[pure-silver] Re: bad vibrations

Look at the fan and it's mount. The fan should be coated with dust. The 
dust flakes off and it vibrates causing oscillations. How could the neg 
carrier move? It's  clamped down. Correct? The rubber bushing may not be 
soft anymore. My 10x10 Fotar with a Omega color head shook so 
bad I could feel it. A lab gave me the enlarger because it did not 
produce sharp prints anymore. 10 minutes later with the help of 125 PSI 
air and a vacuum cleaner no vibration at all. I clean it every 3 months. I
keep the fan shiny.
Ken



Today when I was using my older model 108  Devere enlarger with the 
8x10 mask in it, I noticed that the image was visibly moving around 
on the easel!  Yikes!  This enlarger has a big fan on it because the 
lights get so hot.  Previously, when using the smaller masks (4x5, 
6x6cm) vibration hasn't been a problem. I went all around the 
enlarger looking for sources of the vibration.  The head itself 
vibrates quite a lot, but again, this has never caused visible 
vibration on the paper with the smaller masks.  I tied up the duct 
hose going from the head so that it doesn't touch anything, but the 
vibration is still barely visible.

Strangely, the prints don't look fuzzy to the naked eye.  But they 
MUST be affected by this, right?  I was thinking of trying to enlarge some
8x10 negatives, but given how much the image shook when I put a medium
format strip in that holder, I wonder if I should even try. (I don't have 
a
lens mounted in a lensboard yet for 8x10 negs.)

My only idea about why the 8x10 glass carrier vibrates so much more 
than the others is that the others have a sort of hole, like a finger 
hole,
and maybe the air can pass through that hole, whereas with the 8x10 holder
there is no hole, so the fan just sucks on the glass and the resistance
causes some vibration.  (Oops, Eudora doesn't like that word "sucks."  
I'll
probably get some red peppers next to this message.  But seriously, bad
vibrations suck! Yes, indeed, I have two hot peppers!)

Any suggestions?

--shannon
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Ken Hough Photographic Repair Service
Specializing in the Complete restoration of
           Deardorff View Cameras 
                            Est 1982
     www.deardorffcameras.0catch.com
                      219 462 0281


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