Virtual Capstan

[antares@euronet.nl]

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We will order these magnets immediately on Monday.
Richard has a web site where you can obtain 'his' magnets. They are=20
inexpensive and very strong. I certainly believe in this man! What an=20
invention.
I already forgot about the springs, although I have them in our grand=20
piano.
If this works with the magnets I will remove the springs right away and=20=

replace them with magnets.

EAR


On zaterdag, jun 21, 2003, at 12:15 Europe/Amsterdam, Isaac OLEG wrote:

> Hi, what a great setup !
> =A0
> It may certainly produce the same effect on touch that the assist=20
> springs.
> =A0
> I am unsure of the magnets, I used to buy some ceramic magnets in=20
> time, and they where VERY expensive, and very strong, don't get=20
> demagnetized with time, and so on.
> Are they the same or the same kind, that should price less actually.
> =A0
> Amazing, congratulations Ric.
> =A0
> I may think about it now !
> =A0
> Greetings.
> =A0
>
> Isaac OLEG
>
> Entretien et r=E9paration de pianos.
>
> PianoTech
> 17 rue de Choisy
> 94400 VITRY sur SEINE
> FRANCE
> tel : 033 01 47 18 06 98
> fax : 033 01 47 18 06 90
> cell: 06 60 42 58 77
>
> -----Message d'origine-----
> De=A0: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De =
la=20
> part de Richard Brekne
> Envoy=E9=A0: vendredi 20 juin 2003 16:45
> =C0=A0: PTG
> Objet=A0: Re: Virtual Capstan
>
> Hi folks
>
> I managed to find a few Neodym Magnets of an appropriate dimension=20
> today. These are much stronger and probably more or less what should=20=

> be used for this application.
>
> Each weighs about 0.8 grams, and has quite a bit more energy then the=20=

> ones I posted figures for earlier on.
>
> So below is a picture with a very basic way of installing them and the=20=

> resulting figures. I changed a tight center on the hammershank flange=20=

> so the non magnet figures are slightly different. We have:
>
> 30 grams FW
>
> No magnents=A0=A0=A0 DW/UW=A0 50/31
>
> Magnets at 10 mm seperation DW/UW 48/30
>
> Magnets at 6 mm seperation=A0=A0 DW/UW 43/26
>
> Total weight of the added parts was 6.3 grams
>
> Not much mass, lots of distance, and more effect then will ever be=20
> needed. One thing I noticed already about the touch. The key gets an=20=

> extra shove down, yet there is no real bump with the wippen coming=20
> back into contact... because the magnets insure a soft landing as it=20=

> were.
> =A0
>
<image.tiff>
> =A0
>
> Cheers
>
> A good technician friend of mine and I are going to work up a really=20=

> nice installation proceedure and presentation after we finish refining=20=

> this angle on the idea and testing it out on an August Forster Grand.
>
> Total cost... about 3 hours work for installation, and about 40 cents=20=

> a magnet or just under a 150 dollars if you use four as in the=20
> example. Looks to me tho that you could easily use just 3, if not 2=20
> and still get plenty effect while still leaving more then ample space=20=

> for regulating the standard capstan.
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
> http://www.hf.uib.no/grieg/personer/cv_RB.html
> =A0
>
>


Antares,
The Netherlands

see my web site : www.concertpianoservice.nl
and : www.grandpiano.nl

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