<html><div style='background-color:'><DIV> <P>Hi everyone, I'm a bit new to this thing so forgive me any errors in protocol. I am attempting to compile a comprehensive body of information on vertical actions and rebuilding. What I am looking for right now is any info on objectively determining the bore distance for upright hammers something along the lines of subtracting one measurement from another similar to what we do in grands by subtracting the height of the hammer flange center from string height. So if anyone out there has details on that sort of thing or any other vertical action geometry stuff I'd appreciate the input. Michael<BR><BR></P></DIV> <DIV></DIV> <DIV></DIV>>From: "Delwin D Fandrich" <PIANOBUILDERS@OLYNET.COM> <DIV></DIV>>Reply-To: Pianotech <PIANOTECH@PTG.ORG> <DIV></DIV>>To: "Pianotech" <PIANOTECH@PTG.ORG> <DIV></DIV>>Subject: Re: Thin Epoxy <DIV></DIV>>Date: Wed, 26 Feb 2003 22:49:58 -0800 <DIV></DIV>> <DIV></DIV>> <DIV></DIV>>----- Original Message ----- <DIV></DIV>>From: "Farrell" <MFARREL2@TAMPABAY.RR.COM> <DIV></DIV>>To: <PIANOTECH@PTG.ORG> <DIV></DIV>>Sent: February 26, 2003 7:54 PM <DIV></DIV>>Subject: Thin Epoxy <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> > I ran across this site and thought of Del and Ron N. and Ron O. They are <DIV></DIV>>out by Del. The topic of low viscosity epoxies has come up on the list <DIV></DIV>>often. <DIV></DIV>> > <DIV></DIV>> > http://www.rotdoctor.com/products/product.html <DIV></DIV>> > <DIV></DIV>> > A couple very interesting products: <DIV></DIV>> > <DIV></DIV>> > - CPEST (Clear Penetrating Epoxy Sealer) <DIV></DIV>> > - Tropical Hardwood Epoxy AdhesiveT <DIV></DIV>> > <DIV></DIV>> > The sealer is said to be of diesel fuel viscosity and penetrates into wood <DIV></DIV>>way more than other epoxies (laminating bridge caps - your soundboard <DIV></DIV>>coating thing). They also claim that WestSystem is petroleum based and cures <DIV></DIV>>brittle (I certainly agree that it is brittle).They say their epoxy is wood <DIV></DIV>>based and cures flexible. I'm not sure exactly how that might benefit/effect <DIV></DIV>>our work on pianos, but there it is (in a bridge cap, I don't see where it <DIV></DIV>>would make much difference - brittle or flexible). The penetrating sealer <DIV></DIV>>really gets my interest. Hmmm. Maybe we can laminate a thin strip of Kevlar <DIV></DIV>>into those bridge caps and use this penetrating sealer for the ultimate <DIV></DIV>>bridge cap - 'course it might be a bit of work to get a pin in it and to <DIV></DIV>>notch it. <DIV></DIV>>------------------------------------------------------ <DIV></DIV>> <DIV></DIV>> <DIV></DIV>>I am aware of this product, but have not used it. I've been just a bit <DIV></DIV>>apprehensive, mostly because I consider the advertising and promotion, along <DIV></DIV>>with the so-called comparison tests, to be just a little bit misleading. <DIV></DIV>>Basically, CPEST is a solvent-thinned epoxy resin. The major difference <DIV></DIV>>between this and other standard structural epoxies is that CPEST is supplied <DIV></DIV>>pre-thinned. In these 'tests' only its penetrating capability, not its <DIV></DIV>>structural strength, is being compared, yet the other standard, <DIV></DIV>>multi-purpose coating and penetrating epoxies have not been thinned to <DIV></DIV>>anywhere close to the viscosity of CPEST. I suspect that if the other <DIV></DIV>>epoxies had been thinned out with their appropriate solvents to the same <DIV></DIV>>viscosity as CPEST they would have penetrated much better than is indicated <DIV></DIV>>in this test. They would also loose some of their structural strength, as <DIV></DIV>>does, I suspect, Dr Rot. But this characteristic is not tested. You may <DIV></DIV>>notice that CPEST is not really being marketed as a structural epoxy while <DIV></DIV>>the others are. In terms of flexibility, if structural epoxies such as WEST <DIV></DIV>>System or System Three structural epoxies significantly they cure to a <DIV></DIV>>somewhat more flexible state as well. <DIV></DIV>> <DIV></DIV>>So, what have we? I suspect that CPEST is a basic structural epoxy thinned <DIV></DIV>>with whatever thinners are appropriate for the resin/hardener system and <DIV></DIV>>sold as a thin, penetrating epoxy sealer that is "strong." Before becoming a <DIV></DIV>>believer I would like to read an independent analysis of the material. <DIV></DIV>> <DIV></DIV>>Besides, in the soundboard work I've been doing I don't want the kind of <DIV></DIV>>penetration being described by Dr Rot. These boards are not rotten, they are <DIV></DIV>>structurally and stiffness impaired. I want all of the structural strength <DIV></DIV>>and stiffness I can get. O.K., within reason. <DIV></DIV>> <DIV></DIV>>Del <DIV></DIV>> <DIV></DIV>>_______________________________________________ <DIV></DIV>>pianotech list info: https://www.moypiano.com/resources/#archives <DIV></DIV></div><br clear=all><hr>The new <a href="http://g.msn.com/8HMDENUS/2737">MSN 8:</a> smart spam protection and 2 months FREE* </html>