[Jewelry making - Article 00283] - Re: [Orchid] Broken drill bits remover

[Peter W . Rowe]

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>     Surprised that sodium bisulfate will attack carbide, I will file
>     that one away for future use, Thanks Peter 

    So was I. It was one of those surplus industrial drills. Short
    little 1/8 inch shank with a tip more like a tiny milling cutter, but
    a drill nevertheless, probably for circuit boards. I'd bought a box
    of a bunch of them, resharpened industrial surplus or something from
    Harbor Freight. The thinner ones would break at the mere suggestion
    of abuse. It's always possible they weren't standard carbide, though
    I don't know exactly what that might be. Harder than HSS at any rate.
    And wouldn't you know it, I was dumb enough to be using them on
    platinum, thinking they'd last longer or something. When one broke
    off, and I couldn't mechanically drive out the broken tip, I tried
    the pickle as a last resort, and though slow, it worked. I can't say
    I've got lots of experience taking carbide bits out. Just that one.
    But it did work that time. "Your mileage may vary..." 

Peter
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