This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I'd like to know more about how to diagnose bridge pin problems. Ed, = this is the answer I tried to get on the Pianotech list with my question = about seating strings, because I heard so many different things in the = process... thanks! I've been graphing the starting pitch of pianos ever since I began = tuning for money, usually just sampling every A. It helps me = communicate to the customer what work needs to be done, and records = whether the piano is stable or not. Well, I've finally uncovered a problem by doing this! I've now tuned = the same C3 three times in this current concert series, and the second = and third time the piano's been within a few cents of where I left it, = except for a 10-cent dip between A5 and A6. Checking it out closely today, I could see no damage to the soundboard, = ribs, or bridge in that area (which I suspected because the problem = occurred over a range of notes). As I fine-tuned, I noticed that the = problem was discontinuous, though: not every string was off by that = much. Listening to just a single string, I heard false beats, and so = tried pushing down on the string just in front of the speaking-side pin. = Naturally, it went sharp! :-) I pushed backwards on the top of the = same bridge pin, and the note cleaned right up. The strings were going = flat because of loose bridge pins! So, what other tricks are there to diagnose bridge problems? I've heard = of using vice grips (handy when the problem is in the low tenor on a = "D"!). Which direction should you apply pressure on the pin? Aft? = Down? --Cy Shuster-- Bluefield, WV ----- Original Message -----=20 From: Ed Sutton=20 To: College and University Technicians=20 Sent: Sunday, April 17, 2005 5:05 PM Subject: Re: [CAUT] CA for loose pins on a "D"? To find out if it is a loose bridge pin, mute off carefully to a = single string and have someone play the note while you go to the tail of = the piano and press on the pin with a screwdriver tip. If the pin is = loose, it should stop beating when you press the pin. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/b9/21/33/a1/attachment.htm ---------------------- multipart/alternative attachment--
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