---------------------- multipart/alternative attachment In a message dated 10/17/03 9:40:50 AM, Erwinspiano@aol.com writes: >=20 > Michael >=20 > =A0=A0=A0=A0 The tone bell & =A0pulsator I asked John about are not the s= ame thing.=20 > The pulsator is merely a thin strip of maple about 25 mm wide by 7 mm thic= k by=20 > 6 cm long. Depending on the year this feature intersects 3 to 5=20 > ribs.=A0Looking under the piano at the board of a S&S B & C=A0you'll see i= t in the bass=20 > corner. It runs 90 Degrees to the ribs and is glued/dowelled to the ribs.=20= The ribs=20 > are also thinned out & seem to terminate somewhat=A0at this point even tho= ught=20 > he thinned out flatter portions extend to & are glued into notches in the=20 > rasten/inner rim.=A0As John said it appears to be an idea that functions l= ike a=20 > cutoff bar but I'm thinking it may have an effect hard to quantify. Surely= =20 > they had a reason. >=20 > =A0 The bell is just a plate stiffening device. A short beam from the bel= ly=20 > rail to the case in the same area would allow for another nose bolt that c= ould=20 > take the place of the bell. I cant say the bell has any effect in and of=20 > itself to influence tone but does stiffen the plate web where it attaches=20 > thereby influencing tone.=A0There must be a modest down force of the bell=20= bolt to do=20 > so which by the way will increase the downbearing a small amount (tone=20 > effect)=A0These bolts also seem to come loose from time to time and cause=20= a weird=20 > rattle. >=20 > =A0Does that help?--Dale >=20 >=20 This reference to the "bell" brings to mind a question I have long had. S&S=20 piano plates are sometimes billed as cupola plates. Does this refer to the=20 shape of the stress holes in the plate, or to Steinway's use of a shop cupol= a=20 furnace to produce sufficient amounts of molten iron for the larger plate ? ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5f/be/ec/0e/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC