Does anyone have a chart web site of obits and what each represent? Thank you for your input
Regards
Don

Sorry I forgot the r in Orbits

Yea, that's a killer mistake.

I would respond, but I've got to finish a post-mortem.

That's dead easy.....

Picked up a machine fault yesterday, bearing was in lots obits....

I think this joke has almost expired. Enough beating a dead horse!

http://imd.us/pdfs/shaft-orbits.pdf

Also take a look around the Orbit archives:
http://www.bently.com/orbit.htm

Excellent. Thanks for the information.

Thank you Pete
Regards
Don

the most coomnon measurement display used for the analysis of ladrge tubines is the orbit display.
2 transducer probes are installed at 90 degree from one onother , and the 2 signals are pltted in X and Y format . the orbit indicates the movement of the center of the shaft within the jurnal bearing.
imbalance will generate a circular orbit. if the vertiacl and horizontal stiffness are equal you would get a perfic circle. in most cases the orbit will be silghtly elliptical.
misalignment will cause the orbit display to be more eliptical in shape. the phase change and
2X frequency will cause the elliptical shape.

oil whirl cause loops withen the large loop will appear to move around the orbit.
l

looseness will generate a second loop remain stationary.


i hope that i coould help you

best regards

hello in my above poste in mean 2 aproximity probes not 2 transducer probes .....perfict circle ..



thanks

Here is an app note that may be of assistance:
http://www.reliabilitydirect.com/appnotes/jbfail.html

An oldie that has some interesting orbits is

Title:
Dynamic Stability of Rotor-Bearing Systems. NASA SP-113
Authors:
Gunter, Edgar J., Jr.
Publication:
Dynamic Stability of Rotor-Bearing Systems. NASA SP-113, by Gunter, Edgar J., Jr., 228 pages, published by NASA, Washington, D.C., 1966
Publication Date:
00/1966


I found a used copy on the internet a few years ago.