Hello to everyone.
I'd like to say thanks to T. O'Hanlon for helping to keep the board alive and also thank you to Joe Peterson. This board has been a great help for me as a stand alone newbie just by reading all the old posts.
I have a bearing that's showing a multiples of 1x in the Peakvue is this an indication of looseness or possibly 1 impact per revolution?
Viewing the polar plot shows the event happening in the same spot every revolution if I'm using the Polar plot correctly. The standard spectrums not showing any indication of increasing looseness. This is on a belt driven Band saw wheel.
I'll try attaching the data - usually kicks my butt.

It looks probably like 1x impacting, perhaps from looseness. Can you get another peakvue spectrum plot that that goes only as high as the inner and outer race characteric frequencies and leave off the markers?

Hi Wally, how's the sawmill?

Ron Ensing

Duncan - not sure what you mean by "that goes only as high as the inner and outer race characteric frequencies" would you be looking for an Fmax of the 1x of the inner race frequency?

Ron - Mills going good but I'm partially insane. In the process of changing our CMMS over to One World, entering equipment,cat codes and rebuilding outdated pm's and creating ones for equipmnet that was over looked in the origianl set-up. My predictive program is slipping but the days are only 24 hours long. Lots of OT doing both jobs

Wally - the usual race frequencies. The 1x time peaks looks modulated by something, perhaps the innner race. On the other hand, if it's belt driven, it could be just a cyclical variation in the belt tension. It doesn't look bad at this point.

Wally,

If you use the AutoCorellation plot of the PeakVue TWF you may clearly see that there is actually some other (higher then 1x) frequency being modulated by 1x. I have, kind of, flipped over the approach as to what is the carrying frequency and what is the modulating one, but why not if that is what you'll see in the plot?

Could you please post the AutoCorellation plot with the cursor on the higher frequency?

Duncan - Is this what you were looking for? Sorry I'm pretty lame in the terminology department. The amplitudes wouldn't bother me but the headphones and Peakvue data say there is something going on that wasn't there before.

David_G - not sure if this is what your looking for.

The autocorellation TWF clearly indicates a very repetative event once per rev. No any other repetative events are present. Is it due to due to the looseness or because of a cracked inner race? Hard to say for certain but it is hard to expect that looseness will result in such a high level of repeatability.

Hi Wally,

Post us a normal velocity spectrum with an Fmax of 1K and 800 lines(vertical scale of .1 in/sec)and a waveform (4096 points) .
The Peakvue you are showing here only has a HP Filter of 500 Hz, so whatever Peakvue is showing could be fairly visiable in the normal velocity spectrum and the Peakvue 1X might be sidebands off some carrier or even harmonics carrying from the normal 1x to out past 500 Hz.

Email me the point in a small database if you would like.
jraquel2@comcast.net

Wally - yes, that was what I wanted. It still just looks like a low level 1x impact.

David – You mention a cracked inner race, how is it a cracked inner race would show up at a 1x TS in a Peakvue? I’ve heard it mentioned by the papermill guys but have never seen one or any data from one.

Ralph, David – I’ll Post a normal velocity spectrum from work in the morning.

Ralph – How do I create a small database for mailing?

quote:

Ralph – How do I create a small database for mailing?

Wally,

It's pretty "long-winded" to post here.
But I'll try.

Extraction of Data Using RBMware

1- Open the Database Utility Program
2- OK copy/move
3- On the left half of the screen you should see a database name, click the plus to the left of the Dbase name
4- Click the plus on the left of the word “station list” which should be under the database name YOURS MAY SHOW SOME OTHER NAME LIKE “AREA” All of your names may be different than mine, but that doesn’t matter as long as you follow these steps (I HOPE.) ( smile)
5- Click the plus on the left of the station name that contains the data we need showing under the “station list”
6- Click the plus on the left of the “machine list” located under the station name
7- High light the name of the machine that contains the data
8- Click the “file” word at the top of the screen on the left and choose “NEW FILE”
9- You should see a window with 2 boxes, one saying local host if your system is a stand alone and the lower box blank for you to type in a name for the new database. Example: emailtoralph.rbm
10- OK this.
11- You should then see a screen wanting you to choose what RBMview file to associate with the new database, here type in a name example: toralph.mdb and then you choose the “CREATE NEW” option and then confirm
12- You should see a new window with the new database name
13- Go to the top of the screen and click “window” and then “tile horizontal”
14- Click and drag and drop the machine you high lighted in step 7 to the “area list” or station list, whichever is the name shown, of the new database
15- You should see a screen with 4 options, Structure, set, data, and external file options
16- Leave structure options set at whatever comes up on default DO NOT CLICK OK UNTIL ALL 4 TABS HAVE BEEN LOOKED AT AND SET
17- Click the data tab and check all 8 of the same boxes over the fields and set all dates to include data you want to transfer, for say, the last 4 months (if it isn’t an awful huge amount, say 100 data sets per point).
18- At the bottom, leave the statistics at ignore
19- Click the “Set” tab and leave as is
20- Click OK. If you get a message that says “no rbmview data can be transfered” click “yes” to continue
21- The transfer should take place now
22- After finished, go back to Plotdata and see if the data is where it should be
23- If not, email me. If it’s OK, then send me the toralph.rbm file and the toralph.mdb file
24- If the file is too big, say over 4 meg, you may have to redo and choose a different start date
25- Good Luck.

Well I opened up the bearing and took a look at one of there breaks today everything was as it should be, pulled the data that you guys were asking for and it seems to have pulled it's head back in, physical impacting noise heard thru the headphones is gone, Peakvue isn't showing the repetitive impacting that was there, Hmm where do I go from here, it physically sounded bad thru the headphones, data seemed to be telling me there was the start of looseness, but now it's gone? I'd say it was the amount of imbalance but the 2nd and 3rd spectrums down on the trend had the most definite impacting going on along with the noise to accompany it. Watch and see I guess. What would you do??

4096 waveform
Is there a way to attach multiple attachments on the same post with out starting a separate tread and doing an album?

Trend data, note the up and down of the 1x as I mentioned in the above post. Noise and Peakvue don't seem to follow as I would think the higher the 1x the more defined the impacting would be. But impacting appears to be gone in the Peakvue going back to mostly random noise

Ralph - I'll try the database Monday if things go good. We had the a guest that kept us kind of busy this morning

Ralph, I tried your e-mail several times with the attachment and without and it kept bouncing back.
I think what I was seeing was possibly a nick on the wheel caused buy a saw being knocked off the wheel a couple days before I took readings on it.

Thanks a bunch for all of your input,
Wally K

Wally wrote:

quote:

Well I opened up the bearing

I don't understand. Was the bearing replaced and dissected or did you mean something else?
Thx

Wally, in case the question wasn't answered, an inner race crack will show up as a "non" synchronous peak in most cases. The time waveform will show a series of non-synchronous events spaced by 1x rpm as the crack passes through the load zone. It shows up very nicely in gSE TW or in your case Peakvue. Transient vibration can be a real headache. Did you use your strobe to look at the blade?