Deckel FP4A Z-axis Vibration
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  1. #1
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    Default Deckel FP4A Z-axis Vibration

    Hi!

    Today was running program and everything worked like always.
    Suddenly the z axis did strange noise and whole machine vibrated when z axis did rapid motion.

    With feed it also moves jerky and when rapids engage... Crazy vibration.
    Belt seemed to run fine and servo motor did not hear / feel unusual. I was working alone and i need somebody to push rapid button to hear/feel the z axis motor.

    A bearing failure?
    How big job it is to remove the z axis ballscrew/thrust bearings?
    How to approach the disassembly?
    Belt is tightened and fixed in place with motor mounting bolts?

    A short clip of the vibration:

    YouTube

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  3. #2
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    i was digging more PM and ill take a look at the servo tachometer tomorrow...

  4. #3
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    Did a posting of a similar problem that i had on my FP4NC...I was convinced that the issue was mechanical due to the severity of the vibration...
    Changed everything mechanical with no effect. Huge amount of work removing the servo several times to change out the next set of bearings, etc.
    Turned out to be the tach being dirty....Would not have guessed from the symptoms....
    Clean the tach before you take anything major apart.
    Cheers Ross

  5. #4
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    Cleaning the tachometer fixed the problem, how crazy it sounds considering the symptom.


    Picture before cleaning. Nothing major dirt came off. Blew some Air and slowly fed z axis to get it to rotate. A shop towel with brake clean and light pressure did the job

    img_20200530_104310.jpg


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