Which measurement system is predominantly used in machining?

In machining, the decimal inch system is predominantly used because it provides a straightforward and precise method for measurements, which is essential for achieving tight tolerances in machined parts. The decimal format simplifies calculations, particularly when it comes to adding, subtracting, or converting measurements, as it eliminates the need to work with fractions, which can be more complex and less intuitive.

The decimal inch system is versatile and widely accepted in the machining industry, especially in the United States, where this system allows for easier programming of CNC machines and more precise measuring tools. Additionally, many modern digital calipers and measuring tools display measurements in decimal formats, further encouraging its use in machining practices.

While the metric system is also utilized in various engineering and manufacturing fields, especially globally, the preference for the decimal inch system in specific areas of machining reflects the industry's historical reliance on this system and the need for precision in measurement.