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  1. 27-07-2008 #11
    irving2008's Avatar
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    Quote Originally Posted by irving2008 View Post
    Robin,

    Its an interesting point. a centre support will reduce the deflection but as we already know thats tiny. But I hadn't considered the resonance aspect. I'll do some calcs to find the resonant freq of the bar and see if theres any issue.

    Irving...
    Well the natural, undamped frequency for a single rail is roughly 287Hz so I'm not sure theres any issue here - all the possible drivers forcing oscillation are at at a considerably lower frequency (min cutter speed 2800rpm - 46rps) so the damping coefficients for forced excitation are large. Also with the two pillow blocks attached there is a significant damping coefficient. There may just be issues with a combination of cutter speed at 17000 rpm (single flute), 8500 rpm (2 flute) or (4250rpm (4 flute) and/or stepping rate of 172mm/min. (Its years since I did any of this stuff at college... makes my brain hurt just reading the equations!)

    Of course the proof will be in the actual result...
    Last edited by irving2008; 27-07-2008 at 05:26 PM.
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