Slicing, Grinding & Wire-cut Machines

Selection criteria

Kerf loss, dimensional accuracy, chipping control.

Supply chain

Magnet machining uses slicing, grinding and wire-cut machines, mostly from Chinese makers serving Ningbo, Baotou and Ganzhou magnet clusters. Tight arc tolerances and chipping control are what you pay for in finished magnet segments.

Buyer FAQ

Inner-diameter saw, multi-wire saw or wire EDM: which should I use?

Inner-diameter (ID) blade saws lose roughly 0.3–0.5 mm per cut and slice one piece at a time. Multi-wire diamond saws lose about 0.2–0.35 mm and cut a whole block in one pass, so they save expensive rare-earth material in volume production. Wire EDM is slow and leaves a recast layer, so it is mainly used for prototypes and complex profiles.

What tolerances and chipping limits are realistic for ground arc magnets?

Ground NdFeB and ferrite arc segments commonly hold ±0.05 mm on thickness and width; ±0.02–0.03 mm is possible but costs more. Sintered magnets are brittle, so specify a 0.2–0.3 mm edge chamfer and a written chipping limit, for example no edge chip larger than 0.5 mm and none on the working arc face.

Should magnets be machined before or after magnetising?

Always before. Magnetised parts attract grinding swarf, are hard to fixture and can snap together and chip. Bare NdFeB also rusts quickly after wet grinding, so machined parts should be cleaned, dried and coated without long storage in between.

Where it is used