PianoDisc Installation Guide 55
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Step 31: Checking key height
The key height was previously measured and recorded. This measurement
must now be taken again and a careful comparison made between the two
measurements. If there is a difference, insert cardboard shims, 1/2” (13 mm)
wide, under the key rest felt to bring the key height back to its original
measurement. Occasionally, cutting of the key rest felt is what causes the front
of the keys to be higher. The only correct remedy is to add cardboard shims to
the bottom of the key rest felt.
Step 32: Action regulation procedure
The PianoDisc system will perform optimally when the piano action is
operating at the manufacturer’s specifications. The following items represent a
typical regulation checklist.
Adjust the following:
• Bed keyframe.
• Align hammers to strings.
• Align whippens to hammer knuckles.
• Align and square back checks to hammer tails
• Lubricate action.
• Adjust whippen spring tension. (Repetition spring)
• Align and position jacks.
• Repetition lever height (winking jacks).
• Hammer blow distance.
• Let off.
• Drop height.
• After touch.
• Back Check (checking).
If all adjustments are set correctly, after touch has a movement of
approximately 1/16” (1.5 mm) after drop.
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