[CAUT] Pinning - was; rehearsal room climate swings

[Jim Busby]

Hi John, Ron,

How does that (RH swings) affect your center pinning?? When could you
effectively repin? Pinning during low RH may cause the pins to seize up
during high RH, and loose pinning might occur with the opposite
scenario.

I recently repinned an M during 45%RH and when it went down to 20% my
5-7 grams went to 2-4 grams! (For you "swingers" it went from about 3-5
swings to 7-10 swings) Not only did this cause rep spring problems but
the sound of loose hammer pinning is different than good pinning. (Chris
Robinson/Rick Baldassin did some spectrum studies which verified this.)

This is a concern I've had which I don't remember ever being addressed.
I've just tried to "get by", but there must be some pinning wisdom out
there that I'm missing.

Regards,
Jim Busby BYU

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
John Minor
Sent: Tuesday, May 16, 2006 1:23 PM
To: caut
Subject: [CAUT] rehearsal room climate swings

I've been fighting wide swings in temp/humidity in university
buildings for 13 years now and the tuning stability seems to
get worse each year. One of our buildings recently underwent
HVAC updates and the air exchange is now much more rapid that it
ever was. I suspect this constant high volume flow of outside
air around the pianos has a great deal of destabilizing effect.

Has anyone tried using Edwards String Covers to shield the
pianos from all that airflow? 

Any ideas?

John Minor
University of Illinois

The 2 images are from a DICKSON DATA LOGGER tucked under the
soundboard of a Steinway B in large rehearsal room. It was set
to log hourly readings.