unbalacing without phase probe
unbalacing without phase probe
(OP)
Does someone know a method or mathematica formula to balance a shaft without using a phase probe ...but just trial masses?
Many thanks !
Molossi74
Many thanks !
Molossi74





RE: unbalacing without phase probe
Sorry, I cannot explain how to do it, it sucks. Nobody would do it that way in the real world. If I really had to, I'd use trial and error.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: unbalacing without phase probe
You then use a little geometry to determine the amplitude and size of the required correction weight. Do a google search for details.
However, as mentioned, this is a really poor way of approaching a machine balance. Setting up a tacho/phase reference pulse makes things so much easier: you can reduce the number of runs required to obtain a balance and with a minimal understanding of rotor dynamics you can get a reasonably good estimate of where the correction weight should go. This is important if you are working on a badly balanced machine - a trial and erro approach could result in placement of the trial weight on the existing heavy spot making a bad situation even worse.
It is easy to make errors when balancing - by using 1X amplitude and phase obtained from a tacho/phase reference, you can work backwards to figure out what is going wrong and try to correct things.
RE: unbalacing without phase probe
A method was posted by William Foiles here in the last year.
http://m
www.spintelligentlabs.com/SL-docs/4runtutorial.pdf
RE: unbalacing without phase probe
For cooling tower fans, or fin fans, the 4 run method works really well, and is still often used, as it reduces the influence of other operating cells in the tower.
-The future's so bright I gotta wear shades!
RE: unbalacing without phase probe
Dave G.
www.ReliabilityDirectStore.com
RE: unbalacing without phase probe
RE: unbalacing without phase probe
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: unbalacing without phase probe
RE: unbalacing without phase probe
This can be found in the proceedings of that meeting.
Regards,
Bill