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Problem "bridge turned", torque maybe #2750407
07/09/18 10:39 AM
07/09/18 10:39 AM
Joined: Mar 2010
Posts: 620
Germany
B
BerndAB Offline OP
500 Post Club Member
BerndAB  Offline OP
500 Post Club Member
B

Joined: Mar 2010
Posts: 620
Germany
Hello fellow technicians,

I must confess first that I am technician too - no piano tech, but a mechanical engineer.

There is a lady in Munich with an old Steinway B who has some problems with the bridge.

The bridge ist said as being "turned" , there might have come a torque to the bridge while tensioning the strings. (Pls. excuse my lousy english, it is far from being perfect.)

How is this measured, or how can this be seen, when the piano is "under tension"?

Can a bridge be "hammered back" while havin tension? Is it necessary to fully loosen the strings? Or is there a way intermediate?

Is a repair method to loosen all strings, to give the bridge a "pre tension" in direction hitch pins, and then have it come forward while re-tensioning?

How much work is it, provided that the bridge is glued properly and does not have left contact to soundboard?

Or are there other clues, hints , tricks, circumstances which have to be watched closely...?...

Best regards for any helpful answers.

Bernd B


Pls excuse any bad english.

D 1877 satin black plain
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Re: Problem "bridge turned", torque maybe [Re: BerndAB] #2750412
07/09/18 11:04 AM
07/09/18 11:04 AM
Joined: Apr 2010
Posts: 1,920
Michigan
K
kpembrook Online content
Platinum Subscriber
kpembrook  Online Content
Platinum Subscriber
K

Joined: Apr 2010
Posts: 1,920
Michigan
Bernd,
What you describe is what we generally call a "rolled" bridge.

This is an age/stress caused change of state in the soundboard and the bridge came along for the ride.

This is not something that can really be repaired, although sometimes steps can be taken to reduce the tonal symptoms.
The real answer is replacement of soundboard and bridge -- or at least recapping of the bridge.

The critical consideration is not the description of the state of the bridge but of the current tone of the piano. Is it weak in the mid-treble area?
If there is no tonal issue (probably is), then there is no issue at all.

You English is quite good. Don't worry about it.

--Keith


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, Piano Technicians Journal
Re: Problem "bridge turned", torque maybe [Re: BerndAB] #2750413
07/09/18 11:04 AM
07/09/18 11:04 AM
Joined: Jun 2003
Posts: 26,701
Oakland
B
BDB Offline
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BDB  Offline
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B

Joined: Jun 2003
Posts: 26,701
Oakland
I do not understand the problem. If there is a problem, a technician would be needed to repair it. That is who should be asked about it.

All I can say is that a Steinway B has a continuous bridge, so it is not likely that there would be a problem with the bass.


Semipro Tech
Re: Problem "bridge turned", torque maybe [Re: BerndAB] #2750620
07/10/18 03:15 PM
07/10/18 03:15 PM
Joined: Mar 2010
Posts: 620
Germany
B
BerndAB Offline OP
500 Post Club Member
BerndAB  Offline OP
500 Post Club Member
B

Joined: Mar 2010
Posts: 620
Germany
thx to all participants for helpful advices.

Bernd AB


Pls excuse any bad english.

D 1877 satin black plain
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