I recommend you to use ISO 10816 Part 3. There is no reason to allow more level on the motor top. The motor does not know where it sits and cannot adjust its wear and tear to allow higher levels. You should demand as delivery status below 2-3 mm/s rms and for an action to be motivated you should...
We use stiffness as a measure of stability of a milling machine. When the tool is located at an extreme position, we try to maximize Newton/micron as measure of stiffness in X/YZ directions at the tool base. What about damping? With newer welded instead of cast stands, damping has grown as an...
Dear mec, butelja has indicated the main aspects. Unbalance means moving of the centre of gravity related to the rotation centre. A these discussions are based on the simple formula = Rotormass times excentricity equal balancemass times radius. (I f you liek to know more check the Standard ISO...
A 60 Hz current has two force peaks or maxima per period. You have 120 such force humps per second. With three phases, there are three rows of peaks nicely split over each second. That sums up to 360 forces per second. Yields 360 Hz. In Europe we suffer from 300 Hz. Some rectifiers have a filter...
The statement that overhung ventilators in specific are more prone to problems than any other fan designs of course reflects that you have been subject to bad designs. Each time you are flying a jetliner today, you are subject to a transport hardly being possible without an overhung rotor. The...
If you need something real basic introductory with pictures rather than formulas, I could mail you our basic .ppt pictures. Some english text, but mostly picture says more than words.<br>You can contact me at <A HREF="mailto:arnespamlind@algonet.se">arnespamlind@algonet.se</A>. Remove spam to...
I think this was a valuable thread showing the effect of resonance. All vibrations is the elementary result of impulse (in this case unbalance) and (actually "times") dynamic response characteristics. Fine, from the beginning this looked like a variable unbalance, and since time aspect...
