Harmonic Hum??

[Gary Fitzgerald]

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

[Paul Sarrach]

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

[Mike N.]

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

[Jeffrey Lovely]

turn the radio up
what noise?

[John Kugler]

You have a radio?!?

Wow, I wish I could have a radio.

[Jeffrey Lovely]

they took away the speakers here
1 ear phone is acceptable
put ear plug in the other and noises
disappear

[Paul Sarrach]

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.

[Hilton Roberts]

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

[roland.hubert]

I had the same problem last year. The noise would come and go at different heights. Had to replace the "Z" axis.

[T Miller]

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

[BOB PARSONS]

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.

[J Temmen]

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.

[John Kingston]

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!)

[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.

[tking]

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