---------------------- multipart/alternative attachment In a message dated 1/21/2002 10:35:32 PM Pacific Standard Time,=20 pianobuilders@olynet.com writes: > Subj:Re: Baldwin Accu-Just Hitch Pins--General Information=20 > Date:1/21/2002 10:35:32 PM Pacific Standard Time > From:<A HREF=3D"mailto:pianobuilders@olynet.com">pianobuilders@olynet.com<= /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 > =20 > >> ----- Original Message -----=20 >> From: <A HREF=3D"mailto:Erwinspiano@AOL.COM">Erwinspiano@AOL.COM</A>=20 >> To: <A HREF=3D"mailto:pianotech@ptg.org">pianotech@ptg.org</A>=20 >> Sent: January 21, 2002 1:08 PM >> Subject: Re: Baldwin Accu-Just Hitch Pins--General Information >>=20 >>=20 >> In a message dated 1/21/2002 10:40:39 AM Pacific Standard Time, <A HREF= =3D"mailto:pianobuilders@olynet.com"> >> pianobuilders@olynet.com</A> writes: >>=20 >>=20 >> >>> Subj:Baldwin Accu-Just Hitch Pins--General Information=20 >>> Date:1/21/2002 10:40:39 AM Pacific Standard Time >>> From:<A HREF=3D"mailto:pianobuilders@olynet.com">pianobuilders@olynet.co= m</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 >>> Del=20 I think possibly you were confused about the order of subjects under=20 discusion over the weekend. They did get convoluted and went from one thing=20 to another. The Baldwin board specs were hashed out some and then it went on= =20 to the topic of setting crown in new boards, so you may not have picked up o= n=20 the sequential discussions of this thread. That's why your post struck me th= e=20 way it did. I didn't mean to necessarily relate those downbearing numbers to= =20 the baldwin system but to a fairly typical 60ft. crowned board with rib=20 dimensions the same or similar to what ever the original heights were. This=20 type of board is pretty common in shops across the country (as you know) and= =20 is probably where those asking the question will start at. Hence my reply.=20 Perhaps my post was confusing. The prestressing method itself was what I wanted to make a point of an= d=20 as you say the bearing values will change given a host of different factors.= =20 Although this method is old perhaps there other methods as well that I would= =20 certainly enjoy hearing discussed. I apologize for bristling a bit. The rest of you post was well taken an= d=20 clear enough. Best--Dale Erwin > >> >>>=20 >>> Dale, Carl, et al, >>> . >>>=20 >>> Mostly, how much loading any specific soundboard must have is a function= =20 >>> of how massive and how stiff the soundboard assembly is. This is not a=20 >>> universal constant. Dale=E2=80=99s string deflection numbers would not w= ork[at]=20 >>> all for one of our boards. As to whether they would work for one of=20 >>> Baldwin=E2=80=99s current boards=E2=80=94I cant say. With the Accu-Just=20= system Baldwin=20 >>> has used a fairly light crown radius=E2=80=94 >>>=20 Del--Just so it doesn't appear that you're dismissing my downbearing=20 deflection no. derived from the experience myself and others out of hand, le= t=20 me Re- > >> state that these no.s are real do work well in NON--REDESIGNED=20 >> soundboards, which I must point out most of us are doing. I think I was=20 >> fairly specific as to the type of replacement board application that thes= e=20 >> numbers do commonly work in.=20 >>=20 > No, I'm not dismissing them at all. And I'm certainly not dismissing your=20 > experience. I thought I was being pretty specific when I said your=20 > downbearing numbers wouldn't work for our soundboards. And they may not=20 > work for Baldwin boards--which is what the original discussion was about i= f=20 > I recall correctly. Anyway, my apology if I wasn't specific enough--I'm=20 > just trying to point out that these numbers are specific to the type and=20 > design of the boards you put in. They may or may not work well for the=20 > boards someone else puts in using some (perhaps only slightly) different=20 > procedure. Or some different combination of materials.=20 > =20 > There are lots of variables that go into setting up a soundboard system,=20 > including determining the amount of string loading on the soundboard. The=20 > numbers you and others are quoting are numbers that work well for you.=20 > You've done a lot of boards and you're comfortable with them. But they are= =20 > not universal numbers for all soundboards and for all pianos though they=20 > typically get used that way. When the question is asked, "How much=20 > downbearing should there be on a new soundboard?" I'm not sure we can=20 > answer without either asking or giving a bit more information, as you're=20 > doing below: > =20 > =20 >=20 > >>=20 >> These values of downbearing work well for me on 60ft. rib crowned=20 >> boards(treble radius are tighter) but with some modification of the syste= m=20 >> of prestressing, I suggest the procedure could be applied to many if not=20 >> most soundboard systems that exhibit some stiffness as they're being test= =20 >> loaded. Obviously totally flacid or under crowned systems woulf require a= =20 >> different approach. >> Perhaps you'd like to share what values you consider workable in a=20 >> non-redesigned rib crowned soundboard system ? Or in your design system=20 >> for that matter. >>=20 > I do so in classes I give on the subject. But without being able to=20 > illustrate and discuss the design of the soundboard the numbers wouldn't=20 > mean much. Let's just say that they have somewhat more flex in them than=20 > you're probably used to and they have somewhat more crown, hence the=20 > downbearing settings are quite a bit higher than you would use. > =20 > Del >=20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b2/18/be/d0/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC