Paul, You can have consistent spring tension and then float the front weight and the friction (some manufacturers attempt this, old Hamburg Steinways were a good exectuion). Or you can have consistent friction and front weight and slightly float the spring tension (the hallmark of a good Stanwood job). It depends on what you desire and can accomplish through design and execution. In the real world (well mine anyway) in this type of overhaul of existing parts, I control friction first, including scuffing friction by correcting geometry as necessary, then I calibrate the strike weight (even it out) and pattern lead the keys for general weight control and then I apply the assist springs to refine the touch weight. To adjust the springs use the small tab, you can bend the long arm at the coil some, but the more effective adjustment is the small arm. Do not put a kink in the long arm as is sometimes suggested to reduce the spring's affect. It will reduce the strength but that's the end of controlled adjustment after that. Just regulate the arms at the coil. You say it is weighing off on the light side. Is this due to low friction or low balance weight? If it's low friction don't cut off the springs. I must admit I don't understand what seems to be contradictory "It's weighing off all over the place" and "and the weigh off chart says ther're very close." Close to what? What chart? If you unhook the springs and weigh off what do you get? How much of the weight is from the spring application? It shouldn't be more than 12 grams at the most extreme. I probably have other questions. Chris Solliday ----- Original Message ----- From: Paul T Williams To: CAUTlist Sent: Monday, May 10, 2010 12:01 PM Subject: [CAUT] Turbo wips Hi All, I'm having a problem with an older set of Renner Turbo Wips. I have no idea how to get a consistant spring strength from note to note. It's weighing off all over the place, but it doesn't seem consistant with how the springs "feel". With the stack off and hammers out of the way, some wips rise way up with a neighboring wip hardly rising at all, but they "feel" different in springyness and the weigh off chart says they're very close. All else is in good regulation and pinning. On the whole, it's weighing off a bit lighter than the professor likes, and wondering if I should just get rid of the assisting springs? What say you? Thanks Paul -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100510/0b733e73/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC