Metric Center Pin Sizes

[Jurgen Goering]

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Hi  Joe,
The beauty of working with the rods is that the beginning of the rod is 
a straight reamer of the exact size you need.  The middle part of the 
rod is used as a burnisher, again of the exact size.  The flange is 
finally moved to the end and the rod is cut off.  Voila: a re-pinned flange.

While there are 25 sizes available, the most common pins used for pianos 
range from  1.275 mm to 1.50 mm (.050 to  .059").  The other sizes have 
other applications for harpsichords, orchestrions, etc.  I have about 14 
sizes in stock, of which I carry 10 or so in my tool kit.
The pin sizes are not assigned numbers.  A 1.1o mm pin is called a 
"1.10", a 1.70 mm is a "1.70".  That's it.  I am speaking of the German 
center pins here.  I don't know what they do in Japan.

Jurgen Goering
Piano Forte Supply
Vancouver Island, Canada

>
> Subject:
> Re: Metric Center Pin Sizes
> From:
> "Joe And Penny Goss" <imatunr@srvinet.com>
> Date:
> Thu, 5 Aug 2004 22:05:20 -0600
> To:
> "Pianotech" <pianotech@ptg.org>
>
>
> Hi Jurgen,
> Yes that is why who whats up and when I am confused and do not want to 
> proceed untill we have the correct measurments for pins. While in 
> Tokyo last week we tried to take measurments at a piano tuning school. 
> The pins were in a center pin storage box like we use here but several 
> sizes were missing and did not want to embarrass my host with pointing 
> this out in front of his students. I realize that the pins that were 
> measured might have been in the wrong bin as well.
> Also here in the states we sometimes repin one flange that has become 
> loose on one or both sides as well as repin flanges that are too tight 
> using a special set of reamers that are exactly the correct size to do 
> the job. We do  ( well most of us ) not use the old triangle reamer 
> that was used in the past.
>  
> What number is assigned to the 1.10 mm pin and to the 1.70 pin?
> Joe Goss RPT
>
> Hi again,
> Jurgen, are you telling me that you use 25 sizes of pins?
> What are the size of the ones most used?
> Which ones do techs carry into a house for common repair?
> Joe Goss RPT
> Mother Goose Tools
> imatunr@srvinet.com <mailto:imatunr@srvinet.com>
> www.mothergoosetools.com <http://www.mothergoosetools.com>
>
>     ----- Original Message -----
>     From: Jurgen Goering <mailto:pianoforte@island.net>
>     To: pianotech@ptg.org <mailto:pianotech@ptg.org>
>     Sent: Thursday, August 05, 2004 8:57 PM
>     Subject: Metric Center Pin Sizes
>
>     List -
>
>     I think German piano wire gauges are being mistaken for center pin
>     sizes.  German piano wire sizes differ slightly from American
>     gauges, but Joe Goss asked about center pin sizes.
>
>     German center pins are not identified by any gauge, but by their
>     thickness, e.g a pin with a diameter of 1.30 mm is called "1.30". 
>     Very simple, actually.  Center pins are available from 1.10 mm
>     through 1.70 mm in increments of  .025mm  (.043" to .067"
>     increments of .001")   The conversion factor is 25.4.  
>
>     The traditional European method of (re-)pinning uses 60cm (2 ft.)
>     long center pin rods.  One of these days I might write a little
>     piece on that.  If anyone is interested in these rods, visit my
>     website:  www.pianofortesupply.com
>
>     Jurgen Goering
>     Piano Forte Supply
>
>

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