Mason&Hamlin A board replacement

[Erwinspiano@AOL.COM]

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In a message dated 8/9/2002 5:14:28 AM Pacific Daylight Time,=20
mcpiano@globetrotter.net writes:


> Subj:RE: Mason&Hamlin A board replacement=20
> Date:8/9/2002 5:14:28 AM Pacific Daylight Time
> From:<A HREF=3D"mailto:mcpiano@globetrotter.net">mcpiano@globetrotter.net<=
/A>
> Reply-to:<A HREF=3D"mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF=3D"mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet=20
>=20
>=20
>=20
> Thanks for the info,
> Comments inserted below
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> >> -----Original Message-----
>> From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf O=
f=20
>> Erwinspiano@AOL.COM
>> Sent: 8 ao=FBt, 2002 11:06
>> To: pianotech@ptg.org
>> Subject: Re: Mason&Hamlin A board replacement
>>=20
>>=20
>> In a message dated 8/7/2002 5:35:26 PM Pacific Daylight Time,=20
>> mcpiano@globetrotter.net writes:
>>=20
>>=20
>> >>> Subj:Mason&Hamlin A board replacement=20
>>> Date:8/7/2002 5:35:26 PM Pacific Daylight Time
>>> From:<A HREF=3D"mailto:mcpiano@globetrotter.net">mcpiano@globetrotter.ne=
t</A>
>>> Reply-to:<A HREF=3D"mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>>> To:<A HREF=3D"mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>>> Sent from the Internet=20
>>>=20
>>>            Marcel
>>=20
>>=20
>>         It would be simple enough to discard the apron and move the bass=20
>> bridge forward as far as the plate will allow  which would allow the=20
>> backscale length some improvement. Yes, the bass strings would be a bit=20
>> shorter but you'd gain back scale length. The mono chord section which=20
>> needs it most desperately.=20
>> The plate doesn't leave much room for discarding the apron. I would at th=
e=20
>> most gain about 2 cm.
       Marcel
<>>>>>>>>>Yes but the backscale length is dreadfully short now so any length=
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is a help plus the rest of the bass could use it too. I'd make a solid bridg=
e=20
and undercut some or all the portion under the mono chords so that the end o=
f=20
the bridge doesn,t end up being glued so close to the rim. Set it up with o=20
bearing. Or all most

> >> =20
>>      On one of the two As I did last year I did what I call a partial=20
>> float at the end of the tenor bridge which was done by drawing a line fro=
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>> one end of the maple cap piece on the board to the other end, installing=20=
a=20
>> small rib on the bottom underneath the line and a thin maple strip over i=
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>> on the top for a little reinforcing. I made the cut after the auxiliary=20
>> ribs were on.
>>   =20
>> What thickness  was your bottom rib (was this one spruce in the bottom)=20
>> and the maple one on top?

>>>>>>>>>>Not thick 15 mm or less. Spruce on bottom. top cap about 3mm. It=20
wasn't notched to the rim either.
  By the way this is a very easy modification its building the rest of it=20
that's time consumning. know what I mean. It's also doing all the other=20
things like thinning the panel ,choosing an overall adequate panel=20
thicknesses thinning more in the tail and leaving adequate thickness in the=20
treble. The ribs in the bottom need some beefing up a couple mm or so. don't=
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change the no. of ribs less you have a real good plan as to why. The As a=20
good piano. Crown your ribs at least 60ft. in the bottom and more into the=20
treble etc. etc. etc.
             Best>>>>Dale Erwin>>>>

> >> =20
>>     I'm not advocating any one do this but just sharing my own journey.=20
>> I'm sure there are other ideas and methods that have more merit "floating=
"=20
>> around in cyber space.
>>       Dale Erwin
>>   =20
>>=20
>>=20
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