<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> A hearty amen. When going through engineering school we primarily used metrics and even when I worked in design in industry. It sure did make the calculations easier. <o:p></o:p> <o:p> </o:p> Here’s a rough chart for you:<o:p></o:p> <o:p> </o:p> 1” = 25 mm (25.4)<o:p></o:p> 3/4 = 19 (19.1)<o:p></o:p> 1/2 = 13 (12.7)<o:p></o:p> 1/4 = 6 (6.35)<o:p></o:p> 1/8 = 3 (3.175)<o:p></o:p> 1/16 = about 1.5 (1.6)<o:p></o:p> 1/32 = about 1 (.8)<o:p></o:p> <o:p> </o:p> <div> Dean<o:p></o:p> <u1:PERSONNAME u2:st="on">Dean May</u1:PERSONNAME>             cell 812.239.3359 <o:p></o:p> PianoRebuilders.com   812.235.5272 <o:p></o:p> <u1:PLACE u2:st="on"><u1:CITY u2:st="on"><st1:place w:st="on"><st1:City w:st="on"><u3:place u4:st="on"><u3:City u4:st="on">Terre Haute</st1:City></u3:place></u1:CITY></u3:City> <u1:STATE u2:st="on"><st1:State u5:st="on"><st1:State w:st="on">IN</st1:State></u1:STATE></st1:State>  <u1:POSTALCODE u2:st="on"><st1:PostalCode u6:st="on"><st1:PostalCode w:st="on">47802</st1:PostalCode></u1:POSTALCODE></st1:PostalCode></st1:place></u1:PLACE><o:p></o:p> </div> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Jurgen Goering Sent: Monday, February 04, 2008 11:53 PM To: pianotech@ptg.org Subject: Re: Regulating Without Specs<o:p></o:p> </div> <o:p> </o:p> At the risk of opening a large can of worms and an even larger debate, I think this is perfect example of why going metric (like Dale Erwin demonstrated) is such an elegant mode of transport through exercises such as these. Mixing fractions with decimal inches may work in this prepped example, but the numbers are hardly ever so fortuitous. I heartily suggest to all technicians to immerse themselves in millimeters, stop converting to inches, buy metric rulers, calipers and whatever other measuring tools they need and discover the brilliant ease of working in that system. ducking for cover... Jurgen Goering <?/smaller>On Feb 4, 2008, at 19:20, pianotech-request@ptg.org wrote:<o:p></o:p> snip... Let’s just say you want something typical like a 3/8” key dip, 1/8” letoff, and .050” aftertouch.  (Later I’ll show the equations for solving for different variables)   Given the 3/8” key dip (.375”) and the .050” aftertouch, we subtract aftertouch from key dip and know then that we have .325” of useable key dip to move the hammer.  How far will it move?  It will move 5xs the amount of keydip.  5 x .325” = 1.625”.  But that’s not the hammer blow distance, because we haven’t accounted for letoff.  If we want 1/8” (.125”) letoff, we need to ADD that to the hammer travel of 1.625”, so the blow distance is then 1.75”, or 1 ž”.  ...snip... <?fontfamily><?param Arial><?smaller><?x-tad-smaller>OK, Lemme know whatcha think!<o:p></o:p> <?/x-tad-smaller><?/smaller><?/fontfamily> <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>   <?fontfamily><?param Arial><?smaller><?x-tad-smaller>John Dorr, RPT <o:p></o:p> <?/x-tad-smaller><?/smaller><?/fontfamily></blockquote> </div> </body> </html>