[pianotech] Scaling Help

[Delwin D Fandrich]

This is the difference between metric sizes and Imperial gages. Order by
diameter, not by gage number.

 

ddf

 

Delwin D Fandrich

Piano Design & Fabrication

6939 Foothill Court SW, Olympia, Washington 98512 USA

Phone  360.515.0119 - Cell  360.388.6525

 <mailto:del at fandrichpiano.com> del at fandrichpiano.com -
<mailto:ddfandrich at gmail.com> ddfandrich at gmail.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Rob McCall
Sent: Thursday, March 31, 2011 11:31 PM
To: pianotech at ptg.org
Subject: [pianotech] Scaling Help

 

Greetings,

 

I have a 2004 - 6'1" Kohler & Campbell KGC650 that I'm restringing (due to
beach rust). I mic'd all the strings (making sure it was on clean wire and
not any rust to interfere) as I removed them and came up with a plain wire
string scale of:

 

notes - wire size

2 - 19 (.043)

2 - 18.5

4 - 18

4 - 17.5

4 - 17

4 - 16.5

4 - 16

4 - 15.5

tenor/treble break

6 - 15

6 - 14.5

6 - 14

treble/high treble break

8 - 13.5

8 - 13 (.031)

 

After removing the strings, I noticed the lightly stamped scale on the back
side of the bridge in the notch. It differed from mine by a 1/2 size across
the board.  In other words, where I mic'd a #19 wire (.043) the scale on the
bridge showed 19.5.

 

I called Samick and they sent me a similar scale as to what is on the
bridge.

 

The exception is that in the high treble, where I show 8 - 13.5 and 8 -
13's, they show 

 

6 - 14

10 - 13.5 

 

Again these  numbers are half a number higher than what I mic'd.

 

Originally, I started to restring based on the scale from Samick, using the
factory numbers, but using Mapes IGS with the corresponding number.  That's
when I heard that wire from Asian market pianos can be 1/2 size different
than the American scale. I'm unable to find any definitive data on that,
however.  

 

Now I fear I may be putting a wire on this piano that is 1/2 size larger
than what it's supposed to be. Unsure of which scale to use now, I measured
everything and input all the data in ScaleRipper and uploaded the file on
yousendit.com.

 

Anyone that can take a look at the data and offer some help would be much
appreciated.  Here's the link for the scale ripper download.

 

This first link is the Samick data using Mapes sized wire. In other words,
possibly 1/2 size too big.

 

https://www.yousendit.com/download/UFh2RkJlZ2pJMHMwTVE9PQ

 

This is the data I input based on what I mic'd. This is what was removed
from the piano.

 

https://www.yousendit.com/download/UFh2RkJRdWNoeVpFQlE9PQ

 

Let me know if you want the file emailed directly.  I put it on
yousendit.com because I was unsure of the file making it through the filters
on the pianotech list.  Let me know if you want the file emailed directly.
The downloads are safe.

 

The bass strings I'm not worried about.  They were mic'd, measured and
ordered from Heller Bass in Germany. They just arrived last week. The bass
data in the scale ripper files are based on what was removed from the piano.
I still had those at home...

 

The good news is that I've only done about 15 notes.  So as unthinkable as
it is of having to rewire those, it's a whole lot better than finding out
after I was all done! :-)

 

Thanks for any and all help.

 

Regards,

 

Rob McCall

 

McCall Piano Service, LLC
www.mccallpiano.com

Murrieta, CA

951-698-1875

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20110401/bd1e5f53/attachment.htm>