Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 76,343   Posts: 1,682,431   Online: 969
      
Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 35
  1. #11
    jeroldharter's Avatar
    Join Date
    Nov 2005
    Location
    Wisconsin
    Shooter
    4x5 Format
    Posts
    1,954
    Images
    1
    FYI. 32 inch wallpaper tray for ~$4:

    http://paint-and-supplies.hardwarest...y--640616.aspx

    Jerold Harter MD

  2. #12

    Join Date
    Jul 2010
    Shooter
    Medium Format
    Posts
    357
    You can buy ventilation pipes that are 31 1/2 inches in diameter, made of PP - polypropylene. They're grey, but the wall is 5/8" thick, so should be completely opaque. A 6-foot piece would allow you to process a 72x90" RA4 print, that is if you find a solution for even development.

  3. #13

    Join Date
    Jun 2009
    Shooter
    4x5 Format
    Posts
    232
    Images
    7
    I made my own print drum from thin walled 8in. pvc irrigation pipe 40in long. For the paper channels I used 36in pvc blades from a cheap Levelor type blind and for the sealed end, a flat piece of pvc cut to fit and drilled to accept a 2in pvc elbow and on the inside surface a 5in. pvc light and splash baffle. All components were glued using pvc pipe cement. An 8in pvc pipe cap fits the open end and I attached a thick piece of pvc, heated and bent to form a handle for the cap was glued to the cap. The cap is leak proof in use with no gasket necessary. I made paper channels for 16x20, 20x24 and 24x38 in paper. I had to make a roller base for it and it clamps to the counter and all rotation is done by hand. It has worked so well that I use it for all my large prints and when I need to make prints from 50x80 in. or longer, I use troughs made of the same pvc pipe cut in half and legs glued to the troughs made from thick pvc flats or 1in pvc pipe heat bent and formed into a cradle and legs and glued to the troughs. With the troughs the biggest print I can make by my self without help is 50x96in. Because the PVC is white, it is not light proof so processing must take place under safelight. I will try to get some pictures of the tube and post them if anyone is interested. I have posted pictures of my mural troughs before so a search should locate them if you are interested. Incidentally, I can process two 16x20 prints in the drum at the same time and although 16oz. of chemistry will cover the prints, for safety sake I always use a liter just to be safe and it will still have enough capacity for two more 16x20's before exhaustion. All the above information refers to color prints. Black and white chemistry has much more capacity. When printing color prints with such large tubes, NEVER use a prewet to heat the tube as it causes staining and uneven development. If you need to heat a large drum use a hair dryer or other form of dry heat.
    Denise Libby

  4. #14

    Join Date
    Jul 2010
    Shooter
    Medium Format
    Posts
    357
    Denise, I'd be very interested to see some pictures of the print drum you described at the beginning of your post. Thanks.

  5. #15
    michaelbsc's Avatar
    Join Date
    Dec 2007
    Location
    South Carolina
    Shooter
    Multi Format
    Posts
    2,106
    Images
    5
    Quote Originally Posted by jeroldharter View Post
    Not all PVC pipe is light proof from what I understand. If you used 36 inch wallpaper troughs, you could leave one end of the tube open and spin the tubes in the trough under safelight.
    ABS pipe also comes in 8in diameter, and that should be totally light proof. Making a light trap might be troublesome, but is certainly possible. Just use on of the Unicolor tube as a template.
    Michael Batchelor
    Industrial Informatics, Inc.
    www.industrialinformatics.com

    The camera catches light. The photographer catches life.

  6. #16

    Join Date
    Nov 2008
    Shooter
    Multi Format
    Posts
    203
    Quote Originally Posted by darkroom_rookie View Post
    Denise, I'd be very interested to see some pictures of the print drum you described at the beginning of your post. Thanks.
    I second that!

  7. #17

    Join Date
    Jun 2009
    Shooter
    4x5 Format
    Posts
    232
    Images
    7
    Here are some pictures of the drum I made from PVC. The size limit on the lid says 24x32 but most often I make 24x38in as the drum easily accommodates that size also notice the home made roller. PVC rollers cut from 1/4 in stock and bushed with 1/4 brass bushing. Works like a charm.
    Denise Libby
    Attached Thumbnails Attached Thumbnails drum 002-1-1.JPG   drum1-1.JPG  
    Last edited by archer; 12-03-2010 at 02:20 AM. Click to view previous post history. Reason: forget to attach images

  8. #18

    Join Date
    Jul 2010
    Shooter
    Medium Format
    Posts
    357
    That looks great! So the baffle prevents any splashing of the chemicals before the rotation begins. Kind of like the Unicolor drum, just bigger. Is the upper position of the elbow at the sealed end tangential to the gap between the blades/paper channels?

  9. #19

    Join Date
    Jun 2009
    Shooter
    4x5 Format
    Posts
    232
    Images
    7
    dark room rookie;
    yes it is and the messy looking silicon sealant prevents turbulence from the paper channels. It was a learn by doing process and the drum works well for both black and white or color. I couldn't find any ABS tubing less than 1/4 in thick and that was just too heavy for me and the ABS caps fit very tight and were hard to remove and they still leaked, so I used PVC and develop under safelight which poses no hardship and the PVC cap fits more precisely and does not leak. The PVC tubing is also available in 10in and 12in and would make tubes capable of print widths of 30 and 40 inch and more.
    Denise Libby

  10. #20

    Join Date
    Jul 2010
    Shooter
    Medium Format
    Posts
    357
    Denise,
    Thanks for the explanation and the pics, quite instructive and helpful. The caps I have also do not leak, but are a bit hard to remove. Do you think the Jobo-style cup or a similar one in Cibachrome drums is less effective for the even development of a 33x44" colour print?

    d_rookie

Page 2 of 4 FirstFirst 1234 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin