Do any manufacturers sand/file the bridge pins level? David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "David Love" <davidlovepianos at comcast.net> To: pianotech at ptg.org Received: 1/20/2010 7:39:02 PM Subject: Re: [pianotech] Renotching-Repinning-Reusing Bridges in rebuild >Not meant as a criticism, just a comment. I'm usually exchanging #6 pins >for # 7 at least in the capo section on many pianos so it requires a drill >out anyway. Similarly, most bridges extend #7 pins down through the tenor >and I often go up one size to #8s with predrilling to insure a tight fit. >Also, drilling out insures I don't have to grind down the tops of the pins. >Maybe it doesn't heat them up or stress them but there is a difference >between string pressure and file or belt sander pressure, namely that the >string applies pressure nearer the cap. The file or belt sander applies >pressure at the very top of the pin which can be quite a ways from the cap. >Some flagpolling can take place which can stress the fit at the cap. In >general, I don't file or sand the tops of the pins for that reason. > >David Love >www.davidlovepianos.com > >From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf >Of William Monroe >Sent: Wednesday, January 20, 2010 7:11 PM >To: pianotech at ptg.org >Subject: Re: [pianotech] Renotching-Repinning-Reusing Bridges in rebuild > >Sure, each their own. For the most part I guess it feels like trading one >task for another. Epoxy size the hole and drill out, or dip the pin and >drive in? Probably a wash for me. Yes, you really do need to wear gloves >when driving in the pins and shoe-shining the cap, but it's really a very >localized process for me. >As for stressing the pins, unless you really bear down on the pins, or sit >in one place, there is no danger of lateral stress or overheating. >Certainly nothing approaching what the strings themselves do, I would think. >I've heard the arguments, and I think it's a reasonable concern, but as with >most things in this biz, if you use appropriate care with this process, >there is no cause for concern. >I certainly don't think my was is the only way, or the "better" way, just >one that works for me. >William R. Monroe > >On Wed, Jan 20, 2010 at 6:02 PM, David Love <davidlovepianos at comcast.net> >wrote: >I used to do the epoxy in the pins thing but decided there wasn't much >reason for having to deal with the mess. By sizing the holes even slightly >with epoxy and reinforcing the wood you can run a drill quickly down through >to insure uniform depth and diameter and a clean surface. After that, >inserting the pins and just securing with a drop of thin CA is plenty to >secure them. I don't particularly like to file or belt sand the pins as I >think there's no need to either heat them up or put lateral stress on what >should be a tight fit. > >David Love > >
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