Case Study Solutions Opening Drill® Case Study: Industry: Part: Material: Item: Depth: Diameter: 6503 Automotive Gear Blank Free Machining Steel 1.50" 6.0” OP2-1L-SS-1.5 Allied Machine Solution Opening Drill® Drilling the 1.50" diameter hole • 635 RPM • 500 SFM • 0.005 IPR • 3.18 IPM • Cycle time = 1 minute 53 seconds Followed by ONE boring pass • 492 RPM • 400 SFM • 0.005 IPR • 2.46 IPM • Cycle time = 2 minute 26 seconds Total cycle time = 4 minutes 19 seconds Previous Tooling 2.00" OTM Core Drill Drilling the 1.50" diameter hole • Hole depth = 6.0" • 764 RPM • 400 SFM • 0.004 IPR • 3.056 IPM • Cycle time = 2 minutes Followed by several boring passes to size the hole • 492 RPM • 40

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