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#2692049 11/26/17 01:38 AM
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Soi I tune my own piano, one thing I notice is that after I finish my tuning today, at night, when the temperature becomes cold, it all go sharp. Does that mean my piano is not good anymore? Like I know temperature can affect the tuning stability, but it's not that quick? Like only a few hours and they all go out of tune.


Thanks,

James

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Hi James,

What is the piano?
How much is the temperature changing?
How experienced a tuner are you?


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Hi, thank you for your reply!
The piano is kawai GM10-k baby grand
The temperature probably change from 76 to 60 Fahrenheit
And I have tuned like maybe 50 times. For two years

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Not much detail to figure out but I would guess it is probably a mix of not setting the pins properly when you tune and also you will have to stabilize relative humidity (RH) around the piano.

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Originally Posted by James Guo

Soi I tune my own piano, one thing I notice is that after I finish my tuning today, at night, when the temperature becomes cold, it all go sharp. Does that mean my piano is not good anymore? Like I know temperature can affect the tuning stability, but it's not that quick? Like only a few hours and they all go out of tune.

The piano is kawai GM10-k baby grand
The temperature probably change from 76 to 60 Fahrenheit
And I have tuned like maybe 50 times. For two years


Strings react immediately on temperature changes. That is how Don Gilmore´s self tuning piano works.
A difference of 16 degrees is pretty large and explains enough that the pitch is going sharp noticeably.
I would recommend to keep the temperature constant.

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I agree with Mr. Stopper. The first time I had to tune in an outdoor venue, I was shocked how bad the tuning sounded on a piano that was in a room where the temperature increased just 15 degrees from the start to the finish of tuning it. The pianos started sharp in the cold morning weather, went flat by the mid-late afternoon, and then started drifting sharp again by the evening’s concert.


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Placing your fingers near the strings when dropping in a mute can cause a several cent temporary error.

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Hi, thank you for the reply. Is there any tutorial about setting the pin? I I'd do downward movement when tuning the pins...

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Originally Posted by prout
Placing your fingers near the strings when dropping in a mute can cause a several cent temporary error.

As can breathing into the piano!

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Chances are you are not setting the pin properly -



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Originally Posted by Bob
Chances are you are not setting the pin properly -

With a temperature difference of 16 degrees, pin setting is probably a negligible factor.

Kees

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Yes, this is not a pin setting issue. Piano strings always go sharp when cooled. Fortunately, they normally go right back where they were when they warm up again!

However, if the unisons sound out of tune, then that would be a pin setting / tuning technique issue. The temperature induced changes tend to move the strings together - fortunately! - so that the piano does not sound bad. But it will measure sharper.

Octaves will not match well after the pitch change because different string sizes and lengths will react differently.

I sometimes demonstrate the pitch change with temperature for customers by rubbing one string of an in-tune treble unison with my finger. Just rub one string . . the unison will go badly out of tune. Then you can wave your hand over the unison (fanning it to cool down the one warm string) and 'magically' make the unison go back in tune. :-)


Don Mannino, MPA
Kawai America

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