<font color='navy' size='2' face='Comic Sans MS, sans-serif'>Yeah<font size="2" color="navy" face="Comic Sans MS, sans-serif"> Michael<br>  This piano-tech lite. Enjoy it while you can<br> <br> <div style="clear:both"><font size="1" color="royalblue"><b><font face="Georgia, Times New Roman, Times, Serif"><font color="black"><font color="mediumblue" face="Comic Sans MS, sans-serif">Dale Erwin... RPT</font><br> </font></font></b></font><font color="darkgreen"><span style="font-style: italic;"><b><font size="1"><font color="black"><font color="blueviolet"><font color="black"> <font color="black" face="Comic Sans MS, sans-serif">Mason & Hamlin</font><font face="Comic Sans MS, sans-serif">/Steinway/</font><font color="black" face="Comic Sans MS, sans-serif">U.S pianos</font><font face="Comic Sans MS, sans-serif"><br> </font></font></font></font><font color="black" face="Comic Sans MS, sans-serif">www.Erwinspiano.com</font><br> <font color="crimson" face="Comic Sans MS, sans-serif">209-577-8397</font><br> <font color="darkgreen"></font></font></b></span></font><tt><tt><font color="darkgreen"><br>  </font><br>   <font size="2"></font></tt></tt><br> <br> </div> <br> <br> <div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br> From: Michael Spreeman <m_spreeman@hotmail.com><br> To: pianotech <pianotech@ptg.org><br> Sent: Mon, Apr 30, 2012 9:35 am<br> Subject: [pianotech] FW: [PTG Pianotech]: RE:plate stress- Finite element model<br> <br> <div id="AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d"> <style>#AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d td{color: black;} #AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d .hmmessage P { margin:0px; padding:0px } #AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d body.hmmessage { font-size: 10pt; font-family:Tahoma } </style> <div dir="ltr"> <br> <div><br> <style>#AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d td{color: black;} #AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d .ExternalClass .ecxhmmessage P {padding:0px;} #AOLMsgPart_1_bdf04e28-2f2c-4008-9980-26b4befae45d .ExternalClass body.ecxhmmessage {font-size:10pt;font-family:Tahoma;} </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><a href="http://www.strand7.com/html/pianopaper.htm" target="_blank">www.strand7.com/html/pianopaper.htm</a></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 color="#330000" face="Geneva, Arial, Sans-serif"><br> </font></font></em></div> <div><em><font color="#330033"><font color="#330000" face="Geneva, Arial, Sans-serif"><br> </font></font></em></div> <div><em><font color="#330033"><font color="#330000" face="Geneva, Arial, Sans-serif">Michael Spreeman </font></font></em> <div> <div><font color="#000066"><a target="_blank" href="http://www.spreemanpianoinnovations.com">w</a>ww.RavenscroftPianos.com</font></div> <br> <br> <div> <div id="ecxSkyDrivePlaceholder"></div> <hr id="ecxstopSpelling">From: <a href="mailto:noreply@egroups.ptg.org">noreply@egroups.ptg.org</a><br> To: <a href="mailto:m_spreeman@hotmail.com">m_spreeman@hotmail.com</a><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 target="_blank" href="http://my.ptg.org/PTG"> <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 align="center" width="100%" border="0" cellpadding="0" cellspacing="0"> <tbody><tr> <td valign="top"> <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tbody><tr id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_RTBreadCrumb" style="background-color:#391213;padding:5px;border:1px solid #193b7b;height:30px;width:100%;border:0"> <td style="border:0;padding-left:15px" valign="middle" width="70%"> <a target="_blank" href="http://my.ptg.org/" style="color:#fff">PTG</a> | <a target="_blank" href="http://my.ptg.org/PTG/Communities/" style="color:#fff">Communities</a> | <a target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/?MID=0&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" style="color:#fff">View Discussions</a> | <a target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/DigestViewer/?GroupId=43&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" style="color:#fff">Pianotech</a> </td> <td style="border:0;padding-right:10px" align="right" valign="middle" width="30%"> <a target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/FeedBack/?GroupId=43&MID=0&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662" style="color:#fff"> FEEDBACK | QUESTIONS </a> </td> </tr> <tr> <td colspan="2"> <a name="bm0"></a> <table class="ecxMailContainer" width="100%" border="0" cellpadding="0" cellspacing="0"> <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"> <br> </td> <td class="ecxLeftPane"> <a target="_blank" href="#bm-1" style="color:#f7c75a;text-align:center"> </a>  <a target="_blank" href="#bm1" style="color:#f7c75a;text-align:center"> </a> </td> <td style="width:5px" class="ecxLeftPane"> <br> </td> </tr> <tr class="ecxListBody" style="vertical-align:top"> <td style="background-color:white;width:100%"> <table class="ecxMailMessageContainer" width="100%" border="0" cellpadding="0" cellspacing="0"> <tbody><tr> <td style="padding-left:30px" valign="top" width="98%"> <table style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif" border="0" cellpadding="4" cellspacing="0"> <tbody><tr> <td style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right" valign="top"> From: </td> <td class="ecxMailMessageLinks"> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_FromLink_0" target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/MyBioView/?ContactKey=93a77deb-ce2f-48f6-a559-d76bb70545dd&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662">Gregory Graham</a> </td> </tr> <tr> <td style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right" valign="top"> To: </td> <td class="ecxMailMessageLinks"> <a id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ToLink_0" target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/DigestViewer/?GroupId=43&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662">Pianotech</a> </td> </tr> <tr> <td style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right" valign="top"> Posted: </td> <td class="ecxMailMessageLbl"> <span id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_lblRecieved_0">April 29, 2012 9:39 PM</span> </td> </tr> <tr> <td style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right" valign="top"> 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 style="font-weight:bold;padding-right:1em;font-weight:bold;width:100px" align="right" valign="top"> Message: </td> <td> <br> </td> </tr> </tbody></table> </td> <td style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif;padding:6px 6px00000d00000a 6px 6px" align="center" valign="top" 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" target="_blank" href="http://my.ptg.org/PTG/Communities/ViewDiscussions/MyBioView/?ContactKey=93a77deb-ce2f-48f6-a559-d76bb70545dd&MDATE=947%3e47567&UserKey=e782be76-892b-4d89-8e81-db0e2a34e662"><img id="ecxActiveCopy_CHTMLRealTimeMail1_DigestMessageList1_DigestMessageList_ProfileImageDisplay_0_imgProfile_0_ImageDisplay_0" title="Gregory Graham" 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<div style="clear:both"> </div> </div> </div> </div> </div> </td> </tr> <tr> <td colspan="2" style="font-size:9pt;font-family:Frutiger, Arial, Helvetica, sans-serif;padding-left:30px" valign="top" width="100%"> <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 style="width:200px;background-color:#efefef;text-align:left" width="5"> <br> </td> <td style="width:200px;background-color:#efefef;text-align:left;vertical-align:top" width="170"> <table width="180" border="0" cellpadding="2" cellspacing="3"> <tbody><tr> 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