BTW make sure that the damper up stop rail isn’t impeding the key from moving freely through the entire key stroke. David Love www.davidlovepianos.com From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of David Love Sent: Thursday, May 27, 2010 1:30 PM To: caut at ptg.org Subject: Re: [CAUT] Bore distances for Steinway L First thing is you need to get your units consistent and correct. You said the bore on the bass hammer was 2 1/8”, the string height you post below at 19.7 mm at A0 (I think you must mean 19.7 cm) and the center pin height is 5 ¾”. So converting everything to a single unit measure you have the CP height at 146 mm, the string height at A0 at 197 mm and the bore distance of the bass hammers at 54 mm (rounded off). The bore distance is slightly long, in fact, if your measurements are correct (you only needed 51 mm) so I’d double check them. Assuming that there isn’t some regulation anomaly that is preventing the hammer from rising all the way to the string it suggests some serious problem with convergence such that you have too much sliding and not enough lifting. I would double check your measurements. 10 mm dip is a fine target and, in fact, it is not likely that the original set up had more than that, probably less. The .5 mm difference between what you have and Keith’s suggestion of .410” or about 10.4 mm is not going to account for the 6.35 mm shortage (1/4” that you mentioned earlier). David Love www.davidlovepianos.com From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Paul T Williams Sent: Thursday, May 27, 2010 8:35 AM To: caut at ptg.org Subject: Re: [CAUT] Bore distances for Steinway L 5-3/4" From: "David Love" <davidlovepianos at comcast.net> To: <caut at ptg.org> Date: 05/27/2010 10:31 AM Subject: Re: [CAUT] Bore distances for Steinway L _____ What’s the key bed to center pin height? You need that too. David Love www.davidlovepianos.com From: caut-bounces at ptg.org [ <mailto:caut-bounces at ptg.org> mailto:caut-bounces at ptg.org] On Behalf Of Paul T Williams Sent: Thursday, May 27, 2010 8:22 AM To: caut at ptg.org Subject: Re: [CAUT] Bore distances for Steinway L The buttons are original and plenty of room both up and down compared to the rail. I'm pretty sure I matched the new flanges/shanks to the old ones (too late to check that now, but I almost always do) The key dip is 10mm. The string heights are as follows A-0 19.7 A#-2 19.7mm B-2 19.1 D-5 19.3 D#-5 19 G-6 18.8 G#-6 18.8 C8 18.8 Paul From: "David Love" <davidlovepianos at comcast.net> To: <caut at ptg.org> Date: 05/27/2010 10:05 AM Subject: Re: [CAUT] Bore distances for Steinway L _____ The proper bore distance is the one you determine by measuring the distance between the flange center pin height and the string height in each section. Check that first. Are you unable to get the let off closer because the let off buttons are bottoming out against the rail? If so then maybe you have the wrong buttons on there. Did you change the shanks and flanges to a new dimension? If so, did you change the dip to accommodate that? What is the current key dip? David Love www.davidlovepianos.com From: caut-bounces at ptg.org [ <mailto:caut-bounces at ptg.org> mailto:caut-bounces at ptg.org] On Behalf Of Paul T Williams Sent: Thursday, May 27, 2010 7:55 AM To: CAUTlist Subject: [CAUT] Bore distances for Steinway L Hi all, It's been years since I bored my own hammers and need a number. What is a proper bore distance for a Steinway L (1924). I installed some Abel Naturals last fall and the project went on hold while the piano got a new board and bridges. I just measured A-0 and it's 2-1/8". I'm trying to regulated the action and am having a tough time for some reason. The key level and dip is factory perfect, I've got the proper blow distance of 1.75". I can't get let off any closer than 1/4"!! The rebuild was done right and the plate is the same height as before. I've even tried to raise the blow a bit, and still can't get it to let off correctly. The frame is perfectly bedded. The wips are old, but in pretty good shape. I started at A-0 and only tried 5-6 notes before writing yall. I'm wondering what's going on. Any thoughts of what to check next? Paul -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100527/37c875da/attachment.htm>
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