---------------------- multipart/alternative attachment
Ron,
would you please give us a heads up when this CD is being=20
released? Thanks!
Greg
At 04:42 PM 2/14/2005, you wrote:
>Hi all,
>
>Ron N wrote;
>
>>No, because you aren't relying solely on panel compression for that=20
>>stiffness increase. You can make the ribs as stiff or as flexible as you=
=20
>>like to build in whatever spring rate you think you want with the RC&S=20
>>assembly. In the RC&S assembly, you can also easily produce considerably=
=20
>>different spring rates in different parts of the scale.
>
>Indeed, the spring rate must vary throughout the scale. It must have a=20
>lower rate in the bass to allow wider panel excursions, and stiffer in the=
=20
>treble to accommodate the much small amplitude of panel movement required=
=20
>for a given sound pressure level.
>
>This is the second time that Ron N has mentioned spring rates and it is a=
=20
>most important point IMO. The spring rate, mass combination/distribution=20
>and the hysteresis characteristics of the sound board assembly (which=20
>Sarah Fox mentioned in her thoughtful post) will come together to produce=
=20
>the resultant tonal characteristics, to a large extent.
>
>Rick B wrote;
>
>>Oh it holds up,,, as far as the reasoning goes. But stiffness, as you=20
>>know, and for that matter spring rate is not all one is concerned with.
>
>Agreed, it isn't.
>> You have the mass side of the equation to figure in.... at the very=
least.
>
>Yes we do, plus hysteresis.
>
>> You can easily achieve similar stiffness levels I would assume... with=
=20
>> two different assemblies ( a CC and an RC&S) at least for a given RH,
>
>This should be do-able.
>
>> but achieving that and at the same time the same stiffness to mass=20
>> relationships is another matter.
>
>It is not a 'another matter'. If you have determined a certain spring rate=
=20
>but would like more mass you can use more, lower and wider ribs, and your=
=20
>mass will be increased at a given stiffness. If you want less mass for the=
=20
>same stiffness (spring rate) you can use less, deeper and narrower ribs.=20
>Its a simple matter to arrive at the spring rate and mass relationship=20
>required, using RC construction. Furthermore, I believe that the stiffness=
=20
>of ribs should ideally be varied along their length. The rib should be=20
>stiffer under the bridges (where most CC boards collapse in short order),=
=20
>getting gradually weaker as we move from the bridges to the ends of the=20
>rib. The tapering of rib strength is a cake walk when building an RC& S=20
>board. While the CC building school can contour the panel thickness to=20
>increase the stiffness under the bridges, it is more of a 'blunt=
instrument'.
>
>>So varying panel thickness to achieve similar stiffness would probably=20
>>insure dissimilar mass.
>
>Varying the panel thickness, to achieve a certain level of stiffness, has=
=20
>been the most usual method of controlling stiffness for the CC building=20
>school. The hysteresis loss matter, which Sarah raised, is an interesting=
=20
>one as well.
>
>At 2:28 PM +0100 14/2/05, Richard Brekne wrote:
>>
>>When someone makes a RC&S board and puts it into a Steinway D rim, and=20
>>puts the darned thing on the stage of Carnegie Hall and fools everyone=20
>>with its <<authentic Steinway sound>>
>
>Outside of the extensive 'cloning' school, who would want to build an=20
>authentic Steinway sound - I certainly don't? And I don't expect to see an=
=20
>RC&S boarded instrument on the Carnegie Hall concert platform anytime=20
>soon. I certainly have no interest in fooling anybody. Besides, if you=20
>built a different design into a Steinway piano and failed to acknowledge=20
>it on the piano, you'd have the S&S legal team trying to put you out of=20
>business ASAP. I and a number of others have experience this potential=20
>drama first hand. Fortunately, I always fix a label to the piano stating=20
>any modifications, so their team had nothing to stand on in 1996. I've=20
>already built an RC&S board into a D and, as expected, it certainly didn't=
=20
>sound like a Steinway.
>
>I think folks should stop worrying about the risk of RC & S construction=20
>causing the sky to fall in. Let's give the idea a serious evaluation. At=20
>present the mainstream manufacturers have joined in, in condemning the RC=
=20
>& S idea. There was a time when shaped ribs were being similarly=20
>condemned. Today, many manufacturers are profiling their ribs. Some are=20
>even doing it to the actual ribs, and not just in the brochure.
>
>Today is the second recording day (of 5) of Scott Davie's second CD to be=
=20
>recorded on an Overs 225 piano. In this case the piano is the RC&S boarded=
=20
>Overs no. 5 (the samples on the website are of no. 3). For this CD, Scott=
=20
>is recording Massorgsky's Pictures at an Exhibition and Rachmaninoff's=20
>first piano sonata (a monster work). It should be available for sale=20
>sometime around mid year 05. Yesterday, the recording team spent the first=
=20
>2.5 hours getting the recorded sound to a close match of the piano. Five=20
>of us finally agreed on the balance, Scott Davie (recording artist), Lyle=
=20
>Chan (ABC Classics executive producer), Thomas Grubb (producer), Christian=
=20
>Huff-Johnston (engineer) and myself as piano technician. Scott recorded=20
>Pictures from memory yesterday. I was most impressed when Tom would make=20
>suggestions to Scott," from bar *** to ***", and he would just pick up=20
>from that point for another 'take' without referring to the score. Its=20
>wonderful to observe real talent in mid-career.
>
>Ron O.
>
>--
>OVERS PIANOS - SYDNEY
> Grand Piano Manufacturers
>_______________________
>
>Web http://overspianos.com.au
>mailto:ron@overspianos.com.au
>_______________________
Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20
---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/bc/19/42/27/attachment.htm
---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC