Bypassing Spindle Alarms During Repairs for Fanuc CNC
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Something Fanuc CNC related that I just learned last week:
Many times during a spindle replacement service, it is necessary to disconnect or remove the spindle sensor (position coder or high resolution magnetic pulse coder.) The alarms that occur as a result of this disconnection may inhibit NC operations or other machine functions that would be desired to complete the needed repairs. Maintenance related M-codes may no longer work. This can be aggravating and add time to the job. For example, you may want to use service M-codes to change pallets (on a horizontal), and, due to the alarms, you might have to over-ride solenoid valves to accomplish the APC functions. I don’t know why I didn’t learn this years ago, but most sensor related alarms can be temporarily disregarded by the Fanuc CNC, so that the service work can continue without delays, by changing a parameter setting on the Fanuc control.
The alarms I’m discussing here are as follows:
AL-26
AL-27
AL-28
AL-41
AL42
AL-47
If you’ve worked on machines for a while, you’ve seen these alarms before.
Let’s first discuss AL-26, AL-27, AL-28. The Fanuc parameter manual describes the related parameter as follows:
“PLCS: Determines high-resoltion magnetic pulse coder and position coder signal disconnection detection.
0: Performs disconnection detection.
1: Does not perform disconnection detection.”
So, this parameter set to 1 = no alarm AL-26, AL-27, AL-28.AL
PLCS for a:
Fanuc 16=4007.5
Fanuc 15=3007.5
Fanuc 15i= (bit not specified)
Fanuc 0C=6507 (bit not specified)
Next let’s look at AL-41, AL-42, AL-47. The Fanuc parameter manual describes the related parameter as follows:
PCALCH: Enables or disables detection of alarms (AL-41,42,27) related to the position coder signal (9A11.C, 9A21.A, 9A50.A).
0: Detectes alarms related to the position coder
1: Does not detect alarms related to the position coder signal. When the spindle is not connected with the position coder on a one-for-one basis, set this parameter to 1 to avoid erroneous detections.”
Set this parameter to 1 = no AL-41, AL-42, AL47.
PCALCH for a:
Fanuc 16=4007.6
Fanuc 15=3007 (bit not specified)
Fanuc 15i=3007 (bit not specified)
Fanuc 0C=6507 (bit not specified)
When I get the opportunity to try this on various controls, I will update the “bit not specified” parameters mentioned above. Sorry about that.
As always, you can contact me at info@pinpointcnc.com. If I can help you out, I will.
Check out www.pinpointcnc.com for machine repair information, procedures and other products
Go to www.cncalarm.com for machine alarms and details
Go to www.toyookivalve.blogspot.com for information on Toyooki products
Go to Fanuc CNC Central for all Fanuc related posts
Filed Under Fanuc Control | Leave a Comment
Mori Seiki SL-253B Spindle Removal
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BUILDER: MORI SEIKI
MODEL: SL-253B/500
CONTROL: MSC-500
TITLE: SPINDLE REMOVAL PROCEDURE
SUMMARY: SPINDLE REMOVED AND SENT FOR REPAIR (BEARING REPLACEMENT)
DETAILS: SPINDLE NOISE DUE TO BEARING DAMAGE
PRIOR TO DISASSEMBLY, THE SPINDLE WAS RUN TO AN RPM WHERE THE NOISE WAS CLEARLY PRESENT (IN THIS CASE AS LOW AS 300RPM). WHILE THE SPINDLE WAS RUNNING, THE MAIN BREAKER (MAIN POWER AT THE ELECTRICAL CABINET) WAS SHUT OFF TO VERIFY THAT THE NOISE WAS INDEED MECHANICAL IN NATURE AND NOT BEING GENEREATED ELECTRICALLY. THE NOISE CONTINUED AFTER THE POWER WAS SHUT OFF AND DECREASED IN VOLUME AS THE SPINDLE COASTED TO A STOP. WITH THIS OBSERVATION, THE SPINDLE COULD BEGIN TO BE DISASSEMBLED TO ISOLATE THE NOISE FURTHER.
THE ATS COLLET CHUCK WAS REMOVED.
THE STEEL PLATE COVER SURROUNDING THE SPINDLE IS REMOVED. IT WAS NECESSARY TO USE (2) JACK-SCREWS ON THE TAPPED HOLES IN THE COVER TO REMOVE IT. IF POSSIBLE RUN THE SPINDLE TO SEE IF THE NOISE IS STILL PRESENT AFTER THIS IS REMOVED. CHIPS COLLECTING BEHIND THIS PART CAN CAUSE RESTRICTION TO ROTATION AND NOISE WHEN RUNNING.
