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Thread: Need Holes Drilled for Lens Flange

  1. #21
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Need Holes Drilled for Lens Flange

    What's a speed tap? Pictures and catalog reference please.

    - Leigh
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  2. #22

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    Re: Need Holes Drilled for Lens Flange

    https://www.speedtaps.com/

    It's just a brand of taps that is specialized for impact wrenches.

  3. #23
    Jac@stafford.net's Avatar
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    Re: Need Holes Drilled for Lens Flange

    Quote Originally Posted by Leigh View Post
    What's a speed tap? Pictures and catalog reference please.
    They might be good for very large work, but just scare me for the delicate sizes we use in camera fabrication.

  4. #24
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Need Holes Drilled for Lens Flange

    Quote Originally Posted by jim10219 View Post
    https://www.speedtaps.com/
    It's just a brand of taps that is specialized for impact wrenches.
    The smallest thread available is 1/4"-20.

    We're talking about tapping #2-56 threads.

    That's a very big difference.

    And those speedtaps are designed for use with an impact wrench, not hand-driven.

    - Leigh
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  5. #25
    Nodda Duma's Avatar
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    Need Holes Drilled for Lens Flange

    Erg.. I should have said high speed gun taps. Always said speed tap for short

    Don't get distracted by some company's variation of the basic principle.

    The key feature of high speed gun taps are the tapered starting threads and flute design which help self-center in a pre-tapped hole. Historically there were used in milling machines and drill presses. Now they are used in CNC mills for high speed tapping. But every machinist I know uses them to tap by hand as well because of how they work. Hand taps are similar but I prefer these.


    Surely I'm not the only person here who has spent time in a machine shop?

    https://jet.com/product/detail/5a63b...a:2&code=PLA15
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  6. #26
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Need Holes Drilled for Lens Flange

    Quote Originally Posted by Nodda Duma View Post
    Surely I'm not the only person here who has spent time in a machine shop?
    I'm a journeyman Tool & Die Maker. I've owned a commercial machine shop for over 30 years.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

  7. #27
    Nodda Duma's Avatar
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    Need Holes Drilled for Lens Flange

    Ah, excellent! I yield to your greater experience.

    I'm an optical designer who has been around machine shops for 10-15 years in support of that work (think prototype lens barrels and other small parts), and was trained by a Navy machinist with >30 years' experience.
    Newly made large format dry plates available! Look:
    https://www.pictoriographica.com

  8. #28

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    Re: Need Holes Drilled for Lens Flange

    Quote Originally Posted by Leigh View Post
    The meaning of "nominal charge" varies quite a bit.
    Its meaning for a photographer is very different from its meaning to a machinist.

    I have a commercial machine shop.
    My lowest rate, for really simple stuff, is $100/hour with a 1 hour minimum.
    At that rate I'm just breaking even, not making any profit.

    - Leigh
    Thanks, Leigh. That sure puts it in perspective.

  9. #29

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    Re: Need Holes Drilled for Lens Flange

    Why not use the flange as a retaining ring from behind? Sure beats all of the effort to drill, tap and hope its all aligned. That how my CE was mounted to a Cambo board and it works just fine.

    BTW, punker... that was the solution implemented by Steve's Camera Repair in Culver City.

  10. #30

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    Re: Need Holes Drilled for Lens Flange

    Quote Originally Posted by BrianShaw View Post
    Why not use the flange as a retaining ring from behind? Sure beats all of the effort to drill, tap and hope its all aligned. That how my CE was mounted to a Cambo board and it works just fine.
    This does work sometimes, but some shutters just don't have enough mounting thread to reach through thick lensboards and engage the flange on the other side, and some flanges have a raised bearing surface that's needed to allow clearance for aperture rotation. Also the rear element on some lenses won't screw all the way back in when the flange is mounted behind the board.
    Last edited by Colin Graham; 14-Apr-2017 at 15:10.

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