That was a satisfying meal. Thank you. Barbara Nobbe, RPT Pitch Perfect 859-489-4793 barbara at pitchperfectpianos.com -----Original Message----- From: "David Ilvedson" <ilvey at sbcglobal.net> Date: Thu, 4 Mar 2010 12:48:52 To: <pianotech at ptg.org> Subject: Re: [pianotech] Center Pin Zapper Well, that would have to be Joe... '-] David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "Paul McCloud" <pmc033 at earthlink.net> To: pianotech at ptg.org Received: 3/4/2010 12:33:25 PM Subject: Re: [pianotech] Center Pin Zapper >Unless you remove the pin from the flange, no matter what type of heat you use >(soldering iron or zapper) the pin is conducting heat to the birds-eye. Now if you >remove the pin and disassemble the flange, reinsert a pin and heat it, then it's a >whole different ball game. Ironing down the fibers is going to be a good thing if not >overdone and scorching the cloth. There has to be some temperature limiting >system. Sizing the felt with a shrink solution, with a pin inserted, works well to >compact the felt in the bushing. It seems to me, though, that doing that makes it >likely that a big increase in humidity is going to re-swell the bushing again. Back to >square one. >I'd like to hear from some old-timers about this process of shrinking/sizing the >bushings, and the longevity of it. It seems that on pianos made overseas (China >especially) that bushings seem more prone to seizing because of the climate change. > Paul McCloud > San Diego >-----Original Message----- >From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf >Of Poppy Miles >Sent: Thursday, March 04, 2010 10:05 AM >To: David Ilvedson; pianotech at ptg.org >Subject: Re: [pianotech] Center Pin Zapper >Although I'm still entertaining the idea of making a zapper ( I saw one that seemed >to work without burning the birdseye or the bushing cloth). This zapper is pretty >elaborate, and manages to deliver a very small charge through the pin, and has a >beeper that goes off when you locate the sides of the pin with sharpened tongs >made of spring steel ( the charge is deadened with a block of wood where you grab >it.)The main thing that has discouraged me from making a copy of the one I had >used, is I don't like the idea of heating up the birdseye. I've heard they can be >worse than a waste of time. I would have to make, and study the effects of this tool >on a scrap part beforefeeling confident it would be safe and reliable. A few of you >said they are not. Without a sort of experiment where the humidity is controlledor >measured alongside a reamed part, I can't be sure. Reaming workswell, but all >pinning changes with humidity. Also, after reaming > thebushing cloth is fuzzed up, so the action center needs to be worked in order to >smooth it. You also have to be very careful to ream evenly, and there is a chance of >pushing out a bushing. Sometimes, after repinning the part becomes looser, because >the part wasn't worked enough.I've seen alcohol/ water treated bushings regain a >little of their tightness, but I'm not sure if that was due to a change inthe humidity or >not. It's also easier to get a small change with reaming, than with a solution. You >also have to wait for it to dry. I've saw a demonstration at convention where the >lecturer used the old trick of heating up the centerpin with a lighterto loosen it. I >tried this and wished I hadn't, ( the bushing looked a little charred). I'm sure there >are people who this technique works well for, but I will pass. I do actually reason >forgiving youall this well known info: all methods seem to have drawbacks. So why >not try a new one? My key > bushing iron works well, so maybe using heat instead of electricity, reaming, or >solutions could work. Maybe there's not enough pressure on the bushing with a >zapper, and the problem of heating the birdseye could be eliminated ( by separating >the parts.) If anyone feels like designing a heated centerpin caul type tool ( modified >soldering iron attachment), avariation on the lighter method where the amt of heat >would be controlled more carefully,I think it might work. That said, I will continue >using my reamers, after all, I am patient as is anyone who has read this incredibly >long post. >----- Original Message ---- >From: David Ilvedson <ilvey at sbcglobal.net> >To: pianotech at ptg.org >Sent: Wed, March 3, 2010 5:49:44 PM >Subject: Re: [pianotech] Center Pin Zapper >Yes...zapper is a waste of time >David Ilvedson, RPT >Pacifica, CA 94044 >----- Original message ---------------------------------------- >From: "Gregor _" <karlkaputt at hotmail.com> >To: pianotech at ptg.org >Received: 3/3/2010 1:26:13 AM >Subject: Re: [pianotech] Center Pin Zapper >>I never heard of that idea of a zapper and it sounds really weired to me. How long >>does it take, I mean how long do you zapp one center pin? Would it not be easier, >>quicker and more long lasting to replace that pin? >>Gregor >>------------------------------------------ >>piano technician - tuner - dealer >>Mnster, Germany >>www.weldert.de >>> Date: Tue, 2 Mar 2010 15:09:57 -0700 >>> From: mark.purney at mesapiano.com >>> To: pianotech at ptg.org >>> Subject: Re: [pianotech] Center Pin Zapper >>> >>> I've heard other claims that the results can sometimes be permanent, or >>> at least long-term. Maybe the ironing effect of the heat reconfigures >>> the bushing fibers in some cases, but not others? I'll experiment and >>> see what kind of results I get - it's not a complicated or expensive >>> device to build. Thanks for the information! >>> >>> >>> On 3/2/2010 1:57 PM, Michael Magness wrote: >>> > I have one I rarely use, it's results are temporary at best. The >>> > results of the device is/are heat, resulting in drying the flange >>> > bushing cloth thereby cauing it to stop sticking. The problem of >>> > course is that the humidity returns and with it the problem. >>> >> >>_________________________________________________________________ >>http://redirect.gimas.net/?n=M1003xHotmail2 >>Alles in einem Postfach Ich will Hotmail! > >No virus found in this incoming message. >Checked by AVG - www.avg.com >Version: 8.5.435 / Virus Database: 271.1.1/2707 - Release Date: 03/03/10 19:34:00
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