Kawai CA-40 tuning problem

[justpianos@our.net.au]

List
Does anybody consider using an "impact driver" as suitable, or extreme for 
plate/pinblock screw tightening?
Your comments please.
Bruce Browning - The Piano Tuner




Michael Spalding <spalding48@earthlink.net> said:

> Michael,
> 
> I consider flagpoling an annoyance during tuning, but not a likely cause of 
instability as long as I have done the requisite test blows with pin-
wiggling.  But go ahead and CA the bushing - I don't see how it could do any 
harm.
> 
> Others have suggested checking and tightening pinblock screws.  Much more 
likely culprit in my view - in fact, do all the plate screws all the way 
around the piano.  Equal opportunity problem, affects new or old.
> 
> How's the string rendering through the front duplex?  Too much friction, 
or "stick and jump", can easily defeat stability.
> 
> Any other impressions from tuning, of unusual behavior?
> 
> Mike
> 
> 
> 
> 
> ----- Original Message ----- 
> From: Michael Gamble 
> To: pianotech@ptg.org
> Sent: 6/16/2005 10:49:46 AM 
> Subject: Kawai CA-40 tuning problem
> 
> 
> Hello Listers
> This Kawai grand is not that old. It simply will not stay in tune. My 
colleague at Glyndebourne had tuned it the previous day - and, like.... it 
was horrible! Not just the 8ves, but the unisons also. He invited me to "have 
a go" - which challenge I took up with gusto! Next day I had a "look" at the 
tuning and found that... although it wasn't as bad as when I started the 
previous day it had indeed drifted. Now I think the web bushings are soft and 
the wrest pins are flag-poling. So I have a notion to inject some CA in there 
to try and solidify those bushes. What does the Team think?
> Regards from a Bartered Bride day in the Sussex Downs
> Michael G.(UK)



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