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Jame try the skf forum, reliability magazine forum, vibration institute forum,DLI machine condition monitoring plenty of very good information mike

Many thanks mcdm

a bit off track but Venditori de oleum-vipera non vigere excordis populi for months now i have been trying to find out what the above means can anyone help?

Be careful loosing the motor field can be dangerous The three main types of DC motors are: Permanent Magnet, Shunt wound, and Series wound. Permanent Magnet These motors have a permanent magnet which generates a magnetic field. Rotating in this field is the armature through which current is...

Hi all I overheard two electrical winders discussing NS motors when I asked them what the NS meant they simply said they were named NS after the person who designed them. Who or what is NS?

I’m just curios is your machine running at 50Hz/3000cpm?

just curios your machine isn't running at 5oHz/3000cpm is it?

i have heard that because of the explosive nature in some paint and oil plants, some tools i.e. spanners are made of phosphor bronze can anyone offer advice on where i can get any information? best regards mcdm

try this link www.euro-bearings.com/AVindex.htm or www.fansystems.co.uk/AVMounts.htm regards mike.cooney@dowdingandmills.com

hello michelle. our fitters thought it was a cracked shaft or maybe a loose commutator. the motor was run at 1500rpm/25hz no load conditions.there is no previous spectra. the spectra shows multiple harmonics of 2x 3x 4x high 5x line frequency,possible electrical problem?i am going to run the...

hello all what spectra would you expect to get if a dc drive motor had a broken or cracked shaft regards mike cooney

many thanks for your help I have received many emails on this subject it will take me a while to sort through them Regards mike

What collection specification settings do I need when collecting time waveform, i.e. velocity mm/sec rms, acceleration g rms or displacement um rms. (iso apply as I am in the uk) Is it as simple as; when collecting data and I find a potential problem in a spectrum, should I apply the...

thanks greg Valid points, as soon as I can I am going to set up a test rig and compare data levels between a data collector and a portable balancing kit. I will set the data collector in balance mode copying the portable balancers parameter settings. the figures quoted in my question were...

Recently I flagged up a fan unit for balancing Motor 01 h = 3.7 mm/sec rms Motor 01 v = 2.8 mm/sec rms Motor 02 h = 5.7 mm/sec rms Motor 02 v = 5.4 mm/sec rms Motor 02 a =1.2 mm/sec rms Fan 03 h = 7mm/sec rms Fan 03 v = 5.1mm/sec rms Fan 04 h = 7.2mm/sec rms Fan 04 v = 8.1mm/sec rms All the...

Hi Paul technical associates of charlotte diagnostic charts suggest that mechanical looseness can often cause sub harmonics at 1/2 0r1/3rpm some diagnostic charts may suggest oil whirl this can occur at 39%-40%. so depending on your data collection resolution this may be the case. you could try...

Hi nisqually i am using the commtest vb2000t kit and found help with phase @ universal technologies inc. interpreting unbalance/misalignment using relative motoion diagrams any problems ill try to help

is the unit mounted on anti vibration mounts i have had many cases where where the drive motor has been running at 10-15mm/sec(mainly vertical and axial planes ) and the fan bearings have been no more than 4-5mm/sec after further investigation i found that some of the av mounts were worn. i...

i am currently using the vb200t and mas operating system. the data collection time/software and technical support are execellent

many thanks electricpete this information is a very useful regards mcdm