A contract machine shop that specializes in turning and drilling is producing components for a large manufacturer of military tanks. They are using a Quick Drill CNC VMC with water soluble coolant. The part being machined is a large stainless steel ring.
Previously the customer was using a Greenfield 17/32″ Taper shank cobalt twist drill running with 60 PSI flood coolant. The tool produced a 5.0″ deep hole with a 0.5312″ diameter. They were peck drilling with a full retract every 0.050″. Running at a speed of 60 SFM, 431 RPM, 0.008 IPR, and 3.45 IPM, the tool had a cycle time of 10 minutes 8.4 seconds and a tool life of 4 holes. The customer wanted to lower their cost of production.
AMEC’s Application Engineers recommended the ASC 320® 9X diameter drill, item #390E05312A21M. It was advised that the tool be run at a speed of 135 SFM, 971 RPM, 0.006 IPR, and 5.82 IPM. Due to the low coolant pressure, the chips produced by the tool could easily be evacuated without using a peck operation. The results were outstanding. With a cycle time of only 51.5 seconds, the ASC 320® tool lowered the machine’s total cycle time. With a life of 228 holes, the customer also significantly increased tool life. Additionally the ASC 320® tool produced a superior hole quality and greatly lowered the customer’s cost of production. The total cost savings was $43,150.40 or 91.7%.
Due to the successful performance of the ASC 320® tool, the customer was able to increase tool life, reduce cycle time, and produce a superior hole quality while lowering the cost of production.