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Thread: Long boring D bit

  1. #1
    Supporting Member Christophe Mineau's Avatar
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    Christophe Mineau's Tools

    Long boring D bit

    Here is another use case of my hand chuck, it is for holding a long boring D bit



    Here is how the D bit is made : it's a piece of HSS round stock, ground to shape, that is silver brazed to a rod of standard steel. The tip has a D shape section, that is to say it is ground just above the diameter line. The tip is also ground at a maybe 30 angle, if you look at it from the top :



    Here it is in use on the lathe, through the tail stock, hold by hand with my hand chuck.

    You need a steady rest and you need to drill first a guiding hole in order to drive the D bit at the begining.
    The progress is quite slow, you need to be patient. You push for maybe 5 to 10mm, sometimes less, and you remove the bit to clean up the chips that strick together on the flat section of the bit.
    I frequently soak the bit in a bottle of lin seed oil in order to lubricate.



    And here is the result, through a 40cm long piece of cherry. This is the output end, you can see that I am only maybe 5 mm off center, which is a quite good result.
    No need to say that with a twist bit, this result is nearly impossible, you woold be way more off center.



    The piece is then trued up between centers on the lathe.
    Last edited by Christophe Mineau; 08-04-2015 at 06:21 AM.
    Cheers !
    Christophe
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  2. The Following 7 Users Say Thank You to Christophe Mineau For This Useful Post:

    Andyt (06-19-2019), CedarSlayer (12-02-2014), Doc (12-03-2014), high-side (06-18-2019), JD62 (03-25-2017), kbalch (12-02-2014), Paul Jones (01-03-2015)

  3. #2
    kbalch's Avatar
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    Thanks Christophe! I've added your Boring Bit to our Wood Lathes category, as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:


  4. #3
    Supporting Member Hotz's Avatar
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    Hotz's Tools
    interesting tool.
    Sorry my mistakes in english.
    to share your tip >>> http://www.homemadetools.net/forum/tool-tips-tricks/ <<<

  5. #4
    Doc
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    Doc's Tools
    Very useful tool

    Doc

  6. #5
    Content Editor
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    Haven't seen an application like this before. Needless to say, I found it quite interesting.


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