Many people claim that Medium-speed Wire EDM (MS-WEDM) improves machining accuracy and surface finish, claiming it can replace Slow-speed Wire EDM (LS-WEDM).

Many people claim that MS-WEDM improves machining accuracy and finish to replace LS-WEDM. After discussing with industry experts, I believe this is purely nonsense. Without solving the displacement deviation caused by molybdenum wire reversal (which limits fast-speed wire cutting), the claim of significantly improved accuracy is groundless. Because after reversing, the wire is no longer in its original position; coupled with wire vibration, the cutting accuracy cannot be smaller than these fixed, insurmountable errors. On the contrary, multiple cutting in MS-WEDM may actually reduce accuracy.

Currently, most of the manufacturers claiming improved accuracy are non-mainstream. The national standard for cutting a 28mm octagon has an error of 15μm; achieving 10μm is credible now, but I don't believe in any higher precision.

Indicator: The indicators seen in advertisements are still from "Shanghai Tielue," where it is written that the machining accuracy is <0.3μm. At this level of accuracy and price, most slow-speed wire manufacturers should close down and buy molybdenum wire instead.