Common Types Of Failure

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High Radial Load: Occurs when the machine feed rate is too fast for the material being cut or when high feeds are pushing a tool with chipped or very dull cutting edges. This is determined by the failure of the first of the front bearing pair.

High Axial Load: Occurs when the spindle suffers a high axial impact, such as plunging into the material rather than ramping in, or crashing into the work table. This failure is determined by the failure of the second of the front bearing pair.

Imbalance: Failures occur when the tooling used is not properly balanced or exceeds the recommended advised tool dimensions or weight limitations. This failure symptom is observed in the damage to the rear bearing pair.

Operative Actuation: The failure that occurs when the piston of the pneumatic actuator contacts the draw-bar while the spindle is still rotating. This can be caused by operator or programming errors.

The failure or adjustment of the proximity sensors to read the position of the draw-bar or the sensor or relay that senses shaft motion can also cause it.

Another possible cause is contamination of the pneumatic actuator or the exhaust muffler of the actuator. This failure is determined by the witness marks on the end faces of the actuator piston rod and the draw-bar nut.

Shorted Winding: This failure normally occurs when the spindle is not receiving the proper input power. In most cases, it is a result of the parameters of the frequency inverter not corresponding properly to the electrical characteristics of the spindle.

This is normally determined by conferring with the customer.

Tool Sticking In Taper: This is normally due to the transfer of heat caused by an over sized tool. It can also be caused by an improper ejection stroke of the draw-bar due to contamination in the actuator or broken springs in the draw-bar assembly. This is normally determined by the examination of the drawbar.

Tool Slipping In Taper: This is normally due to the transfer of heat from long heavy cuts, resulting in a thermally expanded or contracted tool taper. It can also be caused by an improper ejection stroke of the draw-bar due to contamination within the pneumatic actuator or broken springs in the draw-bar assembly. This is normally determined by the examination of the draw-bar.

Crash: This is normally caused by operator or programming errors. This failure occurs when the spindle is driven into the worktable or surrounding components on robot applications. This is determined by the physical damage of the shaft taper and spindle body.

Operative Actuation: The failure that occurs when the piston of the pneumatic actuator contacts the draw-bar while the spindle is still rotating.

This can be caused by operator or programming errors. The failure or adjustment of the proximity sensors to read the position of the draw-bar or the sensor or relay that senses shaft motion can also cause it.

Another possible cause is contamination of the pneumatic actuator or the exhaust muffler of the actuator. This failure is determined by the witness marks on the end faces of the actuator piston rod and the draw-bar nut.

Other issues: Spindle fails due to unusual circumstances, such as shipping damage, electric fan failure, electronic box malfunction, etc.

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658 Omaha St.
Corpus Christi, TX 78408

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12400 Rose Rd.
Willis, TX 77378

P: 936-229-8589
Emergency: 832-260-1846
E-mail: contact@nngindustries.com
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Copyright © 2022 NNG Industries

Service Locations:

SOUTH TEXAS
658 Omaha St.
Corpus Christi, TX 78408

CENTRAL REGION
12400 Rose Rd.
Willis, TX 77378

P: 936-229-8589
Emergency: 832-260-1846
E-mail: contact@nngindustries.com
NNG Industries24-7 On Call Emergency Services

Copyright © 2022 NNG Industries