Walter’s Prototyp Proto.max ST improves end mill performance
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The Prototyp Proto.max ST solid carbide end mill is said to improve machining performance by up to 50 per cent during both roughing and finishing tasks on steels, including stainless.
The end mill is available from Bromsgrove-based Walter GB in diameters from 2 to 20 mm and as a three- and four-flute design, with or without a corner radius of 0.2 to 4 mm.
Proto.max ST features a TAZ coating which has a finish layer of zirconium nitrate that significantly contributes to the increased output and provides a smooth, low-friction surface that prevents the formation of built-up edges.
The three-flute Proto.max ST can mill to a depth of up to two times diameter; the four-flute version up to 1.5 times, and both models have a reduced neck and back cutting to prevent 'waterlines' when pocket or plunge milling at angles.
In addition, a stable micro geometry prevents edge wear, an uneven pitch provides smooth running, and a helix angle of 45° (three-flute cutter) and 50° (four-flute) provides a smooth cut and good chip transport. All these features contribute towards a significant reduction in cutting forces and therefore spindle stress.
