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Walter’s FW4 and MW4 positive wiper geometries are designed for longitudinal turning and facing. They combine a “wiper effect” and the wear-resistant Walter Tigertec Gold grades.

The curved wiper cutting edge makes the wiper action universal across various material groups such as steels, stainless steels, cast irons or even super alloys. The wiper action can reportedly be used to reduce machining time by using double the feed rate, while imparting the same surface finish. According to Walter, feedrate increases of up to 300% were successfully utilized, in some cases.

The FW4 universal wiper geometry with a narrow chip breaker, which generates short chips, is for finishing operations. The machining parameters for the FW4 geometry are a feed of 0.0012"-0.020" and a cutting depth of 0.004"-0.100". The primary application is turning steel, stainless steel and cast iron (ISO P, M and K workpiece groups), and the secondary application is turning super alloys (ISO S workpiece group).

The MW4 universal wiper geometry features an open chip breaker groove and longer radius wiper cutting edge for high feeds is for medium machining. The machining parameters for the MW4 geometry are a feed of 0.005"-0.022" and a cutting depth of 0.020"-0.180". The primary application is turning steel and cast iron (ISO P and K workpiece groups), and the secondary application is turning stainless steel and super alloys (ISO M and S workpiece groups).

Because of the wiper edge’s curved design, improved surface quality, productivity and process reliability are achieved even when the machine tool is not aligned 100% precisely, such as if the turret is slightly offset. The new chip breakers also increase the chip breaking range, resulting in less machine downtime caused by the creation of bird nests.