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9492Re: [PPLetterpress] Re: platemaking issues

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  • typetom@aol.com
    Mar 12, 2008
      Something new (something old & new) every day. Thanks, Eric.

      My nuArc vacuum frame has a name plate but no model number, no bleed valve,
      but a pressure gauge on the line. It has a glass top hinged within a metal
      frame, with a vacuum area about 21.5 x 25.5. Not clear whether it ever had a
      light attached -- it appears to have been part of a larger apparatus. The
      vacuum space below the glass is sufficient to handle plate material, more than a
      just contact prints.

      Meanwhile, I do dust the plate material with powder to prevent it from
      grabbing the negative. I don't think air bubbles are the cause of the exposure
      irregularities I experienced. Uneven pressure on the plate and negative at the
      edges of the plate (which I have assumed involves some slight bending of the
      glass) seems the likely explanation. Mat board around the plate seems to solve
      the problem completely. Whatever works!


      Tom Parson
      Now It's Up To You Publications
      157 S. Logan, Denver CO 80209
      (303) 777-8951 home
      (720) 480-5358 cell phone

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