Conservatives... David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "Greg Newell" <gnewell at ameritech.net> To: "Pianotech List" <pianotech at ptg.org> Received: 3/10/2008 7:15:19 PM Subject: RE: Bass Bridge Position >Ok, something weird just happened. I started a question/response and it >disappeared or accidently sent or something suspicious like that. Anyway, my >questions was why the 5 notes on the trans bridge made life easier for the >tuner. In scaling I've understood that the primary factor is a smooth line >for tension. Are you, in this area, favoring a smooth progression of >inharmonicity rather than tension or impedance? >Greg Newell >Greg's Piano Forté >www.gregspianoforte.com >216-226-3791 (office) >216-470-8634 (mobile) >-----Original Message----- >From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf >Of Delwin D Fandrich >Sent: Monday, March 10, 2008 6:26 PM >To: 'Pianotech List' >Subject: RE: Bass Bridge Position >David, >My current Model O scaling calls for five notes on the transition bridge >(making >life easier for the tuner), 12 notes of wrapped mono-chords and 14 notes of >wrapped bi-chords. I have two scales in my records that are now my >standards. >One has an A-1 speaking length of 1325 mm, the other is 1300 mm. I prefer >the >latter if everything works out and the phase of the moon is just right. >And, yes, the extra backscale length is worth going after. >Del >Delwin D Fandrich >Piano Design & Manufacturing Consultant >620 South Tower Avenue >Centralia, Washington 98531 USA >Phone 360.736-7563 ><mailto:fandrich at pianobuilders.com> >| -----Original Message----- >| From: pianotech-bounces at ptg.org >| [mailto:pianotech-bounces at ptg.org] On Behalf Of David Love >| Sent: March 10, 2008 9:21 AM >| To: 'Pianotech List' >| Subject: RE: Bass Bridge Position >| >| I'll look at that again. At the moment I have the transition >| 27 - 32 with >| 32 at 850mm and 27 at 975 (F33 is 935). A#2 (note 26) is at >| 896 and A0 is 1320. As I mentioned, I could move the bass >| bridge a bit more forward and gain maybe 15 or 20 mm of >| backscale length. Putting the transition up to note 32 >| definitely gets the bottom of the tenor bridge away from the >| bottom of the bass bridge. >| >| The overall tension on this piano is about 37000lbs and I've >| tried to keep it down there as it's an older O without the >| cross strut between the tenor and bass long struts (on the >| plate). Not sure if that's a factor but plate failure is >| something I don't care to think about. I've smoothed it out >| but kept the plain wire tensions in the mid 150s drifting >| only slightly higher at the upper end. >| >| David Love >| davidlovepianos at comcast.net >| www.davidlovepianos.com >| >| -----Original Message----- >| From: pianotech-bounces at ptg.org >| [mailto:pianotech-bounces at ptg.org] On Behalf Of Ron Nossaman >| Sent: Sunday, March 09, 2008 8:37 PM >| To: Pianotech List >| Subject: Re: Bass Bridge Position >| >| >| > Looking at it again I could actually move it up fairly >| easily without >| > any plate grinding since there is a bit of room from where >| A0 crosses >| > and the end of the bridge. My scale experiments suggest that this >| > scale looks a >| bit >| > better with 12 or 13 monochords in the bass instead of 10. I'd be >| > curious to know how many notes on your transition and what the >| > speaking lengths at the beginning and end were. >| > >| > David Love >| >| I left the monochords at ten, and ended up with an A-0 length >| of 1308mm, and transition lengths of 987 at B-2. and 932 at >| D-3. Four notes. It worked real pretty in the spreadsheet, >| and the bridge placement and lengths sound (so far) like I >| won't need any mass loading or even voicing to smooth the >| transition. It's very smooth right out of the box, and I >| don't even have the hammers squared up and strings mated to >| them yet. I seem to have come pretty close. >| >| Ron N >| >| >|
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