freebies

[Mike and Jane Spalding]

Terry,

I'm still trying to figure this out for myself, so don't take this as gospel, just my current belief, which is still evolving:  It seems to me that if all of the notes are within 1cent after first pass, then the tensions are correct, and the plate/rim/case/string system is in equilibrium.  The primary instability is in the tuning pin, and perhaps that first segment of string from pin to agraffe/capo, which has not been "settled".   So on the second pass, each string will be pulled above pitch and settled back down, ending up at the same tension, but with stable settled pin and first segment.  This one-string-at-a-time excursion, ending at the same tension, doesn't cause any neighboring strings to de-tune.  Make sense?

The RCT creators/teachers contributed to a pitch-raise string here a couple of weeks ago by warning against pulling above and settling during the pitch raise pass, indicating that the overpull calculations were not appropriate for that procedure, if I understood correctly.

Mike Spalding

----- Original Message ----- 
From: Farrell <mfarrel2@tampabay.rr.com>
To: Pianotech <pianotech@ptg.org>
Sent: Monday, January 27, 2003 6:37 AM
Subject: Re: freebies


> "Second pass, none of the center strings was off more than a cent, but 90% of them settled 5 to 10 cents as soon as I touched them."
> 
> And often, especially in the upper treble, they will drop even more. So how do you correct? Increase the tension on the string - correct? If you increase the tension on each string in the upper treble to raise the pitch 10 cents, doesn't each string you have just "tuned" drop in pitch be about 3 cents? I don't understand how you can do a pitch raise, not settle the pitch firmly, and expect things to stay there.
> 
> Terry Farrell
>   
> ----- Original Message ----- 
> From: "Mike and Jane Spalding" <mjbkspal@execpc.com>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Saturday, January 25, 2003 4:26 PM
> Subject: Re: freebies
> 
> 
> > I've been following this string with great interest, since I am looking for ways to speed up pitch corrections and 1st passes to the point where I can confidently schedule tunings at 2 hr. intervals (no, difinitely not bionic).  According to Dean and Mitch, RCT pitch raise mode works most accurately when you DON'T overpull and settle:  just pull it to pitch and move on.  Fortuitously, this also saves time.  But I have to agree 100% with Ron, on the second pass I need to handle every pin again, because too many of them will drop significantly with the slightest downward pressure of the hammer.  Case in point, Small (10 to 20 cent) pitch raise on 10-year-old Baldwin B Friday morning.  Pitch raise pass, about 30 minutes.  Second pass, none of the center strings was off more than a cent, but 90% of them settled 5 to 10 cents as soon as I touched them.  I just don't see how a "pull them up and leave them" pass can result in any "freebies".
> > 
> > Perhaps unrelated side note, I've noticed that on the first pass, even on non-neglected pianos, the strings sometimes settle significantly as soon as I put the hammer on the pin.  Maybe that's a result of the humidity-induced pitch changes that we enjoy here in the upper midwest?
> > 
> > Mike Spalding RPT
> > Wisconsin
> > 
> > ----- Original Message ----- 
> > From: Jonathan Finger <johann@tollidee.com>
> > To: 'Pianotech' <pianotech@ptg.org>
> > Sent: Saturday, January 25, 2003 1:41 PM
> > Subject: RE: freebies
> > 
> > 
> > > "but when a tuning hammer is put on them, they change at the slightest 
> > > touch and stay there."
> > > 
> > > Well, as I said, I concentrate on setting the pin.  Therefore, the pin
> > > doesn't move when the hammer is set on it.  I'm not just flexing the pin
> > > as some do, but moving it in the wood, and furthermore, understanding
> > > how and where I'm moving it.
> > > 
> > > " Especially after having just done a quick 
> > > pitch correction over the entire piano, which is what my post is about."
> > > 
> > > And I was responding to your post, in regards to the first quick pitch
> > > correction.
> > > 
> > > Best Wishes :)
> > > 
> > > Jonathan Finger RPT.
> > > 
> > > 
> > > 
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