11/11/03oppor-tune-ist piano service1 piano scale evaluation a discusion of restringing preparation
TRANSCRIPT
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11/11/03 Oppor-TUNE-ist Piano Service 1
PIANO SCALE EVALUATION
A DISCUSION OF RESTRINGING PREPARATION
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11/11/03 Oppor-TUNE-ist Piano Service 2
AGENDA
• Scale copy
• Benefits of Evaluation – Specification
• Evaluation Elements
• Specifications to the String Manufacturers
• Data Capture
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11/11/03 Oppor-TUNE-ist Piano Service 3
SCALE COPY
• Paper patterns
• Duplication
• Few known parameters– Tension– Inharmonicity– Expansion– Volume/Impedance
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11/11/03 Oppor-TUNE-ist Piano Service 4
Benefits of Scale Evaluation
• Control winding material changes
• Better match to Historic Characteristics
• Smooth out parameter curves
• Correction of termination nuances or replacement of termination points.
• Stress leveling to aid stability
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11/11/03 Oppor-TUNE-ist Piano Service 5
Winding Material Changes
• Most common winding material today is soft copper.
• Difference in densities results in different volume, tension, inharmonicity
Steel->Copper
Silnic->Copper
Aluminum->Copper
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11/11/03 Oppor-TUNE-ist Piano Service 6
Better Match to Historical Characteristics
• Change of core or wrap to control – Tension– Volume/impedance– Expansion – Pitch change
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11/11/03 Oppor-TUNE-ist Piano Service 7
Improve Parametric Consistency
• Inharmonicity Curves
• Tension Patterns
• Volume Curves
• Across the breaks
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11/11/03 Oppor-TUNE-ist Piano Service 8
Tension
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11/11/03 Oppor-TUNE-ist Piano Service 9
Volume
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11/11/03 Oppor-TUNE-ist Piano Service 10
Inharmonicity
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11/11/03 Oppor-TUNE-ist Piano Service 11
EVALUATION ELEMENTS• Speaking Length
• Core / Wrap
• Material
• Length of Wrap
• Wrap Step
• Exposed core length
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11/11/03 Oppor-TUNE-ist Piano Service 12
Change in Material
Material Tension Volume Inharmonicity
Change of Material has greatest effect on all three major parameters
Steel 200.243 29.102 0.198
Copper 224.151 32.576 0.184
Aluminum 80.701 11.728 0.391
Silver-Nickel 226.542 32.924 0.183
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11/11/03 Oppor-TUNE-ist Piano Service 13
Speaking Length
Speaking Length Tension Volume Inharmonicity
Tension and Volume are directly proportional to length, Inharmonicity is inversely proportional.
53.25 233.931 33.279 0.17
53.125 232.834 33.201 0.172
53 231.74 33.123 0.173
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11/11/03 Oppor-TUNE-ist Piano Service 14
Core
Core Tension Volume Inharmonicity
All three parameters are directly proportional. Greatest effect on Inharmonicity
51 232.943 33.217 0.19
49 232.834 33.201 0.172
47 232.731 33.186 0.155
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11/11/03 Oppor-TUNE-ist Piano Service 15
Wrap
Wrap Tension Volume Inharmonicity
Tension and Volume are directly proportional to length, Inharmonicity is inversely proportional. Greatest effect on Inharmonicity
235 243.011 34.652 0.167
230 232.834 33.201 0.172
225 222.877 31.781 0.176
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11/11/03 Oppor-TUNE-ist Piano Service 16
Step
Step Tension Volume Inharmonicity
Inharmonicity is greatly affected by step length. Directly Proportional
0.75 222.877 31.781 0.8
0.5 222.877 31.781 0.524
0.25 222.877 31.781 0.318
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11/11/03 Oppor-TUNE-ist Piano Service 17
Exposed Core
Exposed Core Tension Volume Inharmonicity
Inharmonicity is greatly affected by exposed core length. Directly Proportional.
1 222.877 31.781 0.358
0.75 222.877 31.781 0.253
0.5 222.877 31.781 0.18
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11/11/03 Oppor-TUNE-ist Piano Service 18
String Specifications
• Core
• Wrap Diameter
• Wrap step
• Loop to start of wrap
• Length of wrap
• Tolerances
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11/11/03 Oppor-TUNE-ist Piano Service 19
Data Capture
• Speaking Length
• Core & Wrap
• Bridge to start of wrap
• V-Bar to start of wrap
• Bridge to loop
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11/11/03 Oppor-TUNE-ist Piano Service 20
Reference Illustration
Speaking Length
VbarBridgeStep
Tail
Loop to Wrap
Length of Wrap
Core Diameter
Wrap Diameter
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11/11/03 Oppor-TUNE-ist Piano Service 21
THANK YOU
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