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This is a follow-up to a couple of previous posts (see Sound Problems) though the question is independent of this personal piano history.

The query/puzzle goes like this: What underlying problem could be responsible for both severe tuning instability AND the loosening of hammer butt flanges on an upright piano? Is there something that could explain/cause both, assuming environmental conditions have remained unchanged while both issues have developed?

I raise the question because the rebuilder from whom I purchased the piano and to whom I have brought my (expanding) list of problems, has responded by saying that he suspects he knows the underlying cause of both (though he was coy enough to withhold telling me what precisely that was, pending his consultations with others).

Any thoughts, comments, suggestions, welcome.

With thanks,

P.

I'd think that cyclical changes in humidity, as commented on in relation to your other posts, would be a good candidate.

Action makers Wessell Nickel & Gross have a beautifully illustrated description of the effect of humidity changes on flanges here:
http://consumer.wessellnickelandgross.com/wood-vs-composite-materials/

Always suspect humidity changes first. This can be easily proved or disqualified by purchasing a hygrometer. If the piano was restrung, that can be a source of tuning instability. The settling process can be accelerated by proper string seating.

From your many posts about the problems with your rebuilt Blüthner, I am starting to develop my own picture of the whole scenario, one underlying cause that would (or could) explain everything....
...a rebuild which was incomplete, not thorough enough or poorly carried out. Sorry to be so blunt, but there is it.

I agree.

I agree too.

I agreed too - over in the Piano Forum. The same scenario is playing out over there also.

Either that or PEBKAC.

'Had to google "pebkac". Doh!

Yea, either that or pebrhc. (problem exists because (of) relative humidity changes)

I wasn't going to ask! Haha!

I only offer it as a possibility. It is really impossible to determine exactly what is going on without looking at and listening to the piano.

That's the hardest thing to get through to piano owners. How do we know what the problem is from a computer screen? How do we know what the thing is worth sight unseen? It gets old, answering those types of questions sometimes.

Yer gonna hevta do what I do, Jerry. Put your ear right up to the screen soz you can hear the squeeks, rattles and buzzez, and get out your magnifying glass to search the words for clues as to what's wrong.

The slack of new plain wire represent a M3 in the first plain wire to a m2 at note 88.

So yes methods to stabilise the tuning have to be used, and as over tense chipping and rough tunings, massaging the strings with pressure and a hard wood piece (producing heat) massaging coils, etc.

I know a few rare colleagues that only tune up to 445, but the wire accept way more before being in danger..

The settling of the soundboard take place also. What I am afraid of is exaggerated bridge roll, and if the bridge is tall this may be a real problem.

I heard some factories employed a setup to lock the bass bridge when basses are bring to tension.. May be a good idea. I tried that without noticeable difference.

The tone is better when tuning from above, the the bridge raise is noticed providing better downbearing for some time.

Regarding humidity fluctuations, I have two hygrometers, one of which records daily maxima and minima, and since I received the piano in July the all-time high recording (only once) was 71%RH and the absolute minimum (again only once) was 38%RH, the high being in early August and the low in late November. Daily fluctuations rarely vary by more than 3 or 4% in any 24 hour period, and the decline in RH from July-August has been steady: mid 60s in July and August, mid-50s in September and steady at the mid-40s through October, November and December. This seems to me a very modest and moderate fluctuation in RH (though I am open to correction on this) and safely within the 40-70% 'safety zone' displayed on the small analogue hygrometer provided by the rebuilder. So if this accounts for many of the problems, then either (as many of you have suggested) the rebuild quality is less than stellar, or this particular piano is extremely 'sensitive' [=delicate]. I suspect the former, though the rebuilder wants to blame the environment (predictably enough.) Either way, the proof of the pudding will be when piano no.2 arrives and copes (or doesn't) when in the same environment.

Whether piano owners wish to admit it or not, many do not, is not relevant what piano owners wish for.. The fact is, that pianos DO and WILL change relatively quickly and very easily from humidity changes. Especially when they have been rebuilt or are new.

A change from 70 % in August to 38 % in November is a large change. It is 50 % less of what it was in July. Of course, the piano will be flat and out of tune with itself because of this. And yes, hammer flanges can come loose.

Of course, it is a gradual change. That is pretty typical. Here in Michigan, in August it can easily be 70% RH. In September, it will be in the 60 % range, continuing down as the cooler weather continues.

A piano is made primarily out of wood. I read once years ago, that during the average summer in Michigan, the wooden frame of a door in our home will swell by 1/4". During the winter time, that same door, shrinks by that much AFTER it looses the 1/4" that it gained by swelling in the summer. It is no wonder that our drawers, doors and windows will sometimes stick.

Just because they are painted doesn't mean they are no longer capable of absorbing humidity.

As a piano owner, if you want your piano to maintain its best, it is your responsibiltiy to do whatever you can to maintain a fairly constant relative humidity (RH) where there piano is located. By that, I don't mean between 70 % and 35 %. I mean, between 40 % and 50 %.

All technicians receive complaints constantly that my piano was just tuned but now it's out of tune. In looking up our records, we see that it's been 4, 5 or 6 months since its last tuning when the RH was double or triple of what it is now. The biggest argument I get from my clients is "well, that shouldn't happen!" Why not? "I don't know, but, it JUST SEEMS like it should stay in tune longer." It is a lack of understanding about what actually takes place with the wooden parts and the causes of why a piano goes out of tune and why piano manufacturers recommend tuning your piano between 2 and 4 times every single year as a minimum because they all know that the piano will indeed go out of tune often under these ever changing humidity circumstances.

As an addendum to Jerry's post, there is another little unpleasantry associated with relative humidity. I've noticed that the effectiveness of the popular in-piano humidity control system varies according to locality and even from house to house in the same general location. The results are uneven enough that I only suggest them now if the customer seems to understand that they are not a panacea, but only a help.

Jerry: These figures are the extreme 'spikes' in a daily-fluctuating long-term trend, not the the trend-line itself. While such figures may have been registered for a few hours in total over the course of 5 months, the decline from around 65% to 45% represents the more enduring state of affairs. Of course, that 20% shift may be sufficient to precipitate problems, but if so, then I'd expect that there are quite a lot of other new and rebuilt pianos 'settling-in/falling-apart' out there. Yet that doesn't appear to be the case to judge by others responses to experiences of 'settling in'.



Jerry: The piano was tuned on a monthly basis, during which time the RH would have reduced by around 5% per month on average if we flatten the trend line. In fact, however, on the the first and second, and fourth and fifth tunings, there was little change in RH, the main decline having taken place between the second and fourth tunings. Yet still it went south very quickly after all tunings, not to mention all the other problems.

In short, I find it hard to believe that 20% shift in RH over 5 months could effectively wreck a new piano. If that was the case, then I don't think there would be too many pianos in the world today.

Who said anything about wrecking a piano? None of us knows anything about the rebuilders capabilities or the tuners for that matters. If they did lousy work then anything is possible.

It does not take much RH flucuation to change a tuning. Open a window causing a draft to pass by the piano and it will change rather quickly.

That's why I said, piano owners, due to a lack of understanding it, argue with us about the true causes of why pianos go out of tune and that is exactly what you are doing now.

You need to follow some advice here and get another technicians opinion of your piano and it's situation. As has been said here, nobody can tell what is truly wrong with your piano without seeing it first hand. But, the RH factor's remain. It is changing and that change will cause a piano to go out of tune.