THE thirst for one-hit machining has led to the development of multi-task machine tools that perform traditionally separate processes, such as turning, milling, drilling and tapping, and even grinding in some instances. These 'androgynous' machines represent the fastest growth sector in machine tools. Combining milling and turning on a single machine helps eliminate downtime between operations, improve component accuracy (as it's easier to hold tolerances), reduce fixturing costs and save floor space. Multi task machines come in many configurations. Machines with two (main and sub) spindles and a B-axis spindle enable milling and turning ops on both the front and the back face of the part. Other configurations incorporate turrets holding static or live tooling. Here, simultaneous machining can be achieved both by the opposing upper and lower turrets on one spindle, while the B-axis spindle can be milling a profile or sculptured shape. Opportunities for streamlining component manufacture are huge but the task of actually programming multi task machines is potentially mind-numbing.
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