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  1. #16
    Join Date
    Sep 2004
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    Dardanup W.A.
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    72
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    331

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    Quote Originally Posted by clear out View Post
    I haven’t personally tried this but I’ve read on this or the wood forum that a Forstner bit will drill Al.
    Use kero for lube.
    H.
    The sawtooth edge variety would probably work well in Ali.

  2. #17
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

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    Rough it out with a jigsaw and then true it up with a boring bar

  3. #18
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
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    7,182

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    Quote Originally Posted by ptrott View Post
    The sawtooth edge variety would probably work well in Ali.
    I use a regular (not sawtooth) Forstner bit often on Al as it generates a REALLY NCE FINISH. It works easily enough up till about 25 mm diameter bits but above that it gets harder. A 50 mm Forstner requires the lowest gear on my 1.5HP DP. The swarf is really cute and curly.

    Today I bored holes between 62 and 72 mm in diameter though two layers of 5mm Al with a 5 mm Nitrile rubber layer in between the two Al layers.
    One of the Al layers was a ~200 x 150 while the other Al layer and the rubber was 100 x 100 mm with all 3 required to be concentric to the middle.
    All 3 layers were held concentric using M6 cap screws, one screw in the centre and 4 around the outside of the 100 mm Al pice., thru the rubber and into the 150 x 200 mm piece.

    The large piece just fit and turned in the lathe 4 Jaw after I removed a small section off each corner. I used a parting tool and made stepped cuts at around the 60 mm diamanté's mark and then used a boring bare thereafter to turn all 3 layers to size.

    I'll post some pics when I finish making my latest doodad.

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