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Specialist in on-site, spindle taper grinding for repair and restoration of precision

CAUSES OF TAPER SEAT DAMAGE

Gunn Machine & Tool Company

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.

bellmouth condition

 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.