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Ideal type bits for PCB drilling??

Discussion in 'Electronic Basics' started by royalmp2001, Jul 5, 2005.

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  1. royalmp2001

    royalmp2001 Guest

    Hi,
    I drill pcbs on a daily basis and am getting fed up with brittle
    carbides that break too easily, particularly the very small sizes.

    I read on someone's site to use dental ball burs...has anyone else used
    them. Do I need diamond, carbide or steel burs?

    Are high speed steel bits really no good as they wear out quickly on
    fiberglass epoxy boards?

    Thanks
     
  2. John Larkin

    John Larkin Guest

    Cheap hss steel will wear out fairly quickly, hundreds of holes maybe,
    but then they're cheap! You need an air-bearing, servo-feed, 100,000
    RPM drill to use carbides right.

    John
     
  3. Rich Webb

    Rich Webb Guest

    The smaller "de-burring" bits (not sure of the correct identification,
    they're the ones with the very small fluted cutting ball) work well for
    me -- although I certainly don't go through anything like the number of
    holes you do. There's not a lot of cutting edges, though, so they will
    wear quickly.

    One bennie of the spherical bits seems to be a forgiving nature with
    respect to off-axis force.
     
  4. Bob Masta

    Bob Masta Guest

    I use carbide dental burs. These have a fluted carbide ball
    on a steel shank. I have never had one break, though if you
    drop your Dremel and it lands on the bur, you can bend the
    shank. (Voice of experience!) I use them for drilling epoxy
    glass and everything else, and have been using the same
    set for over 20 years. I use them for all sorts of abusive
    side-load things like hogging out slots for transformer
    mounting tabs, etc, with no problems.

    After the first dropped tool and bent shank, I made a
    sleeve from a piece of thinwall conduit sliced down the
    side, which I can slip over the end of the Dremel when
    I'm done drilling to protect the bit, in case the tool gets
    knocked off the bench or something. End of problem.

    More notes on this and simple PCB construction at
    www.daqarta.com/lptxh.htm

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  5. ehsjr

    ehsjr Guest

    Bob,

    Have you found a source for these, other than your dentist?

    Ed
     
  6. Bob Masta

    Bob Masta Guest

    I got mine from a dental supply house, where the dentists
    get theirs. That was many years ago, so I don't even know
    if it is still in town. Your dentist will know what's local for you,
    but I'll bet there are plenty of Web sources these days!

    Best regards,



    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  7. DBLEXPOSURE

    DBLEXPOSURE Guest

    Haven't baught any in a while but I belive they are callerd jeweler's bits
     
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