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Thread: Quick project (hopefully)

  1. #1

    Quick project (hopefully)

    Havent had much shed time this year so am doing a quick holiday project.









    Donk
    Needs must while the devil rides.

  2. #2
    Senior Member Tobho Mott's Avatar
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    That is a very nice looking shiny and kinda pointy thing! Since you painted the part that was held in the lathe, I assume that is a core print, not something to saw off later...

    I love pictures of new patterns.

    So what's it for?

    Jeff
    Tobho had learned to work Valyrian steel at the forges of Qohor as a boy. Only a man who knew the spells could take old weapons and forge them anew.

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  3. #3
    No core in this one, it just gets cast solid

    Donk
    Needs must while the devil rides.

  4. #4
    Senior Member r4z0r7o3's Avatar
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    I'm curious, when you split something like that, do account for the material removed by sawing? Or does the line just get blended at the parting and get filed/polished off later?
    "Things that are complex are not useful, things that are useful are simple."
    - Mikhail Kalashnikov

  5. #5
    Saw it first then glue it back together with a thin piece of paper in the join then turn it.
    Splits on the paper no loss.

    Donk
    Needs must while the devil rides.

  6. #6
    Quote Originally Posted by donkey View Post
    Saw it first then glue it back together with a thin piece of paper in the join then turn it.
    Splits on the paper no loss.

    Donk
    AHHHSOOO... Ancient chinese secret eh? I always wondered how swarf loss is accounted for. Learn something new everyday. SLICK!
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  7. #7
    Senior Member r4z0r7o3's Avatar
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    Yep, I've done this trick before. I used tissue-paper and 50:50 glue/water. Works great though...do you try to accurately gauge how much paper is needed to match the saw kerf?

    In the composites world, one trick that's done, is making a kind of fixture which exactly registers/matches the original (whole) model and secures each side rigidly in a framework (that can be disassembled). You then remove the part, and saw it in half. Next, the cut-face on half the pattern is covered in release (packing tape works great). Finally, both halves are re-installed into the fixture, and the kerf-gap is pumped full of epoxy filler. When cured, remove from the fixture and voila, the halves separate and the kerf is perfectly filled all around (w/in 5-10 thou or so).

    I think maybe with sand-casting, the surface finish is such that this level of accuracy is unnecessary. You can post-process/machine (file, sand, polish) the part which isn't (so much) possible with composites. Does this sound like a reasonable understanding?

    (obviously, different parts for different purposes, maybe finish isn't critical at all, maybe it is)
    "Things that are complex are not useful, things that are useful are simple."
    - Mikhail Kalashnikov

  8. #8
    Thickness of the saw kerf is irrelevant as it is cut and rejoined before shaping.

    Donk
    Needs must while the devil rides.

  9. #9
    A finial of some sort maybe, or lightning conductor?

  10. #10
    Senior Member r4z0r7o3's Avatar
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    Quote Originally Posted by donkey View Post
    Thickness of the saw kerf is irrelevant as it is cut and rejoined before shaping.

    Donk
    Oooohhh, I C it now, totally missed that from the pics. Thanks.
    "Things that are complex are not useful, things that are useful are simple."
    - Mikhail Kalashnikov

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