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Thread: Hole Saw For Commercial Ektar Lens

  1. #41
    Drew Wiley
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    Sep 2008
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    SF Bay area, CA
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    Re: Hole Saw For Commercial Ektar Lens

    I mount the lensboard to a much larger wooden board using four perimeter sheet metal screws with metal-cap rubberized washers. This holds the lensboard completely tight without marring it at all. Then the wooden board is what is tightly clamped to the drill press table. This also allows a cleaner cut by the bit entering the board at the end of the cut, rather than pushing the metal through. Not as elegant as a milling machine, but good enough. One does not punch diecast alloys; leave that technique for electrical box knockouts.

  2. #42

    Join Date
    Sep 1998
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    Loganville , GA
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    14,409

    Re: Hole Saw For Commercial Ektar Lens

    Quote Originally Posted by Drew Wiley View Post
    I mount the lensboard to a much larger wooden board using four perimeter sheet metal screws with metal-cap rubberized washers. This holds the lensboard completely tight without marring it at all. Then the wooden board is what is tightly clamped to the drill press table. This also allows a cleaner cut by the bit entering the board at the end of the cut, rather than pushing the metal through. Not as elegant as a milling machine, but good enough. One does not punch diecast alloys; leave that technique for electrical box knockouts.
    A good Greenlee punch can make a good hole in a metal board if used properly and without excess force.

  3. #43
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
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    18,338

    Re: Hole Saw For Commercial Ektar Lens

    You mean an old Greenlee punch. Greenlee is now mostly just a marketing label for things made on another continent in the same bit factory as half a dozen or more brands.

  4. #44

    Join Date
    Sep 1998
    Location
    Loganville , GA
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    14,409

    Re: Hole Saw For Commercial Ektar Lens

    Quote Originally Posted by Drew Wiley View Post
    You mean an old Greenlee punch. Greenlee is now mostly just a marketing label for things made on another continent in the same bit factory as half a dozen or more brands.
    That’s why I said good.

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