and careful polishing can make the vehicle appear almost factory-original.

A fire-retardant coating only provides effective protection when applied to the specified design thickness. A shortfall of even a few hundred microns can significantly reduce fire resistance, whereas an excessively thick coating is prone to cracking and peeling, in addition to increasing material costs