Conicity Lab Test 1
Turning Cast Iron Cylinder Liners

Test Information
• Company: Ford Motor Company
• Test Site: Redland, MI
• Date: May 2001

Test Design
• Objective: Evaluate tool wear and cutting force as a function of edge geometry
• Tool Styles: CPG-422 and CNGA-433 CBN Tools
• Edge Preparations:
        • 0.001" uniform edge prep on CPG-422 and CNGA
        • Up-sharp/no edge prep on CPG-422 tool
        • Conicity EMG™ on CPG-422 tool
• Test Part: Cast Iron Cylinder Liners

Figure 1. Flank Wear as a Function of Tool Geometry

Tool Wear Summary • Up-sharp CPG experienced 20% less average flank wear than honed CNGA, 10% less flank wear than honed CPG. • CPG tool with Conicity EMG experienced approximately 40% less flank wear than up-sharp CPG tool.

Feed Force Summary • Up-sharp CPG created 30% less feed force than honed CNGA, 10% less force than honed CPG. • CPG with Conicity EMG created approximately 20% less feed force than up-sharp CPG tool.

Figure 2. Feed Force as a Function of Tool Geometry