Bass Bridge Position

[Greg Newell]

OIC! I stopped using one of those long ago but I get your point. That's very
thoughtful of you!

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 10:36 PM
To: 'Pianotech List'
Subject: RE: Bass Bridge Position

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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