Pnumaticic Benches

[John Fortiner]

Pneumatic OIL?????????
Paul Jansen told me a mix of 8 oz. of water and 2 oz. of Prestone or
equivalent.  IMHO oil has no business inside someone's home for exactly the
reason you have pointed out.
Btw - he also told me that getting that fluid into the tank was a total pain
you-know-where.  I used a 1 oz. syringe with a rather large needle (filed to
get rid of the sharp point.)  The water/antifreeze mix was in it in a matter
of a couple of minutes.
Anyway, the one I was given to work on had absolutely nothing but air in the
tank.  Charging it with just air gave a very spongy seat.  It is currently
filled as per Paul's instructions and working beautifully. No sponginess at
all on the seat when it is elevated.

John Fortiner 

-----Original Message-----
From: Isaac Sadigursky [mailto:irs.pianos at earthlink.net] 
Sent: Monday, March 13, 2006 11:17 PM
To: 'Pianotech List'
Subject: RE: Pnumaticic Benches

Hi,John and the rest who had followed the pneumatic bench thread! My 1/2
cents is:I had replaced bleeding hoses on a few and have one at home,after
repair works fine for the past 7 years.I followed all Jansens
recommendations about air pressure and pneumatic oil. Few bad
experiences:leaking oil on a white carpet in customers home!!! 
Hope this nfo helps.. Isaac

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of John Fortiner
Sent: Monday, March 13, 2006 10:55 AM
To: 'Pianotech List'
Subject: RE: Pnumaticic Benches

Fwiw - Jansen recommends 55# of air in that tank.
The one I have here from my client is inactive.  I'm going to pump it up to
correct pressure in a few minutes and will let you know what happens.  And
yes, this is from a Bose also - 9'6" Imperial....
I'm also sort of wondering if the hoses have developed leaks that the air is
escaping from....

John Fortiner 

-----Original Message-----
From: Dempsey Jr., Paul E [mailto:dempsey at marshall.edu]
Sent: Monday, March 13, 2006 8:45 AM
To: Pianotech
Subject: Pnumaticic Benches

Just a follow-up to this thread.

We have a "Boesendorffer" Adjustable bench at the University, had it for a
long time.

The original post for this thread did not specify the problems that were
being encountered but let me throw in this.

Our bench does not have a major hose/tank malfunction but what does happen
is that after the tank has been charged with 45-50# of air the bench will
work well for a while, then, the seat will start to lower very slowly when
someone is sitting on it. The rate of sag varys with the size of the person
doing the sitting!!

What I have found is that if I sit on the bench, lift the handle and let the
seat go all the way to the bottom, repeat this several times, the bench will
regain its adjustability and stability.

Lasts for a good while....don't ask my why.

Hope this makes some sense.

Paul E. Dempsey, RPT
Piano Technician Sr.
Marshall University
Huntington, WV
304-696-5418
304-617-1149



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