Steinway "pinning" dilemma - friction drop after pinning (fwd)

[Fred Sturm]

---------- Forwarded Message ----------
Date: Monday, October 13, 2003 7:07 AM +0200
From: Isaac sur Noos <oleg-i@noos.fr>
To: fssturm@unm.edu
Subject: RE: Steinway "pinning" dilemma - friction drop after pinning

Fred,

In europe, these center pins "fils de centre" where the usual material
used for repinning jobs. I am surprized they don't exist in USA, the
factory may have been machine pinning very early there.

The short pins we use appears in the 60' and everybody find them very
convenient (easier to have it in the field, less physical to pass the
thru the birdseye) but they primarly came from machine pinning.

But the long original material is yet sold and is used by the best
shops and repair facility.

I can order mine at Renner's, Jahnn, Baumgartel, or even in France,
and more, they are cheaper than the 100 parts pouches of center pins
sold actually.

As every size is availeable, they made very convenient reamers,
burnishers, etc. In fact when I learned reamers where made with a
lenght of those center pins, roughened on a little place under 2 files
(and every one use these kind of reamers in France yet today)

I did not new Don Mannino was saying the same instructions with its
broaches, I thought they where sold with a handle on them.

I was suspecting you did not have those long center pins for some
time, but was not sure.

Ask Renner to import them, these are very useful material : size is 60
cm in fact, they are sold approx 0.9 ? (or$) each, that is cheaper if
you do a lot of pinning.
Once you get use to them, they are veery fast and accurate. because of
the lenght, indeed some (light) force is necessary to pull them thru
the parts, but the use of the "pinning plank" helps to be in a
comfortable position.

Have a nice day, I have to go now !
Did you receive the picture ?

I'll keep you posted for the Caut document.

Greetings

P.S Please update my Email adress to oleg-i@noos.fr (ISP change)
thanks

Isaac OLEG

Entretien et réparation 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 : fssturm@unm.edu [mailto:fssturm@unm.edu]
> Envoyé : lundi 13 octobre 2003 05:32
> À : oleg-i@noos.fr; College and University Technicians
> Objet : RE: Steinway "pinning" dilemma - friction drop after pinning
>
>
> Hi Isaac,
>    50 cm centerpins, you say? What is the source for these?
> I have never seen or
> heard of such a thing. Joe Goss is selling what amounts to
> more or less the
> same thing, I think, except it is lengths of music wire
> (with a somewhat
> sharpened end) of the same diameter as centerpins. Same
> theory. Instead of
> working a shorter reamer back and forth, you draw a longer
> reamer through in
> one direction.
>    The single correct direction is an interesting idea. I
> had thought the cloth was
> more or less consistent in either direction. But even if it
> is, it might be good to
> work in just one direction so as to keep "brushing" the
> fibers the same way
> rather than back and forth. Would lead to less "bunching
> up" and probably more
> lasting results, which is what you and Don Mannino seem to
> be saying.
> Regards,
> Fred Sturm
> University of New Mexico
>
> Quoting Isaac sur Noos <oleg-i@noos.fr>:
>
> > Fred,
> >
> > I was experiencing the same frictionnal drop after pinning, till I
> > begin to use this process :
> >
> > 1? Always work the bushing in the same direction than the original
> > insertion.
> > it is easealy seen because original was machine pinned,
> the cut side
> > is the output side. This instruction was said to be of primal
> > importance (and funny enough that was the way I've learned to re
> > pin,
> > without understanding it all !).
> >
> > 	I made my reamers with lenghts of centerpin,
> roughened on a small
> > surface under 2 soft files, and checked with the
> micrometer. Then I
> > can insert the reamer from one side and have it out in one move
> > only.
> >
> > This bushing fiber direction , provided by Renner Germany, was an
> > eye
> > opener to me. New bushings (cloth and center)are to be treated the
> > same. This way the fiber inside the bushing stay undisturbed.
> >
> > 2? if you plan to use pre-cut center pin, always burnish,
> but again,
> > in the same direction only. I use metal burnishers of any
> sise sold
> > by
> > Renner - without handle , long center pins may well be OK too.
> >
> > The preferred solution in fact actually, is to use the long
> > centerpin
> > for repinning. These are 50 cm long approx with a very sharp end I
> > catch with flat pliers.  The flange/shank itself is stopped in a
> > vertical plank with a vertical saw cut in, I catch the
> extremity of
> > the long center pin and pull it all along in one firm move.
> > This way I don't have to burnish, the heat generated by
> the friction
> > does the job well. Centerpins have to be cleaned with pure alcohol
> > from time to time.
> >
> >
> > Since using this process (a few months) I have consistent results,
> > and
> > the friction change is far less noticeable, other
> advantage is that
> > the minimal work is necessary, and I almost alway can use only one
> > size more.
> >
> >
> > Drawback is of course that my nice reamers with their handle,
> > numbered, are now useless
> >
> > Did not process on complete repinning jobs recently, but it may be
> > done very quickly with this method. In fact Abel sell us complete
> > pinning jobs for 70$ (?), so they may not pass more than 1.5 h. on
> > each I guess.
> >
> > Please give a try and let us know what you find !
> >
> > Best Regards.
> >
> > Isaac OLEG
> >
> > Entretien et reparation 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
> >
>


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