Having gone from German to Japanese on many occasions over the years with the method I described of drilling out the hole prior to inserting the new oversized pin I can tell you it doesn’t matter, measured or not. If you just pound in a new pin I wouldn’t count on staying German to avoid problems either for the reasons I already mentioned. Comparing the pins in my shop I find very little difference in the length of the threaded part between the two pins. The tapered unthreaded part at the tip is slightly wider and slightly longer on the Japanese pin but since it is still narrower than the full diameter of the threaded part of the pin I can’t see how it would make any difference. At least that’s how I feed it. The point being that I don’t think there is any real reason to avoid using a Japanese pin if you so desire even if the previous one was German. Whichever you use, however, I would recommend either a shorter pin if you don’t want to ream or drill out the hole and shelf or drill it out and use whatever you fancy without worry. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Sunday, November 29, 2009 8:15 PM To: pianotech at ptg.org Subject: Re: [pianotech] Oversized tuning pins Well, really. Measure them then, as I have. The tip of the Japanese pin is significantly longer and more conical than the German. Whether you think it matters or not depends on how you feed your thinking.:-) P In a message dated 11/29/2009 6:36:57 P.M. Central Standard Time, davidlovepianos at comcast.net writes: I think it has less to do with where the threading starts and more to do with whether the length of the pin puts the new diameter in contact with the “shelf” that forms where the compression of the old hole stops from the original pin. It’s a good reason to ream or drill out the hole with something that fits the new size pin in order to, if nothing else, punch out that shelf so it doesn’t come in contact with the new pin, or use a shorter pin. I don’t think it matters that much if you go from German to Japanese pins. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Sunday, November 29, 2009 3:35 PM To: pianotech at ptg.org Subject: Re: [pianotech] Oversized tuning pins David: This is particularly true if one makes the mistake of mixing Oriental pins with standard or German pins. The profile of the pin-end is quite different with threading starting at quite different places, so that friction at the bottom of the pin is dramatically increased. P In a message dated 11/29/2009 4:42:56 P.M. Central Standard Time, davidlovepianos at comcast.net writes: It can also happen if the new oversized pin bottoms out where the original pin stopped. That area below the original pin is still the diameter designed for the original pin so when the new oversized pin gets down there it's too tight and worse, it's too tight at the bottom of the pin. David Love www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Al Guecia/AlliedPianoCraft Sent: Sunday, November 29, 2009 8:31 AM To: pianotech at ptg.org Subject: Re: [pianotech] Oversized tuning pins Scott, Yes, that's one of the possible causes, but there are others. Removing the old pins and creating to much heat (burning the hole). New tuning pins to large. And I'm sure there are hacks out there that can screw it up in other ways. Al -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091129/51460915/attachment-0001.htm>
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