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#2220228 - 01/24/14 06:41 PM Key height above key slip
Davepost Offline
Full Member

Registered: 04/15/13
Posts: 137
Loc: Hudsonville, Western Michigan,...
Is there a standard measurement of the natural key above the key slip?
David Postma, Associate Member, PTG Lansing, Michigan Chapter. www.davepostma.com Conover 9 ft. 4" (Mason & Hamlin CC-1) Baldwin L, Baldwin M, Chickering 123 6 ft 6"

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#2220259 - 01/24/14 07:58 PM Re: Key height above key slip [Re: Davepost]
Ed Foote Offline
1000 Post Club Member

Registered: 05/03/03
Posts: 1452
Loc: Tennessee
Originally Posted By: Davepost
Is there a standard measurement of the natural key above the key slip?

The usual is to aim for a square appearance of the front when the key is at rest. Other considerations, more functional, are the depth of the front pin in the mortise and the fit of the fallboard. Depending on geometry and the fit of the fly parts, you would want to make sure that with a working key dip, the overhang of the key top doesn't hit the keyslip.

Edited by Ed Foote (01/24/14 07:59 PM)

#2220278 - 01/24/14 09:26 PM Re: Key height above key slip [Re: Ed Foote]
Jon Page Offline
Full Member

Registered: 03/13/09
Posts: 397
Loc: Harwich Port, Cape Cod, Massac...
Usually 20-22 mm above the key slip is in the ballpark. Samick is 20 and YC is 21. But mostly what Ed said.

Jon Page
Piano technician/tuner
Harwich Port, Cape Cod, Massachusetts, USA

#2221824 - 01/28/14 10:07 AM Re: Key height above key slip [Re: Davepost]
Mark Cerisano, RPT Offline
2000 Post Club Member

Registered: 01/24/10
Posts: 2280
Loc: Montreal, Quebec, Canada
This is how I set it:

Tops of A0 and C8 slightly lower than the cheek blocks.
Balance rail pins not below key button. (Not critical)
Front slightly rectangular in the wide direction.(Not critical)
Clearance with fallboard. (Press down lightly. Hammers or wippens should not move.)
Key lip doesn't hit keyslip. Press down hard. Should not touch or hear clicking.
Enough dip so that regulation is possible with a felt
punching and a some paper punchings for every key.

Also, for an old piano, you can sometimes see some discolouration on the key front that will give you an idea of the original key height.(Not critical)
Mark Cerisano, RPT


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