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Retrofit an existing clamp and drill circuit for maximum effeiciency. The cylinder that clamps the part into place is a 4 inches bore, 2 inches rod diameter, 18 inches stroke with an extended time of 1.75 seconds and a retraction time of 1 second. The customer wants a 25% reduction in the time. The clamping force must be 628 Lbs. The drill feed cylinder is a 2-1/2 inche bore, 1 inch rod diameter, 12 inches stroke which uses only the last 4 inches of stroke for drilling at system pressure. Total extend time for drill feed is 30 seconds with drilling portion of cycle being 28 seconds. the drill motor runs 800 rpm using 28 l/sec (60 cfm) at 3.4 bar (50 psi). what are the necessary Cvs for all valves?
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