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Quiz Time...
#2986753 06/01/20 05:04 PM
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OK Kiddos, it's Piano Technician Quiz Time!
This might new for some folk but may be interesting for everyone...

Customer Complaint: "It went way out of tune recently and was just tuned in March".

Technician observation: Mid-range on pitch and playable but tuning uneven. Tuning uneven in bass and off with mid-range. From C-52 the upper note each ascending octave is progressively 50 cents flatter than the previous one.

Here are photos:
[img]https://drive.google.com/file/d/173Ecl7PRX5Wvp-cCo6JyKFSrtLxJA2D7/view?usp=sharing[/img]

[img]https://drive.google.com/file/d/1nKBEv1JYBgZxmuNxvRcN24HmjoKhp7jL/view?usp=sharing[/img]

And your diagnosis is??


Keith Akins, RPT
Piano Technologist
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair
editor emeritus of Piano Technicians Journal
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Re: Quiz Time...
kpembrook #2986760 06/01/20 05:12 PM
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Pin block separation from the back frame.


Jean Poulin

Musician, Tuner and Technician

www.actionpiano.ca
Re: Quiz Time...
kpembrook #2986810 06/01/20 07:38 PM
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Say Hi to a really old piano (85 keys) and the final result of having it in a really dry place.

Climate Change.

Re: Quiz Time...
kpembrook #2986811 06/01/20 07:42 PM
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No, the problem is L.B.M. (Lateral Bridge Migration). Notice how all the strings are straight up and down? The bridges have moved sideways!!!


Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?
Re: Quiz Time...
kpembrook #2986841 06/01/20 09:20 PM
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My money is on Toon.


When you play, never mind who listens to you. R.Schumann.

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Re: Quiz Time...
kpembrook #2986872 06/02/20 12:53 AM
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Off topic, but that piano reminded me of a wine bar I saw on OfferUp today. https://offerup.com/item/detail/826463292/

How would the bridge move sideways?


Anthony Willey, RPT
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Willey Piano Tuning
Re: Quiz Time...
kpembrook #2986877 06/02/20 01:32 AM
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The plate is twisted forward in the high treble. Jean Poulin is correct.


Semipro Tech
Re: Quiz Time...
AWilley #2986950 06/02/20 09:06 AM
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Originally Posted by AWilley
...

How would the bridge move sideways?
Uh, reminds me of a quiz show where two contestants were so smart every show ended in a tie. Out of desperation the host chose to let the contestants ask each other questions. The first question was how could a gopher made a burrow without leaving any mound of dirt at the top. The answer given was that the gopher started the burrow at the bottom, with the next question being "How did the little devil get there to start with?"

So how would the bridges move sideways? Well! It's the only direction they could move considering the angle of the strings across the bride pins!


Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?
Re: Quiz Time...
BDB #2986965 06/02/20 09:47 AM
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Originally Posted by BDB
The plate is twisted forward in the high treble. Jean Poulin is correct.
Of course, you guys caught it right away.

Next question:
How much further do you think the plate would have to bend before it breaks?
[In the bass it's about 1¼" underneath the lid overhang while in the treble it is about ⅜" beyond the overhang. It's not a full-perimeter plate but like a grand (only reverse mirror image). So it's not just bending forward like some of the three-quarter plates do when the pinblock lets go from the back frame. Rather, the treble corner is bending forward and twisting towards the center.]


Keith Akins, RPT
Piano Technologist
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair
editor emeritus of Piano Technicians Journal
Re: Quiz Time...
kpembrook #2986971 06/02/20 10:03 AM
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Originally Posted by kpembrook
...

Next question:
How much further do you think the plate would have to bend before it breaks?

...

Ooooo, we get to find out? Might go viral on Youtube. Be sure to make it dramatic. Don't just put a chain fall on it. Maybe pull on it with a vintage tow truck driven by a buxom broad. Oh, Yeah!


Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?
Re: Quiz Time...
kpembrook #2986976 06/02/20 10:18 AM
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I don't think it could go much further. It is surprising how much cast iron will bend.

I've only ever had a plate brake on me while restringing an upright. The pin block was not properly fitted to the flange so not the same situation as this piano. Scared the heck out of me, as loud as a gun shot.


Jean Poulin

Musician, Tuner and Technician

www.actionpiano.ca
Re: Quiz Time...
kpembrook #2986980 06/02/20 10:45 AM
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I have seen this in an Everett studio from about 60 years ago. I have no idea how long it will last. If I were to try to fix it, I would remove tension in the treble and see if the plate bolts could be strengthened. But it is not worth trying, since I can find better quality pianos in better shape for free.


Semipro Tech
Re: Quiz Time...
kpembrook #2986997 06/02/20 12:03 PM
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I've fixed a couple of these. Let off the tension, remove screws, drill holes, apply epoxy, install bolts, wait for epoxy to cure, bring up to pitch. Can be easier than finding another piano and then moving two pianos, one to the landfill with that cost involved.


Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?

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