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In traditional plunge grinding, a constant infeed rate of wheel head is selected and grinding efficiency may in general become lower with better grinding quality. In this paper proposed is a new plunge grinding technique, in which the infeed rate of wheel head is linearly controlled with grinding time, for increasing grinding efficiency without detriment to grinding quality. In the new process the accumulated amount in grinding system decreases in the latter stage of wheel head infeed and then the grinding efficiency can be increased with a required quality and a given grinding allowance. Under a certain condition the new process becomes more advantageous in both efficiency and quality than traditional one. (Wassmann)