Does any body know or have any experience with wire drawing equipment as far as vibration frequencies caused by the slippage of copper going a crossed ceramic rolls . And these rolls are running in synthetic dip .Some of these machines have quite high acceleration 4.0 g's and spike energy 6.0 gse but very low velocity .08 ips . Most of these are in the mid to high cpm around 80000 and up but show a raised floor through out the spectrum . Any ideas or commits would be appreciated.

What is the objective of your vibration measurements; roll wear, bearing faults, wire drawing quality or something else? Where did you make the measurements? Are the measurements for diagnostics, part of a routine walk-around survey or online monitor?

Walt

Looking for bearing wear and gear problems.
they were taken on bearing houseings as part of a walk around .
They seam too change weekly when readings are taken .

I would consider increasing the number of averages (possibly 32) to smooth out random variations in measurement. The high frequency vibrations can be from friction (slip) or impacting of wire on roll or can be transmitted along wire wire from another location. You may have to accept the higher background vibrations and try to take surveys during stable and similar (speed and tension) process conditions. Concentrate on bearing and gear fault frequencies and be careful about getting too excited about HFD or Spike Energy acceleraton measurements.

Walt

I did just that by running the machine with no wire and all vibration readings went down .
So Walt how much overlap would you use on 32 averages . I have come too the conclution that the amount of lube content in the dip is a very big factor in how high these readings can go.

Speedy,

A 50% overlap on data samples should be fine when using a high number of averages. The number of averages or degrees of freedom affect the statistical accuracy of measuring random signals. If the process changes, such as friction from lube in the dip, then the measured spectrum will probably change. I think that you want consistent measurements so you can tell whether a vibration change was due to a process (lube, tension, etc.) change or a degradation in machine condition (bearings, gears, etc.).

Walt