 |
Welcome to the Piano World Piano Forums
Over 3 million posts about pianos, digital pianos, and all types of keyboard instruments.
Over 100,000 members from around the world.
Join the World's Largest Community of Piano Lovers
(it's free)
It's Fun to Play the Piano ... Please Pass It On!
|
|
|
|
64 members (brennbaer, AndyOnThePiano2, APianistHasNoName, AlkansBookcase, Charles Cohen, BillS728, 36251, 11 invisible),
2,036
guests, and
349
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
Joined: Mar 2008
Posts: 9,230
9000 Post Club Member
|
OP
9000 Post Club Member
Joined: Mar 2008
Posts: 9,230 |
Against string breakeage, and is not only used for acoustical and stability reasons. ? You have 30 minutes 
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.!
|
|
|
|
|
Joined: May 2003
Posts: 2,845
2000 Post Club Member
|
|
2000 Post Club Member
Joined: May 2003
Posts: 2,845 |
Greetings,
Assuming equal torque, the springy pin will move more at the coil than a stiffer one before movement in the block occurs. The greater the movement, the greater the stress at the most highly stessed part of the string, i.e. the very bottom of the coil. The greater the stress the more breakage.
Regards,
|
|
|
|
|
Joined: Mar 2008
Posts: 9,230
9000 Post Club Member
|
|
OP
9000 Post Club Member
Joined: Mar 2008
Posts: 9,230 |
good point. .. I ll think about. thanks for participating my guess have more to do with energy use, it sound better if the tones is well send toward the case\ thru pinblock and then saturation moment is later... also I see the tuning pin as a resilient fixture it may adbsorb some of the impact
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.!
|
|
|
|
|
Joined: Aug 2011
Posts: 2,925
2000 Post Club Member
|
|
2000 Post Club Member
Joined: Aug 2011
Posts: 2,925 |
To add to Ed's response, the coil loosens with pitch lowering. You can observe the string at the bottom coil move away from the pin.
"Imagine it in all its primatic colorings, its counterpart in our souls - our souls that are great pianos whose strings, of honey and of steel, the divisions of the rainbow set twanging, loosing on the air great novels of adventure!" - William Carlos Williams
|
|
|
|
|
Joined: Mar 2008
Posts: 9,230
9000 Post Club Member
|
|
OP
9000 Post Club Member
Joined: Mar 2008
Posts: 9,230 |
To add to Ed's response, the coil loosens with pitch lowering. You can observe the string at the bottom coil move away from the pin. I dont get that, I know the harpsichord strings break more when we are lowering the pitch because a fragile part of the wire is suddendly exposed to tension, but never noticed coils opening when tuning, on a piano. I am un sure what you call "lowering the pitch", how much cts ? If no rendering, the lack of tension in the front of the pin can produce that, never noticed ..
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.!
|
|
|
|
|
Joined: May 2003
Posts: 2,845
2000 Post Club Member
|
|
2000 Post Club Member
Joined: May 2003
Posts: 2,845 |
Greetings,
The point at which the wire is totally in contact with the pin is the point of greatest stress. This section must withstand not only the speaking length tension, but also, the extra tension required to overcome the friction between it and the speaking length,(felt, agrafffes, etc). Add to this the extra tension we use to set pins, and the stress at the coil becomes the highest in the string. The reason for the breakage is also due to the wire's outer circumference being stretched beyond its deformation limit, creating micro-cracks in the surface.
I don't know if the heavier gauges would maintain that deformation when lowered, unless the lowering were enough to remove tension.
REgards,
|
|
|
|
Forums43
Topics223,390
Posts3,349,223
Members111,632
| |
Most Online15,252
Mar 21st, 2010
|
|
|
|
|
|
|
