[pure-silver] Re: bad vibrations
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 29 Jan 2006 10:29:36 +0100
Richard Knoppow a écrit :
What kind of filter does it have?
It came without a filter, used, very hard apparently, for a long time
at a lab here in Houston. There's a sign on it that says "Change the
filter weekly" . I asked the guy who helped me set it up where the
filter was, but he didn't know, and so I used it until today without
a filter. But today was the first day that I've noticed a lot of
vibration. Maybe it was always there but I didn't notice.
After I read the message from Rob about how not having a filter might
be causing the air to go through too fast, I made a filter from two
thicknesses of Swiffer. This slowed down the vibration a lot, but did
not completely eliminate it. This makes me think that the problem was
the absence of a filter. Maybe tomorrow I'll try printing with three
thicknesses of Swiffer, until I can get a real genuine Devere filter
or talk to the people there about what kind of filter to use.
To tell the truth, the prints I made today when it was vibrating bad
don't look too terrible. I made some others with the same negative
and a different enlarger that doesn't have a fan, and tomorrow I'll
inspect them with a loupe and see if there is a difference.
--shannon
I Asked this because some types of filter material, like furnace
filters, are available at places like Home Depot. These can be cut
down to fit. If the original was a foam filter the material is
available at stores that sell foam rubber products. Filer foam is
porus, usually you can see through it. I found foam for equipment at
work where the original filters had disintegrated and the manufacturer
did not stock new ones. the stuff comes in sheets of various
thicknesses and is not expensive.
The blower you have sounds like a modified vacuum cleaner, perhaps
it takes some standard vacuum cleaner filter.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
Unifilter makes foam filters for motorcycles air-boxes use which can be
cut to the right dimension.
These filters are of three types depending the level of filtration
required (coarse, medium, fine) and are meant to be oiled (there is a
special "sticky" oil for this purpose) to trap dust. Avoid excess of oil !
They can be washed and re-oiled.
I use the fine models for my film dryers.
http://www.unifilter.com/online%20catalog/accessories.html under "Bulk
Foam".
Best regards,
Claudio Bonavolta
http://www.bonavolta.ch
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