GF AgieCharmilles CUT X 350

iWire is GF AgieCharmilles' patented wire management system. During cutting, the wire undergoes thermal and mechanical stress that progressively degrades its condition. Conventional machines feed wire at a constant rate that is conservative enough to prevent breaks under worst-case conditions — meaning the machine uses more wire than necessary during less demanding cuts. iWire uses sensors to monitor wire condition in real time and adjusts the feed rate dynamically: slower when the wire is in good condition, faster when conditions are more aggressive. The result is that only as much fresh wire is used as each part of the cut actually requires, reducing total wire consumption by 15–30% compared to fixed-rate machines. The same monitoring system also allows iWire to proactively increase feed rate when the wire approaches critical condition, preventing breaks before they occur.

Achieving Ra 0.05 µm requires a multi-stage cutting sequence: a rough cut establishes the geometry, followed by progressively lighter skim passes with reduced discharge energy, finer wire, and optimized dielectric conditions. The CUT X 350's IPG generator in its CUT X configuration uses very short discharge pulses with precise energy control at the finest finish stages. The linear motor drives ensure that the wire follows the programmed path without the positional errors that would create surface irregularities. Typically, four to six skim passes are required to reach Ra 0.05 µm from a standard rough cut finish. Workpiece material, wire cleanliness, and dielectric quality all affect the achievable result.

The CUT P 350 is GF's precision tooling-focused machine with accuracy and surface finish optimized for punch and die work, achieving Ra 0.10 µm. The CUT X 350 surpasses this with Ra 0.05 µm capability and adds iWire technology for wire management. The CUT X 350 also supports finer wire down to 0.05 mm versus 0.10 mm on the CUT P 350, and offers a wider ±30° taper range. The CUT X 350 costs approximately $60,000–$100,000 more than the CUT P 350. For shops whose work demands the finest possible surface finish or whose wire economics benefit from iWire, the CUT X 350 is the appropriate choice; for standard precision tooling work, the CUT P 350 is a better value.

For high-speed rough cutting, 0.25 mm coated wire (stratified zinc-diffused brass) provides maximum cutting speed. For semi-finish and finish passes where Ra 0.10–0.20 µm is targeted, 0.20 mm plain brass wire offers better surface quality. For final mirror-finish passes at Ra 0.05–0.08 µm, 0.10 mm or finer wire enables the tightest discharge gap and the lowest discharge energy consistent with stable cutting. The CUT X 350's iWire system is particularly effective with 0.20 mm wire on multi-pass programs, as the variation between rough and finishing conditions is where adaptive wire feed rate provides the greatest benefit.

The CUT X 350 is capable of running 0.05 mm wire for micro-EDM applications. At 0.05 mm wire diameter, the minimum kerf width is approximately 0.06–0.07 mm, enabling features and slots not achievable with standard wire. However, 0.05 mm wire is fragile and requires very stable dielectric conditions, precise wire guides in excellent condition, and conservative cutting parameters to avoid frequent breaks. The IPG generator in CUT X configuration includes parameter tables for fine wire, but micro-EDM with 0.05 mm wire demands experienced operators and careful process development. It is a capability rather than a routine production mode.