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Frequently Asked Questions

Spindles are technical in nature and it is best to call and talk to a PDS spindle technician for answers to your application, wiring and configuration questions. Some questions are asked more frequently than others. This section provides many of the more common questions. If there is any confusion or uncertainty, our applications and service group are here to answer your technical questions by calling PDS at 704-922-1206. Or if you prefer, email us at spindles@pdscolombo.com. For best service, please have your spindle model number and spindle serial number available when contacting us.

High Radial Load

The failure that 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

The failure that 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.

Unbalanced Tooling

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.

Actuation While Running

The failure that occurs when the piston of the pneumatic actuator contacts the drawbar 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 drawbar 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 drawbar 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 oversized tool. It can also be caused by an improper ejection stroke of the drawbar due to contamination in the actuator or broken springs in the drawbar 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 drawbar due to contamination within the pneumatic actuator or broken springs in the drawbar assembly. This is normally determined by the examination of the drawbar.

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.

Other

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