Sohmer

[Erwinspiano@AOL.COM]

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In a message dated 3/21/2002 12:19:05 PM Pacific Standard Time,=20
nhunt@optonline.net writes:


> Subj:Re: Sohmer=20
> Date:3/21/2002 12:19:05 PM Pacific Standard Time
> From:<A HREF=3D"mailto:nhunt@optonline.net">nhunt@optonline.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
> Hi Newton

      The problem I have with the first method is that it doesn't take into=20
account the error that will be  read because of the almost always tapered  (=
=20
diaphramized) soundboard top. I.E. Masons,stwy and many others. It's possibl=
e=20
to get a positive reading even on a flat board.
       The string is of course, as you say, a better way but even then we ca=
n=20
only measure residual crown. Meaning what's left over after the crown has=20
been squashed down by new strings and there bearing force providing there is=
=20
any left to start with. Any way you go it can be a sticky wicket.
>>>>>>best>Dale Erwin>>>>>>

>=20
> One way to measure crown from the top side is to use a long stick, two
> looong screws and a dial indicator with a long plunger.
>=20
> Make it it to look like this         |___|___|.  You calibrate by adjust=20
> one
> of the screws so you get a zero      =D6    reading on the dial using a=20
> really
> flat surface.  If you use additional screws you can check at many
> location well into the treble.
>=20
> The other easy way is to use a thread on the board between the longest
> ribs.  Simple but a way even I can understand.
>=20
>         Newton


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