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1.Introduction 1.1Definition in elevated spirits urge machining (HSM) enables an increase in efficiency, accuracy, productivity and quality of work-pieces as healthful as a reduction in costs and completion time compared to conventional machining. 1, 2HSM can trace seat to early twenties of 20th century. However, the comments of HSM are varied and complicated. The first definition is proposed by Carl Salomon in 1931. Salomons theory is that the chip-to-tool temperature will begin to come down at a certain cutting speed which is 5 to10 quantify higher than conventional machining speed as shown in meet 1. 1, 3 Figure 1 Salomons theoryNowadays, one popular definition of HSM is based on the DN ratio, which means the bearing bore diameter (mm) multiplied by the supreme spindle speed (rev/min). For high-speed machining, the typical DN ratio is between 500,000 and 1,000,000. Moreover, HSM principally refers to end move at high rotational speeds or show speeds as shown in Figu re 2. Figure 2 exalted further MachiningHSM means utilizing cutting speed significantly higher than conventional machining speed. Generally, a specific range is used to quantitatively define machining speeds, which is shown as follows. 4High speed machining 600-1,800 m/min,Very high speed machining 1,800-18,000 m/min,radical high speed machining 18,000 m/min.The range of high speed milling is shown in Figure 3. Figure 3 Range of high speed millingThere is a comparison between conventional machining and high speed machining shown in the table. ParametersConventionalHSMThe tool/workpiece contact time hankerShortAccuracyLowHighCutting forceHigh LowSurface finishLow High Material removal rateLowHigh Cutting fluidNeed No need normall... ...lusionMachining processes are fundamental and essential steps in manufacturing engineering. HSM as a modern technology can bring about a dramatic increase in efficiency, accuracy, productivity and quality of work-pieces as well as a reduction i n costs and completion time. However, thither are some disadvantages of HSM, which require to be overcome to realize scientific and economic benefits in a better way. Therefore, the potential improvement is proposed, such as the multi-purpose coatings as well as the combination with AR to fit smart HSM. Additionally, it is of vital importance to hold and balance the tool properly to ensure the best performance. With the potential development in the future, HSM can attend more applications in manufacturing engineering, and generate more perfect products in a more safe and effective method and finally contribute to the society.