This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I've wondered about this myself. My Wissner's capo is very badly = grooved. I've shifted some of the strings slightly to eliminate their = "zinging," but the capo will obviously need reshaping. As far as I'm aware, different metals are hardened via different = methods. However, the fact remains that this usually involves heating = and cooling for various periods of time -- something that's hard to do = with something as large as a harp -- and difficult to do without = stressing the metal and risking a crack. I believe some ferrous alloys are hardened with magnetic fields, perhaps = with moderate heating. Perhaps this could be a useful alternative? I = have no idea how this is done, though. Alternatively, does anybody ever grind the original capo off and overlay = a hardened bar, fitted for height? It could be epoxied in place for a = tight mechanical contact. Of course this begs the question of what = happens when a capo is ground and filed and ground and filed and ground = and files -- until the downbearing is inadequate. Yes, I know the plate = can be lowered, the bridge can be built up, the aliquot plates can be = filed, etc., but does this ever present a problem, such that a = technician might decide to rebuild a capo? Peace, Sarah Fox=20 (Columbus, Ohio) ----- Original Message -----=20 From: Kevin E. Ramsey=20 To: Pianotech=20 Sent: Friday, January 24, 2003 8:27 PM Subject: Re: Capo Hardening, was: Tuning problems under capo bar Hello Ron. I there anything you can tell us about hardening the capo. = I've seen you write about that before. Is this something you do in your = shop? Do you do it to all pianos? Do you have a method of testing the = hardness of the capo? Am I asking questions that have already been = answered? Thanks.=20 Terry Farrell=20 Terry, I don't know about Ron, but I've thought about it, and I = don't see how you could harden the capo. I hope I'm wrong, but you hard, = or temper a metal by heating it until it glows for a certain amount of = time, and then you quench it in either oil or water. The plate is going = to act as a gigantic heat sink, not allowing the metal to get to the = proper temp, and you'd have trouble quenching it even if you did. When = you heat a metal and allow it to cool by itself, it's called annealing, = and it softens the metal. Others can tell me if I'm all wet, but that's = how I understand it.=20 Kevin E. Ramsey ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/a6/11/2c/d8/attachment.htm ---------------------- multipart/alternative attachment--
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