Harmonic Hum??

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  • Harmonic Hum??

    Started happening this morning on a Global "fx". Harmonic hum sounds like its resonating from "Z" tower case. Hum changes pitch and tone when "Z" height is changed. Altering X & Y does not affect the hum.

    Anyone have this one before??? Know what’s causing it??

    Appreciate any feedback

    Thanks a Mil

    G man
    sigpicThanks a Millionth

  • #2
    Do you hear this sound when its just sitting, that Sounds like a airleak. If its when you are moving it up and down, I would stop now, and have someone look at it. You can pull the cover off and look. Air leaks are common in all cmm's
    sigpicSummer Time. Gotta Love it!

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    • #3
      Sounds to me like air bearing "chatter" and definitely makes sense based on the position of the Z column. Similar to a slide whistle we had as kids. Take the cover off and listen for the suspect bearing and have service check for embedded dirt or worn/loose bearing issues.

      Was the machine recently crashed without your knowledge? Sounds possible if it just occured without any progression in "volume" of the sound.

      Just my opinion
      sigpiccall me "Plum Crazy"....but you only go around once!

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      • #4
        turn the radio up
        what noise?
        DR Watson shut me down again !!!! :mad: Smoke break:eek:

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        • #5
          You have a radio?!?

          Wow, I wish I could have a radio.

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          • #6
            they took away the speakers here
            1 ear phone is acceptable
            put ear plug in the other and noises
            disappear
            DR Watson shut me down again !!!! :mad: Smoke break:eek:

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            • #7
              Originally posted by Jeffrey Lovely
              turn the radio up
              what noise?

              God I loved that!

              Jefferey, that sounds like Moeller Aerospace in Wixon.

              I wish I could get a Harmonic Hum at Work in my Z axis, Heck, I would wish I could get on at Home.
              Last edited by Paul Sarrach; 04-17-2006, 03:02 PM.
              sigpicSummer Time. Gotta Love it!

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              • #8
                Check to see if the air pressure in the whole system is a little down.

                If the plant air was worked on and the system supply air is a little off the previous setting, you can get some noise from the bearings. If you have access to the regulator, turn it up or down a little and see if the sound goes away.

                H
                Hilton Roberts

                "Carpe Cerveza"

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                • #9
                  I had the same problem last year. The noise would come and go at different heights. Had to replace the "Z" axis.
                  sigpic'To boldly go where no man has gone before'

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                  • #10
                    I have had the same thing.. on an Fx
                    I went to clean the z rail and took some of the screws loose on the case...
                    Seen I couldn't get it off without removeing the head. So just being off a tad it would rub at times when I had the temp up in the room or just whenever it felt like it.. I found the spot it did it the most in and reajusted the case.. Problem went away... Glad it wasn't anything else wrong.. like some of the replys above
                    sigpic
                    if you had soap on a rope it would be tied to yer ankle

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                    • #11
                      HUM

                      IF IT'S NOT AIR RELATED A SERVO MOTOR GOING BAD
                      WILL MAKE THE EXACT NOISE AND SYMPTOMS YOU
                      ARE DESCRIBING. SOMETIMES IT'S AN ADJUSTMENT ON THE SERVO
                      BOARD TO CORRECT THE HUM FROM THE MOTOR. I'VE HAD THIS
                      SEVERAL TIMES ON THE OLDER WORLD CONTROLLERS. I DON'T KNOW
                      IF YOUR "NEW " CONTROLLER OR SERVOS WOULD HAVE THE SAME ISSUES.
                      GLOBAL FX 12-15-10
                      3.7MR3, XP/SP2
                      EXCEL 12-20-10, 9-12-9, 7-10-7

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                      • #12
                        I hate to sound like a salesperson but if you can't solve it on your own give us a call. 734-451-8740 and ask for Tom Snyder. We can help.Tell him Jim told you to call.
                        James Temmen

                        There is no job so simple that it can't be done wrong.

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                        • #13
                          I had a similar but different issue, with the x-axis. Had service in. Had a blocked air-bearing. Can you see anything on any of the surfaces that the bearings ride on? I had a white film on mine.

                          AND, for all the smart aleks......

                          Are you sure it's not a Dynamo Hum? (Rimshot goes here!)
                          When in doubt, post code. A second set of eyes might see something you missed.
                          sigpic

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                          • #14
                            I was hearing the same thing. "TWICE" The first time we found that we were getting oil and water in the lines once we fixed that it stoped. The other time it was simplely that the counterweight presure needed some fine adjustment. I hope this will help. Good luck.

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                            • #15
                              Originally posted by Tested
                              I was hearing the same thing. "TWICE" The first time we found that we were getting oil and water in the lines once we fixed that it stoped. The other time it was simplely that the counterweight presure needed some fine adjustment. I hope this will help. Good luck.
                              I was going to have you check your air quality as well, gotta love all the expertise on this forum!

                              TK
                              sigpicHave a homebrew

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