Re: [pianotech] String size chart

[Ron Nossaman]

On 8/14/2013 6:09 PM, Barbara Richmond wrote:
>
> Greetings list,
>
> Some time ago someone posted a listing (or excel file) of the different
> brands of wires (Mapes, Roslau, etc) and what the measurement was of
> each size. I know I kept it, but, darn, I can't find it. Can anybody
> out there help me out?

This isn't brand specific, just inches/metric will it do?
Ron N

[Barbara Richmond]

Ron,
Thank you, that helps!
br

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From: "Ron Nossaman" <rnos...@cox.net>
To: pian...@googlegroups.com
Sent: Wednesday, August 14, 2013 8:35:01 PM
Subject: Re: [pianotech] String size chart

[Jurgen G]

There is a bit of confusion regarding wire sizes.  I have been repeatedly contacted by people looking for Röslau wire in "metric sizes".  As I understand the facts, Röslau only manufactures piano wire in European Wire gauge (metric sizes), while American wire manufactures only produce wire in American Wire Gauge (AWG).  These two gauges are not identical at all.

Large American supply houses import Röslau wire in bulk and re-package it in smaller coils.  They then label it with the closest approximation of American Wire Gauge.  But if you measure carefully, you will see that it actually deviates from AWG by up to almost half a wire size.

I will try to attach a comparison table.  (Sorry if the formatting challenges exceeds my lowly Google Groups expertise!)

Example: Röslau 1.000 mm wire (European Gauge #17.5) is re-packaged in the US and labelled as #17 AWG.  But at .0394" diameter, it is in fact a fair bit larger in diameter than #17 AWG, which would be .0390".

So if someone is a stickler for precision and might be working on a piano with metric sized wire, e.g. a Yamaha, a Kawai, a Hamburg Steinway, or perhaps a Bösendorfer Imperial, they may want to make sure they are using the wire size originally used, or at least be cognizant of the discrepancies between wire gauges.

I hope I have not muddied too many waters!

Jurgen Goering

On 8/14/2013 6:09 PM, Barbara Richmond wrote:
>
> Greetings list,
>
> Some time ago someone posted a listing (or excel file) of the different
> brands of wires (Mapes, Roslau, etc) and what the measurement was of
> each size.  I know I kept it, but, darn, I can't find it.  Can anybody
> out there help me out?

 

 

[Barbara Richmond]

Yeah. It's a Yamaha I'm working on.  :-)
br

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From: "Jurgen G" <piano...@pianofortesupply.com>
To: pian...@googlegroups.com
Sent: Thursday, August 15, 2013 2:03:28 AM

Subject: Re: [pianotech] String size chart

[Isaac OLEG]

And is not the Yamaha wire gauge different by one number from Roslau? (my memory begin to be old !!) That is, for the gauge numbers stamped on bridgeor plate.

I also seem to recall that early versions of Poehlmnn wire had a differnt gauge because more numbers where used on the thick ones (raising by 00.25 mm while the thickest ones today are 0.050 mm spaced)

Then We had the French wire Firminy who had gauges as 1.200 1.220 , 1.240, mm etc ,  biggest diameters again more evenly parsed

[Isaac OLEG]

DO someone know if Suzuki use the same gauge ? http://www.suzuki-metal.co.jp/en/ 

May be that piano wire table can help :

https://docs.google.com/file/d/0B6GjQDkF_AMQVnRFenpzNDdoSkU/edit?usp=sharing 

[Isaac OLEG]

MOE of Paulello O (190) not certified. or the one of Mapes wire. steel is supposed to be 205 but are not differences possibles due to carbon content or other composition ?

[Isaac OLEG]

Here is a table with wire gauges for old types (Poehlmann , Berlin, Fimini)  and modern types of steel wire, based on sizes in mm and gauges numbers.

So you have direct correspondence of Mapes with the usual gauges.

About Yamahas I seem to recall that the gauge used was different from the Roslau jauge at some point . I need to investicate that and wonder if that relates to the uise of Suzuki wire or not.

[David Skolnik]

Jurgen -
I was at the piano yesterday and told myself to measure the darn thing, but was running late so, of course, forgot.  Can you tell from the photo how the size might compare to the one you posted? Also, the question stands as to how much (if any) leg modification is required. 

While on the subject, do you have any access to the concert casters like those Steinway uses?  The second picture I sent shows  a full size caster next to a reduced size one that is used on a model B.

Thanks -
David S

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