I think that because of the flex of the parts, the key hits the punching before letoff on strong blows. As a static or partial dynamic analysis, you are right. Keith On Mon, May 19, 2008 at 5:55 PM, Dan Reed <pianoarts at tx.rr.com> wrote: > Science please... > > The jack has escaped, the energy has been transfered, "then" the front rail > punching is contacted... > > Where is the science of how the tone is effected by a hard or soft landing? > > Dan > > > > On May 19, 2008, at 7:07 PM, Jon Page wrote: > > A conical Crescendo punching will focus the tone. >> >> Being a firmer punching there is less compression on a hard blow >> so the dip (after touch) is more even between pp and ff. >> >> The straight-sided Crescendo punchings do not have the same tonal focus >> effect but are an improvement over the standard woven punchings. >> >> At the KC Convention I tested these with a few people at hand. The >> straight-sided punchings improved the tone over the woven punchings >> and the conical-sided punchings were a tonal improvement over the >> straight-sided ones. The conical-shape or tapered sides do make a >> difference. >> >> If you turn it upside down the effect is negated. I've displayed this to >> customer's amazement. >> >> Recently, I received a fairly new studio upright in my shop. I noticed >> that there >> were voicing issues. When I disassembled it, there were woven >> conical/tapered f/r punchings. I knew what some of the voicing problem >> was... some punchings were >> inverted. I placed all the punchings with the narrow side up, problem >> solved. >> >> They are too firm for some pianos causing noticeable impact sound. >> On those pianos the pear green punchings work well. >> >> As for the 3/4" punchings, they do not offer as much support and can allow >> the key to rock side to side more easily than the wider ones. I would use >> these >> on a spinet or something else of no consequence. >> -- >> >> Regards, >> >> Jon Page >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20080519/1addb814/attachment.html
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