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Thread: Question on SCREAMING BIT

  1. #1
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    Dec 2008
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    Default Question on SCREAMING BIT

    I bought some mortise comp centurion bits and tried the first one out today. It cut fine, but the scream/squeal ran me out of the shop. I tried to run faster, slower, changed router rpms and nothing helped. Is this just the nauture of the beast? I have just been running down spiral bits before this and they run quiet.

    Thanks

    Kenneth

  2. #2
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    Kenneth...
    Let me guess... it is a 1/4" bit and you cant go below 12K rpm. Thats where they start the screaming. Can you increase your move speed?
    Gary

  3. #3
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    I took it down to 10k rpm and no change. I sped up the feed speed to 3 ips ( it was at 2 )

    So you are saying I need to push it faster? how much faster?

    There is no sign of burning and I was running some of the same files that were fine with a down spiral bit with the same settings.

    Kenneth

  4. #4
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    Kenneth...
    Not saying I eliminate the noise, but usually cut around 10.5K @ 5-6ips, .700 per pass. Noise is lower and bit stays room temp.
    Gary

  5. #5
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    I had the same experience when cutting some mdf on the climb path of the cut, not sure why it was doing that.

  6. #6
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    I am wondering if the normal compression (non mortise) would do the same?? I am running prefinished ply cabinet parts, but I run the same stuff quietly with the down spiral bits.

    I ran climb .68 deep and finish pass conventional, and it screams on both cuts.

  7. #7
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    Kenneth...
    There have been other posts on the noise of 1/4" comression bits. I dont think its peculiar to the mortise compression or Centurion. The 3/8 make noise too, but mortise comprssions are by far the best tool for cutting PF plywood cabinet parts.

    You can use a normal compression if you are not cutting dados. The standard compression has a higher up spiral section, and can actually cut outlines faster, but chips the surface when cutting shallower than the bottom of the downspiral section. Wear ear protection!

    Gary

  8. #8
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    I have big radio muffs, but this noise still makes me want to use the cabinet saw. lol

  9. #9
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    Kenneth...
    Use the muffs for the saw too! We both know that cutting those panels on the saw would be "just wrong"!
    Gary

  10. #10
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    The cabinet saw is like a whisper compared to the compression bit's SCREAM. I've been "wrong" before, so that doesn't bother me much.
    KR

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