<div>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.</div> <div>Keith<br><br></div> <div class="gmail_quote">On Mon, May 19, 2008 at 5:55 PM, Dan Reed <<a href="mailto:pianoarts@tx.rr.com">pianoarts@tx.rr.com</a>> wrote:<br> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Science please...<br><br>The jack has escaped, the energy has been transfered, "then" the front rail punching is contacted...<br> <br>Where is the science of how the tone is effected by a hard or soft landing?<br><font color="#888888"><br>Dan</font> <div> <div></div> <div class="Wj3C7c"><br><br><br>On May 19, 2008, at 7:07 PM, Jon Page wrote:<br><br> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">A conical Crescendo punching will focus the tone.<br><br>Being a firmer punching there is less compression on a hard blow<br> so the dip (after touch) is more even between pp and ff.<br><br>The straight-sided Crescendo punchings do not have the same tonal focus<br>effect but are an improvement over the standard woven punchings.<br><br>At the KC Convention I tested these with a few people at hand. The<br> straight-sided punchings improved the tone over the woven punchings<br>and the conical-sided punchings were a tonal improvement over the<br>straight-sided ones. The conical-shape or tapered sides do make a difference.<br> <br>If you turn it upside down the effect is negated. I've displayed this to customer's amazement.<br><br>Recently, I received a fairly new studio upright in my shop. I noticed that there<br>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<br> inverted. I placed all the punchings with the narrow side up, problem solved.<br><br>They are too firm for some pianos causing noticeable impact sound.<br>On those pianos the pear green punchings work well.<br><br>As for the 3/4" punchings, they do not offer as much support and can allow<br> the key to rock side to side more easily than the wider ones. I would use these<br>on a spinet or something else of no consequence.<br>-- <br><br>Regards,<br><br>Jon Page<br><br></blockquote><br></div></div></blockquote></div> <br>