[pianotech] Modified L Scale with 5 note transition

[David Love]

I set up my spread sheet a few years ago and did it originally all from
Robert's book.  Since then it's gone through some iterations and to be
honest I don't now recall whose formula is on there.  Once I get them onto
the spread sheet the formulas have a way of disappearing from my
consciousness.

 

I do different things with respect to rib arrays.  All projects employ bass
cutoff bars.  I generally install straight ones as they're easier to clamp
when you don't want to cut the board, which I don't.  They all connect to
the belly rail in about the same spot somewhere around note 50 and shorten
the longest ribs lower in the rib scale to around 800 - 850 mm.  Some have a
treble fish and some don't.  I don't always lay in a new rib array but if I
do it's radialized.  The two projects pictured use the original rib
locations.  I don't know what a "Z bar" is.  At least not by that name.  

 

I've gone back and forth between new and original rib locations depending on
the customer's goals (new rib arrays cost more), and also to explore select
variable changes as a mode of comparison.  As Ron mentioned what would be
really nice is to get 5 or 6 of the same piano and do a sequence where you
change select variables to see what happens and give you side by side
comparison.  This job could be so much more fun if we didn't have to worry
about making money doing it.


 

To copy a chart to email (with a PC), open the excel spread sheet and open
the new email.  Go to the excel sheet and click on the chart, hit Ctrl C to
copy the chart (or anything else for that matter--keyboard shortcut).  Go to
the email put the curser on the email where you want the chart to appear and
hit Ctrl V to copy.  Very easy.  Don't know on a Mac.  You need to be in
HTML format which means the chart won’t get into the archives.  Won’t work
in plain text.

 

BTW, here’s the latest scale iteration (Steinway L) having had to make a few
concessions on the long bridge down in the tenor section.

You can kind of play with these things forever but at some point you do
actually have to make a decision and build it.    

 

    

 



 

 

 

 

 

David Love

www.davidlovepianos.com

 

 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jude Reveley (Absolute Piano)
Sent: Thursday, May 28, 2009 11:17 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Modified L Scale with 5 note transition

 

Here are the two versions I'm aware of:

 

Z=(d²NLf)/.02078 published by Jim Hayes

Z=d(NT(1+B))^0.5 published by Dave Roberts

 

Nice work David. I like your approach to the transitions, although like so 

much else I would love to hear it to know for sure. This shape is very 

classic (Hallet & Davis did this but added wound trichords instead of 

bichords. I've got a few in the oven so I should have a better idea soon. My


first transitional bridge was on my first RC&S project that Ron Nossamon 

designed for me about a year and a half ago. It's definitely an 

exponentially better piano than anything I've ever done in that class and 

turned me on to this wonderful world. Thanks Ron.

 

Are you throwing in Z-bars and radial rib arrays on all the pianos you add 

transitions too?

 

I've asked this a few times before, but what version of calculating 

inharmonicity are you all using?

 

Finally, how do you attach a graph onto an email?

 

Jude Reveley, RPT

Absolute Piano Restoration, LLC

Lowell, Massachusetts

(978) 323-4545

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090529/a41555e3/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 58969 bytes
Desc: not available
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090529/a41555e3/attachment-0001.png>