You need a completely level bench to regulate on in your shop for starters. I use a large Steelcase desk top leveled on top of cabinets with drawers for my supplies. I also use a "Grand Let Off Rack" available from Schaff Piano Supply. I regulate let off, key height and hammer line on all end keys prior to removal of the action. This way I have my proper let off and (usually) proper after touch prior to removing the action. The let off now becomes my hammer line when using the Let Off Rack. I lower the rack to the exact same height I had preset for the LET OFF --------- NOT the hammer string line. That way, I will have a consistent let off when I regulate it to just "whisp" the rack. I use it to also set my hammer line in the same manner as well as regulation of the back check, drop etc. That 1/16" difference in back check because of the lowered hammer line to match let off on the rack will not matter once the action is placed back into the piano. It comes out consistently for me every single time. From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of jim ialeggio Sent: Wednesday, July 29, 2009 9:57 AM To: pianotech at ptg.org Subject: [pianotech] regulating backchecks? My Dear Action Nerds, As I work to refine my grand regulation skills and procedures, I've run into a catch 22 regarding grand backcheck regulation which has me scratching my head. Here's the problem: In order to accurately regulate the backcheck, you need to be able produce the full dip that will occur when the action is bedded in the action cavity. However, in order to actually adjust the backcheck, especially if the adjustment is an angle adjustment the action needs to be pulled from its bedded condition so yo can get at the backchecks to do the adjustment. Now, as the action is no longer bedded, you have thus lost ability to reproduce the bedded dip and full excusion of the key/backcheck, and you no longer know what adjustment you need to make. Similarly, I can regulate a very nice consistent backcheck line on the bench, with bedding approximately reproduced, but not quite...then the action goes into the piano and bingo I wasted my time. What am I missing here? Jim I -- grandpianosolutions.com (under construction) Shirley, MA (978) 425-9026 _____ avast! Antivirus <http://www.avast.com> : Outbound message clean. Virus Database (VPS): 090728-0, 07/28/2009 Tested on: 7/29/2009 2:31:08 PM avast! - copyright (c) 1988-2009 ALWIL Software. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090729/9f7abfc8/attachment.htm>
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