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#2099084 - 06/09/13 01:25 AM Defective upright piano pin
Maximillyan Offline
1000 Post Club Member

Registered: 06/12/11
Posts: 1793
Loc: KZ

In rare cases, the piano factory can install defective pins. There are burr on the invisible of part pin which placed in a pinblock. It's was the reason that in the piano name "Prelude" 1967 a sound loose pitch below required standard. When you tuning through the short term it's not let get right tone and sounded phony. So what happened?

The thing is that the manufacture in the factory a piano tuner technicianed it's . The hammering 'our' pin to the desired height, there was a partial destruction of the wooden bush and hole of pinblock. There are an unexpected grooves or anything so. The friction force between breaking down wooden part and pin was loose. As a result no necessary payload for pin . My advice is that if you decide that one of the pins does loose, and decided to set a cardboard shim, make sure the pin has a similar defect. Otherwise you run the risk of setting the shim under the pin again not achieve the desired result.

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#2099386 - 06/09/13 03:59 PM Re: Defective upright piano pin [Re: Maximillyan]
bkw58 Offline

Silver Supporter until December 19, 2014


Registered: 03/14/09
Posts: 2006
Loc: Conway, AR USA
Hi Max:
A few questions, please.
1. Is 'Kemble' or 'Yamaha' indicated anywhere on the harp or fallboard? Is there a serial number?
2. Are the burrs visible to you? If not, then how did you test for presence of these?

Thanks,


Edited by bkw58 (06/09/13 04:23 PM)
Edit Reason: clarity
_________________________
Bob W.
Retired piano technician
Conway, Arkansas
www.pianotechno.blogspot.com

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#2100091 - 06/10/13 04:34 AM Re: Defective upright piano pin [Re: bkw58]
Maximillyan Offline
1000 Post Club Member

Registered: 06/12/11
Posts: 1793
Loc: KZ
Originally Posted By: bkw58
Hi Max:
A few questions, please.
1. Is 'Kemble' or 'Yamaha' indicated anywhere on the harp or fallboard? Is there a serial number?
2. Are the burrs visible to you? If not, then how did you test for presence of these?

Thanks,


Hi,Bob

1.I'm never seen alive 'Kemble'
'Yamaha' on the harp (right) where hight sound. But I seen a serial number only grand.
or fallboard. I don't know.



2. That's the dog is buried. We are unfortunately not only did not see it, but do not know about the existence of such a burr on body of a pin. In the video is a burr on the end of a pin.
Even when it is press-fitted in the factory it's partly ruined wooden surface bush and holes of pinblock .
I found this pin only because the lady owner of the piano, she called a week later after my visit. She said: "You spoiled my piano. One key gives disgusting sound!"
I came in and made sure she was right. I corrected it, apologized for the inconvenience caused and would like walk to my home. As at the time when the lady start play but the string "screeched." It was the same pin.
I realized that the problem in this pin. I would have to put 3 mm. shim of cardboard, when carefully examined the pin and saw a burr on it's body. Then I decided to first put the cardboard shim.4, 5 mm. I left the pin on memory, but I'd instead set a new pin here. The piano works well for more than seven years. Corrugated cardboard works wonders " in golden hands" if solution of the problem is repair of ill wooden hole. I actually restored the hole which was spoiled groove from defective pin.
Here's a song-tale.
Good luck!
Regards, Max

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#2100191 - 06/10/13 09:42 AM Re: Defective upright piano pin [Re: Maximillyan]
bkw58 Offline

Silver Supporter until December 19, 2014


Registered: 03/14/09
Posts: 2006
Loc: Conway, AR USA
Thanks, Max.
_________________________
Bob W.
Retired piano technician
Conway, Arkansas
www.pianotechno.blogspot.com

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#2100704 - 06/11/13 12:21 AM Re: Defective upright piano pin [Re: bkw58]
Maximillyan Offline
1000 Post Club Member

Registered: 06/12/11
Posts: 1793
Loc: KZ
Originally Posted By: bkw58
Thanks, Max.

Thank you, Bob
This shooted video with one single goal. If there are faulty pin of piano as "our" with the burr, you should carefully check each before an installation. Otherwise we have the risk lose of produce quality when we makes installation of pins. We can have a negative result within a short period of time.
Be careful when testing installed pins. And the piano will work flawlessly.


Edited by Maximillyan (06/11/13 12:24 AM)

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