Eureka! Jobo 3063 Insert for 7x17

Discussion in 'Ultra Large Format Cameras and Accessories' started by Keith Pitman, Dec 2, 2007.

  1. Keith Pitman

    Keith Pitman Subscriber

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    Today I constructed an insert for the Jobo 3063 drum to hold 7x17 film and it seems to work well. I found a plastic shelf liner material at the Container Store in Denver: "Plast-O-Mat Ribbed Shelf Liner." It is smooth on one side and has ribs on the other -- about 3/16 inch apart. The material is 24 inches wide, more than enough to fit the 3063 drum. The ribs allow the solutions to flow behind the film.

    I then attached "sew on snaps" that I got from a sewing store at the critical points to hold the 7x17 film in place. I didn't sew them in, but drilled a hole through the shelf liner, and snapped one side to the other. I used four snaps for each piece of film: two on one side, one on the other, and one at the back as a stop.

    Finally, I attached each end of the shelf liner to itself with a one inch overlap using pop rivets to hold the assembly around the Jobo drum's inner circumference.

    I tested the works by developing a extra exposure I made this morning. The film held in place throughout the process and the development seems to be even and satisfactory . I haven't printed the negative, and used an untested, sore thumb development time, so more work is in order, but it's encouraging.

    A few comments, observations, and notes:

    > I assembled this for one piece of film only, but I can add additional snaps so the assembly could hold three pieces of film.

    > The snaps have a beveled edge that provides a place to slid the sheet of film under and hold the film in place.

    > The snaps are brass with a black paint finish. If the black paint breaks down, I would remove the paint entirely, and just use a unfinished brass snaps, which should not be affected by processing chemicals. I had hoped to find a similar snap in plastic, but wasn't successful.

    > I'm concerned about using the pop rivets as they are steel and would like to find something else. Any suggestions appreciated.

    > Adding additional sheets of film could affect how this works, e.g., will the shelf liner support three sheets of film? I think it will be OK, but will not know until I get a chance to test the assembly with all three sheets.


    A few pictures are included.


    Any comments or suggestions are appreciated.
     

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  2. mark

    mark Member

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    Cool. Looks like you could get another sheet in there too.
     
  3. epatsellis

    epatsellis Member

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    With regards to the pop rivets, McMaster (and I'm sure others) sell plastic pop rivets, or you could use nylon push or drive rivets, they have a pin that when pushed in expands the fingers on the other side.


    erie
     
  4. Keith Pitman

    Keith Pitman Subscriber

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    Thanks for the McMaster suggestion. I'll try to track down plastic pop rivets.
     
  5. bdial

    bdial Subscriber

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    Auto supply stores are another source for similar devices in plastic, which are used for holding door panels and other trim.
     
  6. jp80874

    jp80874 Subscriber

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    Fantastic. Go for it. Congratulations. I really want one that will do three sheets of 7x17. I have a 3063 and repeat my earlier offer to help testing if needed. I use Rollo Pyro in a CPP-2. Let me know if I can help.

    John Powers
     
  7. Keith Pitman

    Keith Pitman Subscriber

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    I believe I will be able to get three sheets on the insert. I'll be traveling for the next 10 days, but will do some more work on this when I get back to home base.