Dampp Chaser and Grand Action

Farrell mfarrel2@tampabay.rr.com
Thu, 28 Aug 2003 06:35:17 -0400


David Love wrote:
"He had a Kawai before and recently bought a S&S.  Imeasure the humidity whenever I tune and he also has a ygrometer in the room.  The range has been from 30% to 80%."

Did you service the Kawai? Did it have action friction problems apparently associated with RH fluctuations? 30% to 80% RH range just doesn't seem too extreme to me. That is about what I observe in homes in the Tampa, Florida area. That is what my home RH commonly ranges. I have a Boston and have no friction problems at all - not too much, not too little. 

I realize this would be beyond practical, but it would be very interesting to accurately measure friction on this "B" action, and a second action - like the old Kawai perhaps - keep the other action with the "B" and measure friction changes over the full RH range. If the "B" has problems and the other doesn't, dump the "B". 

Again, a 30% to 80% RH range just doesn't seem like it should be the source of action friction problems. Anyone else care to chime in on this assertion? My experience on this may well be on the short end of the scale.

"BWs between 45 and 50 grams.  Add a little high friction and DWs were near 70 grams on some notes.  Nice.... "
".......addressing action leverage problems.  Unfortunately, I believe that this is another plate indexing problem in which the capstan is located too far back and the ratio is just too high producing a very heavy feeling action."

The friction issue is an interesting technical problem. The S&S leverage thing is something else all together .......... I won't even attempt to touch that one (as the smoke starts billowing from my ears) - except to say that the way that I solved my own personal S&S manufacturing problems was to dump the S&S and buy a Japanese-made piano (Boston). My new piano works great!

"He is a good player with high expectations for the instrument (who wouldn't have after $60,000)."  

See above.

Terry Farrell
  
----- Original Message ----- 
From: "David Love" <davidlovepianos@earthlink.net>

> I'm in San Francisco.  I've been tuning for this person for awhile.  He had
> a Kawai before and recently bought a S&S.  

SNIP

This PTG archive page provided courtesy of Moy Piano Service, LLC