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  1. AX3L

    What are the Core Engineering Skills?

    I'd say mechanics is a pretty important topic. Same goes with som basic electrical skills, some software engineering skills even if that might be harder to explain in just a slide. But most of all, I think the main skill of an engineer is to break down huge problems into small parts to be able...
  2. AX3L

    Social skills, interpersonal skills etc. for engineers

    I like to see chatting and small talk as a game of table-tennis with your young child. It's not about winning or losing, or you showing of how good a player you are and keeping the ball all the time, it's about bouncing the ball back and forth so that you both enjoy the game. This might be a...
  3. AX3L

    Good mobile apps for engineers?

    I'm stunned to see that in 20+ posts not one has mentioned Wolfram Alpha? Sure, one might not have to get the actual app, but it's a bit easier than to use the web browser in the phone. If you haven't came across Wolfram before it's like an "engineers google" that will calculate, convert, plot...
  4. AX3L

    Vibration analysis using wavelet transform

    Thanks Greg, it would be very appreciated!
  5. AX3L

    Vibration analysis using wavelet transform

    amanuensis, I'm not entirely sure what you mean by looking at the time-history signal and what means by default and to amplify that. If you could please explain the steps a bit more in detail it would be very helpful! Or are wavelet uneccesarry complicated? The problem I have are large and...
  6. AX3L

    Vibration analysis using wavelet transform

    Thanks for the answer Greg, informative as usual! Tricky it is for sure, and it doesn't get easier since you need different wavelets for different applications. But maybe identifying the fault isn't the right approach here, maybe it's better to find just that something is wrong and then use...
  7. AX3L

    Vibration analysis using wavelet transform

    Electricpete: Thanks for the hint, but I've done some serious research for quite some time now without any real success so far. The thing is, that there's a lot of papers of this topic showing that wavelet is able to detect faults and showing different kinds of wavelet plots for different...
  8. AX3L

    Vibration analysis using wavelet transform

    Hi everyone! I'm making a system that will detect all different kinds of fault on different machinery like bearing, misalignment etc. I understand the concept on wavelet transforms and its advantages over the regular FFT for these kind of signals but I can't see how to compare and analyse the...
  9. AX3L

    Measure tool wear using vibration or cutting force measurement?

    Zinov and Viktor: Thank you both for your answers! I now realize vibration analysis for tool measurements at least for ordinary machines isn't worth doing. I would like to try it sometimes though, mostly to see if it's possible, but for now I'll concentrate at the bearing fault detection.
  10. AX3L

    Measure tool wear using vibration or cutting force measurement?

    Zinov: Portable analyse equipment is something we have a lot of already. And while they're accurate and all, they obviously require some manual handling for the measurements and since we have many machines to be monitored we can't do it as often as I would like to in order to see trends and find...
  11. AX3L

    Measure tool wear using vibration or cutting force measurement?

    Orneynorsk: That's the plan, I'm thinking of placing the accelerometer(s) at the tool holder itself (I'm now referring to turning operations) and analyse it using FFT and wavlet transform in some Matlab and Simulink script at the computers next to the machines. This way, one should easily be...
  12. AX3L

    Software packages for vibrational transfer function evaluation?

    LabView from National Instruments is a great software for signal processing like FFT. It works well with their DAQs obviously and that seems to me like a good combo if you haven't that equipment already. MatLab and Simulink is my software of choice, but it's really expensive if you don't have it...
  13. AX3L

    Measure tool wear using vibration or cutting force measurement?

    Orneynorsk: Thanks a lot for your answer! That's a bit different answer than what I expected though. To me it seems like vibration analysis would be more accurate but maybe there's a reason why tool wear is measured using force and not vibrations. While where at it, we have some problems with...
  14. AX3L

    Measure tool wear using vibration or cutting force measurement?

    Hi everyone! I'm looking to introduce a system for fault detection in bearings and misalignments using vibration analysis (thanks for all the help with that in the vibration forum, by the way!). I found out that using the same equipment (a DAQ - Data Acquisition unit) one can measure tool wear...
  15. AX3L

    Manual vs automated fault detection by vibration

    Optical is what we're using now when we check manually so I guess too that's an alternative. I can't see how it will work over time with all the fluids and/or dust in the machines though. Another alterative is of course to solve this using algorithms instead. We usually run 400-500 parts of each...
  16. AX3L

    Manual vs automated fault detection by vibration

    Greg: I see! Well I must admit I haven't checked it out in detail since I know others have similar solutions that work. But the three "claws" holding the piece in the chuck of the turning machine seems possible to sense in some way. Or have you already tried that?
  17. AX3L

    Manual vs automated fault detection by vibration

    Greg: What an inductive sensor do is measuring the magnetic field (and by that distance) to a metallic object. If you place it where you have say two bolts or any other "defect" to the plane surface on the spindle, you'll get two dramatical changes or pulses per revolution and combined with time...
  18. AX3L

    Manual vs automated fault detection by vibration

    ivymike: Of course you're absolutely right about the man been the best fault detector there is. And many faults are indeed detected that way even in our company. But there are a few problems, many of them being related to the mentality of the operators of the machines. When the service...
  19. AX3L

    Measure the pinions of a truck

    Mike: For the tolerances, the lower the error the better of course. Ideal would be 1 micro meter, I assume that's not possible but it have to be at least in that area. The mechanical measurement you're talking about is about the same we use now and it works when we measure only every 10 piece...
  20. AX3L

    Measure the pinions of a truck

    Hi guys! I've been given the project to automate the process of measuring the pinions and do it by the line rather than in a separate room. That is, measuring all the diameters, some lengths and the cogs themselves. The cogs are the difficult part where every cog is turned and convex. Today...

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