NEXT THE BLACK LABRYNTH COLLAR WAS REMOVED EXPOSING THE MOUNTING SCREWS IN THE FRONT FLANGE OF THE SPINDLE.
DISASSEMBLY WAS THEN STARTED ON THE REAR OF THE SPINDLE.
THE CHIP TRAY MOUNTED UNDER THE COOLANT COLLECTOR OF THE ACTUATOR CYLINDER WAS REMOVED.
THEN THE RETURN HYDRAULIC HOSE UNDER THE ACTUATOR.
NEXT THE CHUCK CLAMP CONFIRMATION SWITCHES WERE REMOVED. THE POSITION OF THE MOUNTING PLATES WERE MARKED FOR USE AT REASSEMBLY.
THE HYDRAULIC HOSES FOR THE ACTUATOR WERE THEN MARKED (GREEN WIRE-TIE) AND REMOVED. THEY WERE PLUGGED (ON THE HOSE SIDE, NOT THE ACTUATOR SIDE) SO THAT POWER COULD BE TURNED ON TO THE MACHINE IF NEEDED WITHOUT LOSING HYDRAULIC FLUID.
THE ACTUATOR SCREWS COME IN FROM THE BACK OF THE ADAPTER. THESE WERE REMOVED NEXT. YOU WILL NEED AN 8MM HEX KEY THAT HAS BEEN CUT TO ALLOW THE WRENCH TO FIT. REMOVE THE PROXIMITY SWITCH FOR SPINDLE ROTATION DETECTION TO AVOID DAMAGING THE SWITCH.
THE ACTUATOR AND DRAW-TUBE WERE THEN REMOVED AS ONE PIECE AND SET ON THE FLOOR. AGAIN, IF POSSIBLE, RUN THE SPINDLE AFTER THE ACTUATOR IS REMOVED TO MAKE SURE THAT BAD BEARINGS IN THE ACTUATOR ARE NOT THE SOURCE OF YOUR SPINDLE NOISE.
IF THE NOISE IS STILL PRESENT, THE ADAPTER FOR THE ACTUATOR IS NEXT TO BE REMOVED. THE SIX M8 SCREWS IN THE FACE GO ALL THE WAY THROUGH TO A NUT ON THE BACK SIDE. THESE ARE REMOVED FIRST. LOOSENING THESE WILL RELEASE THE LOCK-NUT ON THE BACK OF THE ADAPTER.
YOU CAN USE A SPARE SCREW IN ONE OF THE OUTER HOLES FOR STRIKING IN ORDER TO LOOSEN THE ADAPTER FROM THE SPINDLE SHAFT (TURN CCW TO REMOVE). YOU WILL HAVE TO REMOVE THE BLACK SHEET-METAL COVERS BEHIND THE ADAPTER IN ORDER TO SPIN IT OFF THE SHAFT.
NEXT IS THE NUT HOLDING THE SENSOR RING IN PLACE. FIRST LOOSEN THE SET-SCREWS THE TAP THE NUT LOOSE AND REMOVE. YOU MAY WANT TO REMOVE THE SPINDLE SENSOR TO AVOID DAMAGE TO THE SENSOR FACE.
NEXT REMOVE THE SENSOR RING. THE BACK SIDE IS NOW DONE.
ON THE FRONT SIDE, REMOVE THE OUTER BOLTS ON THE FLANGE OF THE SPINDLE. THIS IS THE LAST THING TO BE DONE BEFORE REMOVING THE SPINDLE FROM THE BORE.
SUPPORT THE FRONT FLANGE OF THE SPINDLE WITH AND EYE BOLT. USE A PIECE OF WOOD FROM THE BACK SIDE TO STRIKE AND START THE SPINDLE OUT OF THE HOLE.
WHEN THE SPINDLE IS OUT SEVERAL INCHES, WRAP IT WITH A STRAP AND SUPPORT WITH A HOIST. KEEP THE SPINDLE LEVEL AS IT COMES OUT AND SUPPORT THE BACK OF THE SPINDLE SHAFT TO AVOID DAMAGE TO THE REAR SUPPORT BEARING AND THE STATOR WINDINGS INSIDE THE SPINDLE HOUSING.
Check out www.pinpointcnc.com for machine repair information, procedures and other products
Go to www.cncalarm.com for machine alarms and details
Go to www.toyookivalve.blogspot.com for information on Toyooki products
Go to Fanuc CNC Central for all Fanuc CNC related posts
Filed Under Machine Tool Repair Procedures with Pictures, Mori Seiki | Leave a Comment
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