Medium-Speed Wire EDM: Advantages and Operating Precautions

A medium-speed wire EDM machine (MS-WEDM) runs the wire at high speed in a reciprocating motion while performing multi-pass cutting, offering a useful combination of accuracy and cutting speed. It sits between high-speed (HS-WEDM) and low-speed (LS-WEDM) machines as a balanced choice for many shops.

1. Core Advantages of MS-WEDM

Multi-pass cutting. Like LS-WEDM, MS-WEDM supports multiple passes. The control system automatically adjusts machining parameters (high-frequency pulse width, pulse interval, power-transistor count and wire speed) according to the program, and the operator can fine-tune them. The final pass uses low current and slow wire speed, producing a smooth surface close to LS-WEDM quality — a practical substitute for part of the LS-WEDM workload.

Three-forward, two-back travel. The wire feeding system reverses automatically: three seconds forward, then two seconds back, so the wire advances gradually. Most machines fix these times, but some control systems allow adjustment between 3 and 10 seconds to suit the job. This mode suits work with relaxed accuracy requirements — the surface shows no visible striping to the eye, but marks still exist, just too closely spaced to see.

Single-side discharge. The wire discharges only while moving in one direction and stops discharging on the reverse stroke. This produces better parts than three-forward/two-back travel because only one direction is discharging, so no wire patterns (marking lines) are left on the surface.

Note: both three-forward/two-back and single-side discharge are single-pass processes. Discharge particles remain on the surface, so surface finish does not match multi-pass cutting.

2. Twelve Operating Precautions

1. Do not open safety guards on the wire feeding unit or worktable during wire running or machining.
2. Never reach over safety guards while the machine is running.
3. Never touch the electrode wire — electric shock hazard.
4. Do not open electrical cabinet doors while the machine is running or powered, to avoid shock.
5. Do not interrupt dielectric flow for extended periods during cutting — it degrades speed and accuracy and damages the wire.
6. An emergency stop (mushroom) button is fitted; press it in an emergency.
7. Install surge and lightning protection for the machine electrical system.
8. The guard is not interlocked with startup — always use it during machining.
9. Disconnect power before any maintenance.
10. Wear protective gear when clamping and unloading workpieces to prevent impact injuries.
11. Clean workpieces at designated stations, wearing goggles, masks and non-slip footwear.
12. If the machine emits abnormal noise, smoke, vibration or odor, power off immediately and have it inspected.

Summary: MS-WEDM’s core value is “multi-pass cutting plus automatic parameter adjustment” — surface quality approaching LS-WEDM at lower cost. Strictly following the safety precautions protects both personnel and equipment.