[pure-silver] Re: floor vibration?

I wonder how we could accurately determine if there is vibration, and the
severity of it? 
I have three enlargers, a counter mounted Zone VI with the head attached by
a rod to the wall, A Beseler MXT wall mounted with the Beseler mounting
system and a free standing Durst Laberator 138S. Although all the enlargers
produce shape pictures I suspect the Durst is the least affected by ambient
vibration because it is freestanding. The Zone VI, and the Beseler have cold
light heads, and the Durst has a condenser head with remote wall mounted fan
that is used when I use high wattage bulbs. The fan and the vacuum easel
both have rheostats to slow down the motors. I have not noticed any
difference in image quality caused by the fans. 
I have noticed the vacuum easel really does flatten the fiber based paper
compared to my Salt Hill easel. The Condit glass carrier also flattens out
the negative compared to the Carlwen holders which only hold the negative by
the edges. Could the negative be vibrating in the holder caused by fan
induced vibration transmitted by air? 
Since the darkroom is on the second story of a wood frame house I avoid
working when there is other activity going on. After any contact with the
enlarger or counter I allow vibrations to subside before exposing the image.
I have tried looking at the image reflection from the surface of water in a
glass on the easel, and yes there is sometimes vibration present. Is the
water surface an accurate display, are the negative and the image receiving
surface vibrating in phase equally, and are the amplitudes equal I suspect
not.
 Is this really a problem? 
I imagine there are other factors involved that effect how sharp the print
appears, and these may be greater issues than vibrations in the enlarger.

Jonathan Ayers  [mail1@xxxxxxxxxxxxxxxxx] 

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Shannon Stoney
Sent: Monday, September 29, 2008 2:07 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] floor vibration?

I have a question about the new darkroom that I'm building in a garage 
in my back yard.

My old darkroom was a box inside a garage.  The floor was a concrete 
slab.

  In the new darkroom, we had a wooden floor built on top of the slab, 
because the slab was so uneven.  The walls are now tied in with the 
floor, and there is a vent hood mounted on one wall, with a fan on a 
shelf next to the hood to pull air through the vent hood.  In the old 
darkroom, the vibration from the fan vibrated the wall, but not the 
enlarger, because the enlarger sat on a table on the concrete slab.

Today I suddenly got worried that the vibration from the vent fan on 
the vent hood over the sink would vibrate the floor, because now the 
floor is tied in with the wall.  Then if the floor vibrates, the table 
that the enlarger sits on might vibrate also.

So, what should I do to prevent this from happening?

--shannon

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