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What Are Signs That My Metalworking Spindle Is Failing?

Vibration felt within the machine.
Chatter marks showing up on their parts/poor finish.
Inability to properly dress the grinding wheel.
Producing out of tolerance profile size, taper, roundness of the part.

Contact a PDS spindle technician or complete the spindle repair form.

What Is Causing My Spindle to Vibrate?

Excessive spindle vibration may be due to a variety of factors such as: unbalanced collet nuts and tooling, tooling being broken or missing inserts, and tool extensions being too long for the operating speed (reference operator manual, as length becomes greater the operating speeds must decrease).

Contact a PDS spindle technician or complete the spindle repair form.

I Just Installed My Spindle And It Is Running Backwards!

This is common with 3-phase motors with terminal blocks. Switch any two power leads and the spindle will run in the proper direction.

Contact a PDS spindle technician or complete the spindle repair form.

My Spindle Jerks / Vibrates Badly on Startup and Performs Poorly.

This is an indication of single phasing. Verify connections at spindle, VFD, and any connectors.
Send it to PDS for motor diagnostics and repair.

Contact a PDS spindle technician or complete the spindle repair form.

I Am Getting An ‘Over Current’ Or Similar Fault on My VFD.

Verify connections at spindle, VFD, and any connectors are clean, tight, and secure.
Verify VFD parameter settings.
If winding is shorted or insulation broken down, send to PDS for evaluation and repair.

Contact a PDS spindle technician or complete the spindle repair form.

I Just Replaced My VFD And It Keeps Tripping Out.

Start by verifying that these basic drive parameters (Yaskawa) are set according to your spindle. Note: This only applies to asynchronous motors (GC, HSD, FM Euro, Omlat, Etc.).
Verify connections at spindle, VFD, and any connectors are clean, tight, and secure.
If motor winding is shorted, send to PDS for repair.

Contact a PDS spindle technician or complete the spindle repair form.

Spindle Won’t Turn.

Attempt to turn spindle by hand. If it rotates freely, proceed. If not, it has been actuated while running or the bearings are severely damaged. Call PDS for further assistance.
Verify sensor logic is correct and reading properly.
Check that the tool clamp / unclamp valve is not leaking.

Contact a PDS spindle technician or complete the spindle repair form.

My Spindle Is Running Hot.

Verify that your cooling system (liquid, compressed air, electric fan) is operational.
Monitor current draw during the cut. Higher power consumption than normal indicates a blunt tool or high feed speed.
If the spindle is noisy to rotate by hand, it is likely a bearing problem. Send in to PDS for further diagnostics.

Contact a PDS spindle technician or complete the spindle repair form.

My Spindle Has Been Running Fine, And Now It Is Completely Locked Up.

If no other performance issues present, check the solenoid that controls the spindle clamp/unclamp for air leaks. A leaking valve can cause the rotating spindle components to contact the stationary actuator. This friction welds the parts together and is not usually repairable without disassembly. Send to PDS for full diagnostics and repair.

Contact a PDS spindle technician or complete the spindle repair form.

My Spindle Seems To Be Leaking Air Out Of The Front.

This is common with many spindles and is part of the system that keeps contaminants out of the bearings. It is normal.

Contact a PDS spindle technician or complete the spindle repair form.

Breaking Clamping Fingers On Tool Changer.

Check timing of tool-change routine.
Check the timing (Timing) of the tool change.

Contact a PDS spindle technician or complete the spindle repair form.

Tool Is Not Clamping / Unclamping Or Not Holding Tool Tightly.

Verify pull studs are the correct type for your spindle.
Verify sensor logic is correct and reading properly.
Check for broken clamp group (gripper segments).
Drawbar/spring pack assembly could be damaged. Send to PDS for evaluation.

Contact a PDS spindle technician or complete the spindle repair form.

Spindle Stops Over Tool But Will Not Pick Up.

This often is caused by the ‘Tool Open’ sensor (often S2) not reading correctly. Verify proper ejection stroke before attempting to adjust sensor.

Contact a PDS spindle technician or complete the spindle repair form.

Spindle Will Not Release Tool (HSK).

Verify adequate air pressure at spindle.
Verify sensor logic. The ‘Tool Open’ sensor (often S2) not reading correctly can cause this.
HSK tapers operate on a slight interference principle between the tool and the spindle taper.
Maintain a light coat of Lusin G31 on the tool to improve release. Order using PDS P/N 999-090-G31.

Contact a PDS spindle technician or complete the spindle repair form.

Spindle Will Not Release Tool (ISO Or CAT Tapers).

Verify adequate air pressure at spindle.
Verify sensor logic. The ‘Tool Open’ sensor (often S2) not reading correctly can cause this.
Bent or malfunctioning drawbar assembly.

Contact a PDS spindle technician or complete the spindle repair form.

Sensors Not Working Properly.

Before making any adjustment to sensors, look for other root causes that could change the system.
- Verify proper ejection stroke of drawbar / clamp group set. This specification varies by manufacturer but can be found in your machine tool manual or provided by PDS.
- Verify adequate air pressure at spindle.
- Verify pull studs are the correct type for your spindle.
Before making any adjustment to sensors, look for other root causes that could change the system.
If no reading from the sensor can be obtained, remove sensor and test against any metallic object. If still no reading, contact PDS for replacement and assistance.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

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.

Contact a PDS spindle technician or complete the spindle repair form.

Crash

This normally is 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.

Contact a PDS spindle technician or complete the spindle repair form.

Other

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

Contact a PDS spindle technician or complete the spindle repair form.

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