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Reyburn Pianoworks action geometry analysis request form.
Fill out and submit this form for analysis of your grand piano action geometry. This service is FREE for Piano Technicians Guild members and any profesional piano technician or rebuilder.
Please note all measurements must be in millimeters. Key measurements made with a tape measrue may be rounded to the nearest 0.5 mm. Caliper measurements should be entered as they are read, at least include accuracy to 0.1 mm.
Tools needed:
1) Caliper (150mm is fine)
2) Tape measure with millimeter scale.
3) Small square, or block of wood which is perfectly square, less than 150mm.
4) Fine pencil, 0.8mm or 0.5mm mechanical is best but any sharp pencil will do.
5. PDF Geometry Directions. (lots of pictures!)
Please use a low tenor key which is fairly straight such as note 21 on a Steinway B or D, or note 27 on a smaller piano with 26 bass notes.
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email address:
confirm email:
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Your name:
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first:
last name:
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Country
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Your phone number:
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(optional) |
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Piano make
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examples: Steinway & Sons, Mason & Hamlin
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Piano serial number:
The serial number is usually on the plate under music desk, or on front of the keyframe for Steinways.
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Piano year built (if known - approximate)
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1. Key front to balance rail hole center:
Taken at key bottom with tape measure.
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mm
Use tape measure on a very straight key such as the first tenor key above the bass.
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2. Key front to capstan lift point:
At key bottom with tape measure. Use square to premark where capstan lifts wippen.
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mm
Use tape measure on same key as above.
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3. Key bottom to top of capstan:
Where square marks wippen lift.
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mm
Use caliper.
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4. Key shoe height at balance rail (if any):
Enter zero if none. Only measure if shoe is external (sticks out from key).
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mm
Use caliper.
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5. Wippen center to back of jack:
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mm
Use caliper.
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6. Wippen center to capstan lift point:
Draw pencil mark where capstan actually touches and lifts wippen.
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mm
Use caliper.
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7. Hammer shank center pin to center of hammer line:
Draw pencil mark with square on side of hammer at centers.
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mm
Use caliper.
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8. Hammer shank center pin to knuckle center (spline center):
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9. Hammer strike distance (hammer bore):
Use caliper. If hammer is worn, measure to original or new hammer tip (approximate with glued bushing cloth if using worn hammer).
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mm
Alternatively, if you will be installing new hammers, calculate correct hammer bore by subtracting hammer flange center pin height from string height (height from keybed)..
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10. Hammer shank knuckle size:
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Comments or questions
Let us know if you have any comments or questions about Reyburn Pianoworks or this service. Thank you!
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