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  1. #1
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
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    59
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    6,540

    Default How would you make this?

    One of the guys at work brought this in today (to taunt me I'm sure...)
    IMG_0783 (Medium).JPG
    We think it is a watch maker's drill - the drill bit is sub 1mm. The shaft looks to be a 8 or 10 start with a helix angle of 60 degrees. The thing that has me puzzled though is how the nut would be made. Any ideas?

    Michael

  2. #2
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    maybe a broach ?

  3. #3
    Join Date
    Aug 2007
    Location
    Saskatoon, Saskatchewan, Canada
    Posts
    292

    Default

    They are called Archimedes drills and are for any small work like watchmaking (good guess ), model making and jewelry making. They can be bought quite inexpensively.

    Pete

  4. #4
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    39
    Posts
    4,515

    Default

    I would say cast.....just to throw another idea out there.....but broaching as John said could work very well.
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  5. #5
    Join Date
    Dec 2011
    Location
    Lancaster, Ohio, USA
    Posts
    100

    Default

    Uniform twist not needing any great amount of precision could mean it was just twisted, possibly heated up. Gun barrels are rifled, this is not much different.

  6. #6
    Join Date
    Oct 2006
    Location
    Tallahassee FL USA
    Age
    82
    Posts
    372

    Default Lost Wax?

    Maybe:

    Clone the quasi-allthread in plaster of Paris for a waste core. Setting expansion of the p-o-P provides clearance. Mold the body thereon in wax. Proceed as in lost wax process.

    Cheers,
    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain

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