Incorrect Tap Selection

  • Use specially designed taps for tapping heat treated material.
  • Change to a type of high-speed steel tap that contains vanadium.
  • Apply special surface treatment such as steam oxide or TiN.
  • Increase chamfer length.

Operating Conditions

  • Reduce tapping speed.
  • Apply proper cutting lubricants.
  • Avoid work hardening.
  • Use larger hole size.

Tool Conditions

  • Grind proper cutting angle.
  • Avoid hardness reduction from grinding process.

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