Download and fillout the lathe spindle Inspection Report Checklist below before replacing any parts.
|Symptom||Possible Cause||Corrective Action|
|Workpiece runout||Indicate in workpiece runout depending diameter and spindle speed|
|Long bar stock or liner adapters with a poor fit||Do not run bar stock past the hydraulic union stop. Only use tight fit liner adapters.|
|Spindle drivetrain misalignment||Verify each component is within specified runouts - see Section 2|
|Spindle speed is running in a resonance frequency of the machine||Speed up or slow down the spindle by 10% until vibration or surface finish improves|
|Spindle imbalance||Run a vibration analyzer test. Balance out high vibration using set screws in the union adapter - see Section 3|
|Motor vibration||Run the motor without the belt to isolate motor vibration from spindle vibration|
|Damaged spindle bearings||Run a vibration analyzer test to determine bearing health - See Section 6. Test the spindle lubrication system - See Section 5 and the Spindle Minimum Lubrication System Troubleshooting Guide|
|Encoder feedback||Test the spindle to see if vibration goes away when you cut machine power and allow the spindle to coast to a stop|
|Spindle retaining ring alignment||Sweep with a .001" shim between the spindle shaft nose and ring to check gap - adjust ring if needed|
|The Main Processor PCB standoff hardware is loose or the Control Cabinet mounting hardware is loose or causing a bind.||Tighten the Main Processor PCB standoff hardware. Loosen the Control Cabinet mounting hardware, snug the hardware, then torque down the hardware.|
|Bearing Noise||Ball bearings and cage sound like they are skating around the races - caused by too little pre-load||Run a vibration analyzer test to determine bearing health. Inspect the spindle retaining ring step (that presses on the outer bearing race) for permanent deformation - see Section 6|
|High pitched whining noise - caused by too much pre-load||Run a vibration anaylzer test to determine bearing health - see Section 6|
|Clicking noise - caused by a brinelling of the bearing which occurs when there is an impact to the spindle||Run a vibration anaylzer test to determine bearing health - see Section 6|
|Belt Noise||Tooth wear, tensile break, incorrect belt tension||See Drive Belt Troubleshooting Guide and Section 4|
|Encoder gap incorrect||See Spindle Encoder Troubleshooting Guide and Section 7|
|Encoder ring damaged|
|Encoder cable damaged or loose|
|Alarm 174 Tool Load Exceeded||Insert worn||Inspect and replace insert if necessary|
|Tool load limit incorrect||View the Advanced Tool Managment (ATM) tab to adjust user defined tool load limit|
|Aggressive feedrates||Adjust your program for a more conservative feedrate|
|Alarm 4.116 S (SPINDLE) SPINDLE ORIENTATION FAULT||The workholding has been replaced and the spindle load parameter is not set correctly||Follow Setting 413 Procedure to set the Main Spindle Load Type parameter correctly.|
|Alarm 12.116 SS (SECONDARY SPINDLE) ORIENTATION FAULT||Alarm happens when the subspindle to orient with M119||Check on the mocon tab channel 14 [SS] home switch and move the spindle slowly by hand and verify the bit changes, if it does not check if the home switch or trip flag works properly.|
|The spindle orient position changes after powering down the machine and powering back up.||At power up if the spindle home switch is located exactly in the middle of the two encoder Z pulse locations. Depending on the first spindle rotation direction after booting up the machine, the spindle may pick different encoder Z pulse as a reference for the spindle Z pulse which can cause the spindle orient to be inconsistent.||Update the machine to the latest software and configurations.|
|The machine experiences issues during spindle deceleration, spindle orientation with M19, the C-axis engaging, or the following alarms after changing to a new job with a large or small workholding or a large or small part. Alarms: 650 DC Bus Over Voltage, 4.116 S (Spindle) Spindle Orientation Fault, 9989 C Axis Failed to Engage.||The machine parameters are not tuned for the part or workholding installed.||
Follow Setting 413 Procedure to set the Main Spindle Load Type parameter correctly.
Setting 413 is available for machines with the New Mocon enabled and with software version 100.21.000.1111 or greater. The New Mocon, is a Motion Control algorithm that uses more parameters to better control the axis of the machine. Press Diagnostic and navigate to the System tab. The Mocon version will be in the Software section. Mocon version 1.16 .S. is the New Mocon. If the Mocon Version is 1.16 or 1.16 .K, then you have the old Mocon Version.
Note: At this time we are not updating machines to New Mocon in the field.
Inspect the condition and tension of the spindle drive belts. A belt that is too tight or too loose will induce undesirable vibration. ST-30 NGC gearbox machines with prematurely worn belts will need the ST-30 Gearbox Non-Contact Encoder Upgrade Kit
Refer to the Drive Belts Troubleshooting Guide for more information.
Verify the spindle is getting adequate lubrication by completing a bottle test
Refer to the Lubrication System Troubleshooting links below:
The Haas spindle drive system is a Closed Loop System and requires continuous feedback from the encoder to precisely control the spindle speed via the motor. Inadequate encoder feedback could cause vibration and noise in the spindle drivetrain. Test the encoder feedback by turning the power to the machine off while running the spindle and let the spindle coast. If the vibration goes away when power is off, then troubleshoot the Encoder / Encoder belt / Wye-Delta Contactor / or Vector Drive.
If the machine is equipped with the non-contact spindle encoder, then check the read head alignment with the provided shim (incorrect read head alignment could cause unreliable feedback).
For Encoder troubleshooting information refer to the Spindle Encoder - Troubleshooting Guide.
For Vector drive troubleshooting information refer to the Vector Drive - Troubleshooting Guide.
For Belt troubleshooting information refer to the Drive Belts - Troubleshooting Guide.