Bass Bridge Position

[Greg Newell]

Del,
	Could you explain why five notes on the transition bridge makes life
easier for the tuner? Are you favoring

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
| 
| 
|