keyboard levelling

[Greg Newell]

Bruce,
         You're giving away my invention! I've been noodling this idea 
around for years but can't get past the problem of having to bend the key 
pins slightly for better alignment. The nicest thing about this idea is 
that leveling a set of keys might take about 10 minutes!!! As i really 
don't care much for the task of key leveling I like the idea.

Best,
Greg


At 08:52 AM 11/26/2004, you wrote:
>Hi List,
>This question is obvious to me, but I don't know the history of innovation in
>piano design.
>Has anybody tried a balance rail pin which screws in and out of the balance
>rail, with micro-thread like tuning pins, to adjust it's height.
>A flange at the bottom on which sits one felt punching and then the key,
>which goes up and down when adjusted from the top. Has to be quicker, easier
>and more accurate.
>Bruce Browning-The Piano Tuner.
>
>
>Isaac Sadigursky <irs.pianos@earthlink.net> said:
>
> > Hi,everybody! regarding leveling the keys i'm surprised nobody had
>mentioned the possibility of leveling them "by ear",just the way blind
>technicians do. when straightedge or my favorite L-shaped aluminum
> >  is covering 1-1.5 octaves,just tapping the keys from the buttom will
>produce different sounds depending on the gap and then it is your judjment
>what thickness paper punching to insert. I had observed this technic in one
>of the convention classes for blind tuners years ago. It woyks! best of luck.
>isaac
> > P.s> the list is very addictive.. i'm thrilled to see all familiar names
>and appreciate wealth  of information and knowledge. Happy Thanksgiving to
>everyone!
> >
> > ----- Original Message -----
> > From: Stéphane Collin
> > To: Pianotech
> > Sent: 11/22/04 5:55:34 AM
> > Subject: Re: keyboard levelling
> >
> >
> > Hello Quentin, David and list.
> >
> > Strange, I find it much easier to appreciate a straight line in the keys
>when viewed from the side of the keyboard, than to appreciate the individual
>distance from the keys to a stick placed above them (certainly if that
>distance is small).  Also, only by eye can I pound three informations : the
>alignement of the underside of the fronts of the keys (supposed of course
>that they are perfecly evenly cut, which is nearly always the case), the
>alignment of the underside of the keytops, and the alignment of the upside of
>the keytops (which, if ivory and old, can have altered thicknesses due to
>wear which would induce some severe leveling errors when regulated with the
>stick).
> >
> > And, when it comes down to less than 0.16 mm difference between the level
>of adjacent keys (0.08 mm is the thickness of the smallest balance rail
>punchings I use, and I suppose here that the balance hole is approximately in
>the middle of the key length), which difference I'm sure anyone can see, I
>believe that the discrepencies in the other parts of the action plus the
>discrepencies in string height and the discrepencies in the apparent bore
>distance of the used hammers are all of greater consequence (and concern) to
>the regulation.
> >
> > Best regards.
> >
> > Stéphane Collin.
>
>
>
>--
>
>
>
>_______________________________________________
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Greg Newell
Greg's piano Forté
mailto:gnewell@ameritech.net