Carbide Troubleshooting

Turning

Problem Solution

Reduce Cutting Speed Increase Cutting Speed Reduce The Feed Increase the Feed Reduce The Cutting Depth Increase The Cutting Depth Select a Tougher Grade Select a Smaller Nose Radius Select A Positive Geometry Flank Wear X                 Notch Wear X                 Cratering X   X           X Plastic Deformation X   X             Built Up Edge   X             X Small Cracks perpendicular to the cutting edge             X     Small Cutting Edge Fracture (frittering)   X         X   X Insert breakage     X   X   X     Curling of Long Chips       X   X   X   Vibrations X     X       X X

Milling

Problem Solution

Reduce Cutting Speed Increase Cutting Speed Reduce Feed /Tooth Increase Feed / Tooth Select a more wear resistant grade Select a tougher grade Use a course pitch cutter Change the cutter position Do not use coolant Flank Wear X     X X         Notch Wear X     X X       X Cratering X       X         Plastic Deformation X   X   X         Built Up Edge   X   X         X Small Cracks perpendicular to the cutting edge X         X     X Small Cutting Edge Fracture (frittering)   X       X     X Insert breakage     X     X   X   Vibration       X     X X   Bad Surface Finish   X X   X

Formulas

Cutting Speed, ft/min.

V_C = (Pi * D_c * n)/12

Where

V_C = cutting speed ft.min

n = revolutions/Min.

D_c = diameter inch

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