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and manufacture, produces a complete line of jig grinding machines and accessories. In addition, Moore remanufactures older jig grinders to include full CNC ... 2 to 300 rpm Air turbine grinding spindle speeds 6,000 to 175,000 rpm Reciprocation stroke rate (25,4 mm / 1 in.) 2 to 175 cycles/min. Accuracy* Positioning Accuracy: Step Gauge