800-859-7979
International: 269-553-2557
Gunn Machine & Tool Co.
Gunn Machine & Tool Co.
Gunn Machine & Tool Co.
Gunn Machine & Tool Co.
Gunn Machine & Tool Co.

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SOME SYMPTOMS OF SPINDLE TAPER SEAT DAMAGE OR WEAR:

IF YOUR MACHINE IS EXPERIENCING ANY OF THESE PROBLEMS THE CAUSE COULD BE THE TAPER SEAT. Contact us for machine repair.

  • TOOL RUNOUT
  • LOSS OF PRECISION
  • OUT OF ROUND BORES
  • ERRATIC BORE SIZING
  • TOOL CHATTER
  • STEPPING OF CUTTER BLENDS
  • OVERALL MACHINE PERFORMANCE AND REPEATABILITY FALTERING
  • FRETTING
  • FRETTING
  • WEAR ON FACE KEYS
  • TOOL HOLDERS STICKING

CAUSES OF TAPER SEAT DAMAGE

WEAR - Tool pressure & heat generated from cutting contribute to the deterioration of the taper seat. Normal wear usually causes a Bell Mouth condition, which causes further and more rapid wear.

Bell Mouth

BELL MOUTH CONDITION IS TYPICAL OF TOOLING SEAT WEAR. MANY TIMES THE WEAR MAY BE CONCENTTRIC TO THE SPINDLE BEARINGS, SO WHEN CHECKING FOR SPINDLE RUN OUT WITH AN INDICATOR, THE CONDITION CANNOT BE DETECTED. HOWEVER, WHEN THE MACHINE IS WORKING AND PRESSURE OF CUTTING APPLIED, THE TOOL HOLDER UNSEATS, CAUSING THE PROBLEMS ASSOCIATED WITH A BAD SPINDLE TAPER SEAT.

WRECK - Broken cutters, retention knobs, and drawbars could be the result of preexisting taper damage. As the power is transmitted through the taper seat, a poor fitting taper may let go. Wear on the keys in the face of the spindle may be evidence the taper is not holding.

DIRT - Dirt & chips find their way between the tool and spindle. Automatic tool changers may be equipped with air shot cleaners, but when you add coolant to the mix, they become less than reliable.

AUTOMATIC TOOL CHANGERS - ATC misalignment may cause tool holders to drag on one side of the seat every time a tool is put in and taken out, causing wear on one side of the seat.

MANUAL TOOL CHANGES - Heavy tools may cause the operator to bump the end of the tool against the taper seat, creating dents and raised areas around them. Look for dented or pitted surface of taper seat.