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Creating a 12cm Diameter Hole in a 40cm Tree Log: Methods and Techniques?

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How can I drill a through-hole about 12 cm in diameter through a tree log that is about 40 cm thick?

Use a self-feed drill/auger bit; one reply points to a large Milwaukee self-feed bit of 117 mm, which is close to the 120 mm you need [#16585835] For a hole that deep, you may also need an extension on the bit [#16585934] If you cannot find a bit large enough, another option is a hole saw and then gouging/chiselling out the cut material, or making a homemade drill, but an ordinary drill may struggle with such a large diameter and depth [#16585852][#16586396]
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  • #1 16585677
    Anonymous
    Level 1  
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  • #2 16585702
    bearq
    Level 39  
    Posts: 4883
    Help: 414
    Rate: 1610
    Enter the length of the log.
  • #3 16585709
    REMUR.
    Level 27  
    Posts: 599
    Help: 143
    Rate: 254
    I didn't even know such tools existed Link , Link
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  • #5 16585766
    Anonymous
    Level 1  
  • #7 16585852
    WędkarzStoLica
    Level 31  
    Posts: 1511
    Help: 146
    Rate: 300
    With this diameter it can be hard or even impossible to get.
    Either a hole saw and gouging out what's cut or a homemade drill.

    Once I had the task of making a shelf for flower pots in a log cut lengthwise :D
    I made the drill myself from a rod and a piece of spring - somehow it went there, but for you it will be more difficult because the hole is much deeper.

    Hard / soft wood? The opening must be precise? In the sense that ideally on the axis?
  • #8 16585889
    REMUR.
    Level 27  
    Posts: 599
    Help: 143
    Rate: 254
    Set Link Link
    WędkarzStoLica wrote:
    and picking out what is cut

    But how does this translate into the price of the hole.
  • #9 16585896
    WędkarzStoLica
    Level 31  
    Posts: 1511
    Help: 146
    Rate: 300
    REMUR. wrote:
    But how does this translate into the price of the hole.
    I don't understand what are you drinking for? What you gave is what I just mentioned :D You'll have to pick it too, because you won't get it right through.
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  • #10 16585934
    REMUR.
    Level 27  
    Posts: 599
    Help: 143
    Rate: 254
    With the chisel you choose what is cut and continue drilling.
    You want it at once Link
    In both cases, it may be necessary to add an extension.
  • #11 16586396
    bearq
    Level 39  
    Posts: 4883
    Help: 414
    Rate: 1610
    There is still too little information about exactly what it is. If the unit and time job is the correct drill bit, hole next to the hole and knock out plugs. There may be a problem with a cutter or hole saw because we cannot drive such a diameter with an ordinary drill
  • #12 16586489
    TheKamil
    Level 14  
    Posts: 178
    Help: 2
    Rate: 4
    For what purpose is this hole to be drilled? If it doesn't have to be perfect, you can burn out :D
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Topic summary

✨ The discussion revolves around methods to create a 12cm diameter hole through a 40cm tree log. Various suggestions include using adjustable diameter drill bits, self-feed drills, and hole saws. Some participants mention the difficulty of finding suitable tools for such a large diameter and depth, with recommendations for homemade solutions and chiseling techniques. The need for precision and the type of wood (hard or soft) are also considered important factors. One participant humorously suggests burning out the hole if perfection is not required. The topic concludes with the original poster expressing gratitude for the advice received.
Summary generated by AI based on the discussion content.
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