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A holder for my 16mm solid carbide boring bar.

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  • A holder for my 16mm solid carbide boring bar.

    The Teknik 16mm bar that I bought has only got a flat on the top. So simple shimming to hold it in the toolpost won't do. I made a holder for the bar which only fits in the larger toolpost that can be attached directly to the cross slide in place of the compound. The tool height is set at plus 0.008" and as the shank is brittle compared to steel, there is a steel pad between the bar and the screws. Tha pad also serves to keep the bar aligned.

    Click image for larger version

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  • #2
    Now that is sexy.
    I like the pressure key.

    -D
    DZER

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    • #3
      Somebody might notice that the handle of the toolpost is pointing the wrong way. I corrected that accidentally, when I wanted to modify the toolpost today. That meant removing it from the cast iron base, and when I bolted it back on, I had inadvertantly set it 90 degrees clockwise from its original position.
      That hole in the block is 100mm long, too deep to bore, so I drilled it 5/8" and put a 16mm reamer through to make sure the hole was straight, it only took a tiny bit of metal out, the drill must have cut within 0.0005" of 16mm.
      That bar should manage 96mm deep holes starting at 20mm diameter.
      Last edited by old mart; 05-28-2021, 02:35 PM.

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