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Thread: LFV - Low Frequency Vibration

  1. #1
    Supporting Member machining 4 all's Avatar
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    machining 4 all's Tools

    LFV - Low Frequency Vibration


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    nova_robotics's Tools
    Is this for breaking chips?

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    Supporting Member machining 4 all's Avatar
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    machining 4 all's Tools
    Exactly! It is an unconventional machining process used to break chips in ductile materials (low carbon steels, for example). It also shows good results in the machining of polymers, pure aluminum and some alloys used in the naval, aeronautical and aerospace industries. Depending on the specific model of the equipment, different types of vibration are obtained (see image).



    LFV - Low Frequency Vibration-lfv.jpg
    Last edited by machining 4 all; Mar 22, 2021 at 05:42 PM.

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    nova_robotics (Mar 22, 2021), that_other_guy (Mar 29, 2021)

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    nova_robotics's Tools
    That's interesting. I have ****ty tools and use them poorly so they chatter all over the place. Basically the same thing. I'm a trend setter.

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    Supporting Member hemmjo's Avatar
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    It seems to me that a similar thing happens on a regular old lathe. The natural vibrations of the tool and work piece create differences in cut depth. Especially in roughing cuts, then when a finish cut is made, the vibrations would be different, resulting in a nicer finish.

    The cut off tool is especially prone to vibrations, and failure do to excessive vibration.

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    Supporting Member machining 4 all's Avatar
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    machining 4 all's Tools
    That's it, there are materials that don't break chip easily, even if you change the machining parameters or use chip breaking tools. The fun is trying to control the shape of the chip, when possible, so as not to end up with a bird's nest on top of the machine!

    LFV - Low Frequency Vibration-chips.jpg

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    Supporting Member machining 4 all's Avatar
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    machining 4 all's Tools
    Yes hemmjo, there is also a relationship between the depth of machining, the tool nose radius and the rigidity of the equipment. When the cutting edge of the tool is worn or broken, the tendency to cut is vibrating and noisy, which is very irritating. If the machine has excessive play, then the tool makes small bumps and may even break. The secret of the process is to know how to choose and sharpen the tool correctly!

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    Supporting Member hemmjo's Avatar
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    So are these Low Frequency Vibrations something that are created on purpose? Or is the animation a demonstration of how the unwanted but often naturally occurring vibrations affect the machining process?

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    machining 4 all's Tools
    Yes, they are vibrations controlled by the machine! They are usually 1.5 times greater than the frequency of the part.

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    Supporting Member Frank S's Avatar
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    Quote Originally Posted by hemmjo View Post
    So are these Low Frequency Vibrations something that are created on purpose? Or is the animation a demonstration of how the unwanted but often naturally occurring vibrations affect the machining process?
    yes they are purposely created. in the case of the deep bore in the video it would be next to impossible to plunge straight in without reversing out due to chip fouling
    Never try to tell me it can't be done
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