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Modular Control Block Options A1 - Full Feature Block l Pneumatic signal ports for stop, start and cycle complete l Facility for using proximity switches to sense depth and datum positions l Control of feed and retract speed A6 - Simple Control Block l Forward and retract port for control via remote valves l Facility for using proximity switches to sense depth and datum positions multiple spindle and tapping heads General Information l All performance data is obtained at a line pressure of 6.3±0