Baldwin Accu-Just Hitch Pins--General Information

[Erwinspiano@AOL.COM]

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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
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> >>=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


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