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  1. #1

    Join Date
    Jan 2022
    Posts
    1

    Running bore bar

    So I'm running a tube of A519. OD of 5.500 and ID of 3.00
    I am having issues with humming and chatter when boring. Boring from 3.00 to 3.480 and 7inch deep. Steel bore bar with negative rake insert cnmg432-tf ic8250.
    Its currently set to run at DOC .120, 200sf and .010ipr. It hums loud and may chatter at times.
    I've had it set to run at DOC .060, 470-520sf and .010-.012ipr. It came out with a shine and made no noise while cutting but didn't last long before serious chatter all the time and broke inserts like crazy.
    Thoughts?

  2. #2
    Registered
    Join Date
    Mar 2015
    Posts
    28

    Re: Running bore bar

    Greetings,

    We used to machine hollow tubes.

    To curtail the vibration, we would wrap a piece of surgical tubing around the part to dampen the harmonics.

    Cheers,

    Dave

  3. #3
    Registered
    Join Date
    Mar 2009
    Posts
    1714

    Re: Running bore bar

    It doesn't look "long" enough to chatter. Check ir your cutting point is not above the rotation axis.

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