Think about your temperament strip.... If scaling considerations permit, it is always nice to have an odd number of bi-chords in the tenor section and an even number in the bass section. ddf | -----Original Message----- | From: pianotech-bounces at ptg.org | [mailto:pianotech-bounces at ptg.org] On Behalf Of Greg Newell | Sent: March 10, 2008 7:15 PM | To: 'Pianotech List' | Subject: RE: Bass Bridge Position | | Ok, something weird just happened. I started a | question/response and it disappeared or accidentally 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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