<html> <head> <style></style></head> <body class='hmmessage'><div dir='ltr'> <br><div><br> <style></style> <div dir="ltr"> Wayne Stuart thought the weight of his iron frame was excessive.  To quote:  "<span class="ecxApple-style-span" style="font-size:12px;line-height:16px;font-family:Arial">The detailed finite element model of the existing Stuart and Sons piano frame was built and solved using Strand7. The complex geometry of the piano's cast iron frame was modelled using over 5000 "thin shell" plate elements. The various colours of these elements in the model designate sections of different thickness."  Here's the link which also has the color coded image:   </span>www.strand7.com/html/pianopaper.htm</div><div dir="ltr"><br></div><div dir="ltr">The new and improved "Stuart Lite" ?<br><div><br></div><div>Greg, please let me know if you receive this as I was unable to log in to "my ptg".  I thought perhaps I had forgotten my password, but found out I had not, at least according to  the email confirmation .  I then tried a few different avenues to log in to no avail, so I'm giving up in frustration and posting this here. <br><div><em><font color="#330033"><font face="Geneva, Arial, Sans-serif" color="#330000"><br></font></font></em></div><div><em><font color="#330033"><font face="Geneva, Arial, Sans-serif" color="#330000"><br></font></font></em></div><div><em><font color="#330033"><font face="Geneva, Arial, Sans-serif" color="#330000">Michael Spreeman </font></font></em><div><div><font color="#000066"><a href="http://www.spreemanpianoinnovations.com" target="_blank">w</a>ww.RavenscroftPianos.com</font></div><br><br><div><div id="ecxSkyDrivePlaceholder"></div><hr id="ecxstopSpelling">From: noreply@egroups.ptg.org<br>To: m_spreeman@hotmail.com<br>Subject: [PTG Pianotech]: RE:plate stress<br>Date: Sun, 29 Apr 2012 21:39:21 -0400<br><br> <span class="ecxMailWarningMsg"></span><div style="clear:both"></div> <div id="ecxLogo"> <a href="http://my.ptg.org/PTG" target="_blank"> <img src="http://higherlogicdownload.s3.amazonaws.com/PTG/176170ca-bf4c-4622-927b-bcd9bad0447e/UploadedImages/PTG%20Logo%20Master.png" alt="Piano Technicians Guild"></a> </div> <div> <div class="ecxContentUserControl"> <table border="0" cellpadding="0" cellspacing="0" align="center" width="100%"> <tbody><tr> <td valign="top"> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tbody><tr id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_RTBreadCrumb" 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target="_blank"> FEEDBACK | QUESTIONS </a> </td> </tr> <tr> <td colspan="2"> <a name="bm0" target="_blank"></a> <table class="ecxMailContainer" cellpadding="0" cellspacing="0" border="0" width="100%"> <tbody><tr style="padding-right:5px;padding-left:5px;padding-bottom:5px;color:white;padding-top:5px;background-color:#6A3F21;font-weight:bold" align="center"> <td style="width:100%;color:#ffffff;text-align:left" width="86%"> <span id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_MessageTitleLabel_0">RE:plate stress</span> </td> <td style="width:5px" class="ecxLeftPane"> </td> <td class="ecxLeftPane"> <a href="#bm-1" style="color:#f7c75a;text-align:center"> </a>  <a href="#bm1" style="color:#f7c75a;text-align:center"> </a> </td> <td style="width:5px" class="ecxLeftPane"> </td> </tr> <tr class="ecxListBody" style="vertical-align:top"> <td style="background-color:white;width:100%"> <table cellpadding="0" cellspacing="0" border="0" class="ecxMailMessageContainer" width="100%"> <tbody><tr> <td width="98%" style="padding-left:30px" valign="top"> <table cellpadding="4" cellspacing="0" border="0" style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif"> <tbody><tr> <td valign="top" style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right"> From: </td> <td class="ecxMailMessageLinks"> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_FromLink_0" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/MyBioView/?ContactKey=93a77deb-ce2f-48f6-a559-d76bb70545dd&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" target="_blank">Gregory Graham</a> </td> </tr> <tr> <td valign="top" style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right"> To: </td> <td class="ecxMailMessageLinks"> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ToLink_0" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/DigestViewer/?GroupId=43&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" target="_blank">Pianotech</a> </td> </tr> <tr> <td valign="top" style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right"> Posted: </td> <td class="ecxMailMessageLbl"> <span id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_lblRecieved_0">April 29, 2012 9:39 PM</span> </td> </tr> <tr> <td valign="top" style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right"> Subject: </td> <td class="ecxMailMessageLbl"> <span id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_lblSubject1_0" title="RE:plate stress">RE:plate stress</span> </td> </tr> <tr> <td valign="top" style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right"> Message: </td> <td> </td> </tr> </tbody></table> </td> <td style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif;padding:6px 6px\00000d\00000a 6px 6px" valign="top" align="center" width="2%"> <div id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_pnlDirectoryImage_0" class="ecxMailProfileImagePanel"> <div class="ecx"> <div class="ecxContent"> <div id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_pnlProfileImage_0"> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_imgProfile_0_ImageLink_0" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/MyBioView/?ContactKey=93a77deb-ce2f-48f6-a559-d76bb70545dd&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" target="_blank"><img id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_imgProfile_0_ImageDisplay_0" title="Gregory Graham" height="75" width="62" src="http://my.ptg.org/HigherLogic/Directory/ImageDisplay.aspx?Key=9d6aa3f1-6eb7-4253-9bc9-258dd161373a&dt=368325042179&h=75&w=75" alt="" align="middle"></a> <div id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_imgProfile_0_pnlDHelpStep1_0" class="ecxInfoContainer"> </div> </div> <div> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_lnkViewProfile_0" title="View the profile of author" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/MyBioView/?ContactKey=93a77deb-ce2f-48f6-a559-d76bb70545dd&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" target="_blank">View Profile</a> <div style="clear:both"> </div> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_lnkAddContact_0" title="Add author as contact" 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target="_blank">Contact Author</a> <div style="clear:both"> </div> </div> </div> </div> </div> </td> </tr> <tr> <td width="100%" colspan="2" style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif;padding-left:30px" valign="top"> <span id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_lblMessage_0"> It depends on what part of the plate you are looking at.  Some compression, some bending, some torque, some tension, some shear.  Sometimes all in the same place.<br><br> In general, plate stress is equal and opposite the tension of the strings.  The plate struts are mostly under compression, but since they are above the string plane, they are also resisting bowing like an archery bow.  <br><br> Are you looking for the basics, or a more specific discussion?  I'd like to see a digital finite element analysis of plate stress myself, if any of the manufacturers would care to share.  No specific numbers required: just a color coded image showing the stress "hot spots" would be educational.  <br><br> What I've always wondered is why there isn't an iron frame on both sides of the belly for balance.  <br><br> -------------------------------------------<br> Greg Graham, RPT (and former Mechanical Engineer)<br> Brodheadsville, PA<br> -------------------------------------------<br><br> -------------------------------------------<br> Original Message:<br> Sent: 04-28-2012 07:23<br> From: Mark Ritchie<br> Subject: plate stress<br><br><br> When string tension is applied to the piano in what direction is the stress on the plate?<br><br> -------------------------------------------<br> M.Ritchie<br> -------------------------------------------<br><br><br><br><br></span> </td> </tr> </tbody></table> </td> <td width="5" style="width:200px;background-color:#efefef;text-align:left"> </td> <td style="width:200px;background-color:#efefef;text-align:left;vertical-align:top" width="170"> <table cellpadding="2" cellspacing="3" border="0" width="180"> 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