KS 20: Key Leveling on the Bench
Key Leveling on the Bench: In the piano, we made 1 and 88 leveling samples first (where case parts are at hand to consult) and then turned up their Keysteps to...
Christopher Brown |
Chris Brown RPT
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KS 19: Recording Spacing Scale and Strike Heights
Recording Spacing Scale and Strike Heights: Setup now complete, record the hammer spacing scale and template heights at strike. The hammer spacing scale comes from the spacing of strings along...
Christopher Brown |
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KS 18: Strike Setup on the Bench
Strike Setup on the Bench: When the keyframe has been bedded on the bench to have the same shape it had in the piano, our strike samples will work. We took...
Christopher Brown |
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KS 17: Bedding Setup on the Bench
Bedding Setup on the Bench: Now that the action is positioned on the bench, shim the backrail to be stable. Do this with front punchings, placed every twelve to fourteen inches....
Christopher Brown |
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KS 16: Fixing Action Position on the Bench
Fixing Action Position on the Bench: Set up the action on a flat, stable surface. This will never be the same flat as the keybed, so don't worry about small imperfections....
Christopher Brown |
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KS 15: Strike Sampling
Strike Sampling: Strike is the three-dimensional target and principal index of grand regulating. It is the first line on the piano designer's drawing board. The keybed is a distance from it,...
Christopher Brown |
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KS 14: Bedding and Key Level Sampling
Bedding and Key Level Sampling: To turn a key into a bedding sample, remove its front punchings, install a Keystep, and turn that up to just touch. The key at...
Christopher Brown |
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KS 13: Preparing for Bedding, Key Level, and Strike Samples
Preparing for Bedding, Key Level, and Strike Samples: Choose which keys will be bedding samples, naturals only, one beside each glidebolt including hidden ones (glidebolts are the balancerail's points of...
Christopher Brown |
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KS 12: Solving Excessive Friction
Solve Excessive Friction: Friction is a necessary and useful component of piano action mechanics. Too much causes trouble in one direction and too little, trouble in the other. The best balance...
Christopher Brown |
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KS 11: Bedding and Action Elevations
Bedding and Action Elevations: Two requests for further thoughts came in this week: David Skolnick on "special problems created by a ‘collapsed’ rigid frame" and Alan Eder on "how to determine whether...
Christopher Brown |
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KS 10: Bedding the Balancerail
Bedding the Balancerail: There are three principal styles of grand keyframe balancerail - the stiff, Steinway/Mason & Hamlin style supported by adjustable glidebolts, the more flexible Asian style with glidebolts...
Christopher Brown |
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KS 9: Bedding the Frontrail
Bedding the Frontrail: So far, we have a clean keybed, an action with shanks off rest cushions and no excessive friction, screws not loose and no deal-breaking need for repairs,...
Christopher Brown |
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KS 8: Bedding the Backrail
Bedding the Backrail: How to proceed when a backrail tests positive for a gap? So far, with no excessive friction or need for repairs, the action has stayed together. Maybe it...
Christopher Brown |
