Until we have more info from Paul it's difficult to know what to suggest. The original is probably 16 mm and Paul has changed to 17mm on the knuckle. That will increase the dip specs but .415 is a fairly deep dip and would suggest an action ratio that is on the lower side already (assuming that measurement is accurate). So unless the hammers are really monsters (which they could be) then I would expect one to be able to achieve a reasonable FW even if it is with a moderately higher BW. A direct measurement of the action ratio (6 mm dip causes hammer travel of x?) would be helpful. As was mentioned by several contributors, friction readings need not be a mystery and can easily be ascertained by a survey of the UW and DW through the keyboard. Remaking the keys certainly would solve any questions and problems but it's not in the cards for this job. Still, having redone many of these actions without remaking keys there are always solutions. But without the data it's difficult to know the limits of what is achievable and the best way to get there. David Love www.davidlovepianos.com From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Brent Fischer Sent: Wednesday, August 25, 2010 6:58 AM To: caut at ptg.org Subject: Re: [CAUT] Down Weight Too High With New Hammers Hey guys, David, I know it is counter-productive to increase interia by moving leads to the front. We know Steinway fit the action to the strike line therefore moving the capstans away from the theoretically correct position. Hamburg fits the piano to the action which is why I've seen so many prefer it over NY. I am interested in your solution given Paul's constraints. I believe the original knuckle dimension is around 15.5 mm? I found this always increased dip when going longer however am not an action designer, but have had Roseland Piano re-manufacture several of this vintage keyboards with corrected ratios and it was the answer to being able to lead closer to the balance rail with great results. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100825/241c7a51/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC