[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


I found the filter pad place, but there were no filters there. It seems that I have been using this thing for about a year with no filter pads! I opened it up to see if there was a lot of dust. Not really. I don't see how dust in this case can cause vibration, but maybe it does. The fan itself is in the unit on the floor, which also contains the motor that drives the fan.

In the Devere, the negative carrier is not exactly clamped down. It goes in a little drawer and just sort of floats there.

--shannon




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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