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  1. #11

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    1/4 inch Whitworth, and the bigger size is 3/8 inch Whitworth. I really like the idea that even the most advanced digital stuff still uses these obsolete (apart from cameras) threads.

  2. #12

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    You can likely get the inserts, screws, knobs, etc. from your local "real" hardware store.
    Even the big box home centers have the stuff, but hardware stores are more fun, plus you can buy just one instead of a package of 5.

  3. #13
    Nicholas Lindan's Avatar
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    It isn't 1/4" Whitworth... It is 1/4-20 UNC - a US screw thread.

    As for Whitworth http://www.jag-lovers.org/xk-lovers/...th_system.html

    One of the reasons that, as is often said of trying to keep a Jag running in the US, "All the parts that fall off are of the finest British manufacture."

    And there are lots of WWII stories about trying to fix Sherman tanks and Jeeps with Whitworth fasteners.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  4. #14
    David A. Goldfarb's Avatar
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    Quote Originally Posted by JBrunner View Post
    I would like to know a source for the nut with the 3 screw holes.
    Barry Young, who is an APUG member, made a couple of them for me. His prices were very reasonable, and he can machine them to order. I used them to add second tripod sockets to my 11x14" American Optical and 7x17" Korona, so that I could use them with Arca-Swiss style plates without worrying about the camera twisting on the plate and for extra rigidity. Now I can turn the Korona sideways for verticals.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  5. #15

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    Big/heavy cameras should use the 3/8-16 screws. I have not seen those "sockets" that can be screwed to the outside of a camera for sale anywhere so I would follow the advice and contact Barry.

  6. #16
    David A. Goldfarb's Avatar
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    Mine are mounted with the flange recessed inside the camera bed, top of the flange flush with the inside surface of the bed, so the tripod screw pulls the socket tighter and there's no danger of the socket getting ripped out of the camera bed. Barry can also make the flange diameter, barrel diameter, overall length, and screw thread to order, which is a considerable convenience. I had mine made so that I wouldn't have to buy any new drill bits, and so the overall length would correspond exactly to the thickness of each camera bed.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  7. #17
    Steve Smith's Avatar
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    Quote Originally Posted by Nicholas Lindan View Post
    It isn't 1/4" Whitworth... It is 1/4-20 UNC - a US screw thread.
    It's 1/4" and 20 tpi no matter what you call it. The only difference is the core diameter. 0.186" for UNC and 0.1887" for Whitworth.

    The British Standard Whitworth thread was specified in 1841. During WWII there were compatibility problems with various British, US and Canadian thread standards which lead to the UNC and UNF threads being adopted in the US in 1949.

    There were cameras in existence before 1949 with 1/4" 20 tpi tripod threads so I suspect that they were Whitworth.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  8. #18
    Frank Szabo's Avatar
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    Typically, the thread on the top of the tripod column is a .375 - 16 tpi (3/8) and the wrinkles in a camera's bottom can be either the 3/8 - 16 or 1/4 - 20. Bushings are available at camera shops to screw in to the camera's mount to adapt the 3/8 thread to 1/4.

    Were you speaking of the camera mount on a head or the tripod's connection?
    ...

    "Beer is proof that God wants us to be happy."

    Benjamin Franklin

  9. #19

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    I've gotten both sizes with the 3 screw fastening from Rockler.com
    Heavily sedated for your protection.

  10. #20
    Lee L's Avatar
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    3/8-16 screw held here:
    http://www.rockler.com/product.cfm?page=1641

    1/4-20 with prongs here:
    http://www.rockler.com/product.cfm?page=1592

    others here:
    www.mcmaster.com
    Fastening and Sealing: Tee Nuts

    Lee

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