---------------------- multipart/mixed attachment --part1_1e8.d0f863.2b6f4fdf_alt_boundary In a message dated 2/2/2003 2:54:41 PM Pacific Standard Time, Erwinspiano=20 writes: > Subj: Re: Bearing difference on different soundboards=20 > Date: 2/2/2003 2:54:41 PM Pacific Standard Time > From: <A HREF=3D"mailto:Erwinspiano">Erwinspiano</A> > To: <A HREF=3D"mailto:oleg-i@wanadoo.fr">oleg-i@wanadoo.fr</A> >=20 >=20 >=20 > In a message dated 2/2/2003 7:36:12 AM Pacific Standard Time,=20 > oleg-i@wanadoo.fr writes: >=20 > >> Subj: RE: Bearing difference on different soundboards=20 >> Date: 2/2/2003 7:36:12 AM Pacific Standard Time >> From: <A HREF=3D"mailto:oleg-i@wanadoo.fr">oleg-i@wanadoo.fr</A> >> To: <A HREF=3D"mailto:Erwinspiano@aol.com">Erwinspiano@aol.com</A> >> Sent from the Internet=20 >>=20 >>=20 >>=20 >> Thanks much , a very good view. >> =20 >> I understand that if we see, for instance 1/4 inch crown from below the=20 >> board, that does not really mean that having 1/4 distance bearing at the=20 >> string rest will absorb the whole crown, it depends of the back string=20 >> length vs. the speaking length. >=20 >=20 > >>That's right it won't absorb it all if there is an strength to resist.= =20 > However in a very flexible board it could completely deflect under the=20 > load. >=20 > >> =20 >> Do you use this as a "rule of thumb" , or do you go thru that computation= =20 >> about rear length to know how much distance is allowed before the board=20 >> reverse crown ? (as suggested by Nick Gravagne in the articles he write) >=20 >=20 > Nick printed an article about how to compute angle of deflection with n= o=20 > load but it doesn't take into account the amount of soundboard squash as=20 > the strings go on. I use a pre-stressing of the board method of bearing=20 > which is described very thoroughly in the archives or read august 1995 ptj= =20 > by John Hartman "The effects of downbearing on tone" A must read. Actuall= y=20 > four articles. >=20 > >> =20 >> The basic idea of my original post is that as we aim for internal tension= =20 >> in the board to produce a good tonal response, we may use the more=20 >> appropriated process when bearing, and that the bearing on cc crowned=20 >> board with nod add that tension (at last in the bass and medium), while o= n=20 >> rib crowned boards, internal tension is very low before down bearing is=20 >> applied (unless it is build when you glue the board on its perimeter. >=20 >=20 > >>I don't understand the thought here. I'm sorry could you clarify. >=20 > >> =20 >> I am very far from truth, or just a little bit .>)=20 >=20 >=20 > >>You're on the right track my friend >=20 > >>=20 >> We too see bearing load applied regularly but without relation to crown=20 >> often, and often too I see too much bearing in the killer zone, that tend= =20 >> to deform even more the panel. The Bob Grihalva add on seem to help well= ,=20 >> and the result is very clear (cleaner tone and better sustain). >=20 >=20 > >>>Me too. What's a Bob Grihalva add on. > Can we post our e-mails on caut for the benifit of others. It's completel= y=20 > up to you .It's OK with me except delete the refrence to Stephens secret=20 > device. >=20 > >> =20 >>=20 >> Have a nice Sunday >=20 >=20 > ... And too you---Dale Erwin > Finally SUNNY and warm after a month of rain and fog. Almond trees in=20 > bloom and simply Glorious!!!!!!!!!!!!!! ^68 degrees Come visit sometime.=20 > Extra room here. 2 hours from yosemite. >=20 > >> =20 >> Stephen is looking for a good place where to have his eyelets made=20 >> actually they are too expensive to be sold. his string rests are tunable= =20 >> on a 3mm zone (1.5 high,1.5 down) , and are 5mm tall, but as they have to= =20 >> be installed on a metal support to be moved, the final height is more of=20= a=20 >> Steinway aliquot scale actually. >> =20 >>=20 >> Best Regards, form snowy Paris ! >> =20 >> Isaac OLEG >>=20 >> Entretien et r=E9paration de pianos. >>=20 >> PianoTech >> 17 rue de Choisy >> 94400 VITRY sur SEINE >> FRANCE >> tel : 033 01 47 18 06 98 >> fax : 033 01 47 18 06 90 >> cell: 06 60 42 58 77=20 >>=20 >>=20 >> >>> -----Message=20 >>>=20 >>=20 >=20 --part1_1e8.d0f863.2b6f4fdf_alt_boundary An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/c2/15/85/d2/attachment.htm --part1_1e8.d0f863.2b6f4fdf_alt_boundary-- ---------------------- multipart/mixed attachment An embedded message was scrubbed... From: Erwinspiano@aol.com Subject: Re: Bearing difference on different soundboards Date: Sun, 2 Feb 2003 17:54:41 EST Size: 15405 Url: https://www.moypiano.com/ptg/caut.php/attachments/5f/4b/bf/56/attachment.eml ---------------------- multipart/mixed attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC