This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Wim, I remember you asked about the rep, springs, if you lightly massage the spring after tensioning them, you stabilize them, so they stay with the same strongness. You massage lightly the underside of the spring, that helps too to fine tune its response. That how it is done. The springs don't need to be too strong, but they may respond well, the shape of their curve play a role in that. To have a spring stronger, you can bend it, but if you pull straight on the extremity of the string with your hook you will stiffen the coils more durably (and faster) . The hook part of the spring tend to deform while doing it, so I turn my tool so the spring disengage from the tool before its too much deformed. You will see that on some pianos someone have done that yet in the factory, and the hooked extremity of the spring is yet opened. I was shown recently how to un bend the springs if someone put a kink in it, that is why the "S" shape of the Yamaha spring tool is so efficient, you can straighten a kink with it (not with the Hart tool)/ Best. Regards. Isaac OLEG -----Message d'origine----- De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de Isaac OLEG Envoye : mercredi 16 octobre 2002 15:12 A : College and University Technicians Objet : RE: bobble heads Hello, Possibly because of the new knuckle position the jack is not clearing it or is locked in the little cushion in the lever window. Bad action stack may be , check by lifting one side of the keyboard and see if the action warps a lot or if the drop screws are not aligned. Warped action stack and bad frame bedding could well add to the thing Hammer tail too short, backchecks angle , and so on .... too much dip Isaac OLEG -----Message d'origine----- De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de Wimblees@aol.com Envoye : mercredi 16 octobre 2002 00:47 A : Pianotech@PTG.org; caut@ptg.org Objet : bobble heads Problem: Bobbling hammers on a S&S M from C5 on down. I mean, they don't even check on a hard blow. Some of them are checking, but only on a hard blow. The rest just bobble. New hammers, shanks and flanges. Let off is right, drop is right, there is after touch. I changed let off, I changed drop. Keys are level, right amount of dip. I increased dip, decreased dip. I've increased rep spring, and decreased rep spring. Dampers are not in the way. Nothing. This is a 1939 model. There has been some discussion about knuckle size. As I said, these are relatively, (about 3 years old) new h/s/f/ , with 3/8" knuckles. Could that have an effect? Wim ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/b1/15/cb/da/attachment.htm ---------------------- multipart/alternative attachment--
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