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  1. #1
    bronto48 is offline Hot Rolled
    Join Date
    Apr 2006
    Location
    Laytonsville, Maryland
    Posts
    532

    Default How do you drill chrome plated item?

    I am trying to drill small holes (11/32 inch) in chrome plated steel stampings. Using standard 118 degree point, HSS drills, I find that even with slow (225 RPM) spindle speeds that drill life is only about two holes. Hard to believe that chrome plating can be so destructive to the drill.

    Should I be using carbide drills or some other technique?

    Thanks in advance for any tips.

  2. #2
    altered is offline Aluminum
    Join Date
    Apr 2007
    Location
    Qc, Canada
    Posts
    113

    Default

    You can use a concret drill(the point is carbide) and sharpen it like a twist drill or use a carbide drill.

    Chrome is really hard.

  3. #3
    metlmunchr is offline Diamond
    Join Date
    Jul 2004
    Location
    Asheville NC USA
    Posts
    8,341

    Default

    I'd check the hardness of the material itself. I've drilled lots of holes thru hard chromed shafting, and it generally drills like the chrome isn't even there, unless the shaft happens to be one of those that's induction cased prior to plating. Those are kinda tough on drills, especially when you aren't expecting it

  4. #4
    CalG is offline Titanium
    Join Date
    Dec 2008
    Location
    Vt USA
    Posts
    3,738

    Default

    Hit the "to be drilled spot" with a mounted point powered by your die grinder till the substrate shows through. ;-P

  5. #5
    rons is offline Stainless
    Join Date
    Mar 2009
    Location
    San Jose, CA. USA
    Posts
    1,398

    Default

    CalG is right. You can also use a Dremel tool with a diamond point bit just to
    break the surface.

  6. #6
    stannp368 is offline Hot Rolled
    Join Date
    Jan 2003
    Location
    Philadelphia, PA USA
    Posts
    617

    Default Drilling through chrome plating

    First off, chrome plating is thin. You should use a solid carbide drill of 1/4 dia then follow through w/ carbide reamers until you finish the hole. 11/32 drill in sheet metal won't give you a decent hole

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