Repinning flanges: Unusual discovery and solution

[David Love]

Isaac:

I clean the roughened part of the wire broaches with a brass brush as is
used for suede.  It cleans the debris out of the textured surface without
dulling the cutting edges.  I would normally just use it every few flanges.


This particular piano is due for tuning in a couple of months, so I will
have the opportunity to see if the pinning has held up.  

David Love
davidlovepianos@earthlink.net


> [Original Message]
> From: Isaac OLEG <oleg-i@wanadoo.fr>
> To: Pianotech <pianotech@ptg.org>; <davidlovepianos@earthlink.net>
> Date: 4/10/2003 11:52:45 PM
> Subject: RE: Repinning flanges: Unusual discovery and solution
>
>
> Hello, David
>
> Protek :
>
> I suspect it had, but mostly because of the falseness of the
> "temporary" friction evaluation (may be what you call "the reamer
> where more efficient").
>
> Have find hammers sticking up a few weeks later (grand) on a recently
> repined job (all centers)
> Not to afraid you, but possible call back , I had some for that
> reason. There is something of a mistery, as on some flanges there is
> only a return to slugginess as original, and on others , may be a
> reaction with the plating, or whith graphite on the bushing, or
> whatever, but the slugginess is more pronounced after presence of CLP)
>
> I had also used Protek on the center pin (in their holder) with the
> same result.
> Did not figure a good method to take in account the change due to the
> Protek.
>
> Nowadays I only consider this magical product to be a no fix in many
> case, a temporary one in some others, and of no help on plastic
> flanges (as we all learned the hard way finally).
>
> too bad, but I am faster on repining now !
>
> I was told Yamaha pinning is treated - when inserted with some mix,
> may be sillicon, may be teflon, any precise info welcome.
>
> A product is always (?) used in the (Renner) factory to insert pins in
> the new bushings, it is for what I know generally alcohol/water mix
> (how strong ?)
>
>
> BTW In the process of repining, we usually use long center wires (that
> are still sold at Renner and others) as we had for some time on very
> old instruments - one center meaning 20- 22 flanges for instance.
> We roughen the center between 2 fine files at some center place, and
> check the size (usually on size more with the roughening).
> When during pinning, the center become cloaked with dirt or whatever
> product have been use on the flange bushing previously,  we "clean"
> the reamer with 2 files, so it stay cutting and the job is not as
> slow.
>
> I like the metal broaches, they stay straight and are more accurate,
> but they finally get dirty and less efficient, so the result on the
> middle of the set is not really the same that at the beginning, how do
> you clean them ? if roughened they loose more thickness than wanted I
> find (while the normal plated pin grows when roughened).
>
> Have a good day every one !
>
>
> 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
>
> > -----Message d'origine-----
> > De : pianotech-bounces@ptg.org
> > [mailto:pianotech-bounces@ptg.org]De la
> > part de David Love
> > Envoye : vendredi 11 avril 2003 08:14
> > A : Pianotech
> > Objet : Repinning flanges: Unusual discovery and solution
> >
> >
> > Found an interesting thing today.  Went to tune a S&S B for
> > the first time
> > and found the action clickety clacking all over the place.
> > Pulled that
> > action to check the hammer glue joints and pinning.  Glue
> > joints were fine
> > so I took off a hammer/shank/flange assembly to check the
> > pinning.  Swung
> > the flange and I think it would still be swinging if I
> > hadn't stopped it.
> > Eyeballed the center pin as I rotated the flange and
> > noticed that the pin,
> > instead of rotating in the bushing, didn't move.  I popped
> > out the center
> > pin which came out with some difficulty.  Testing the fit
> > through the
> > wooden eye, the pin literally fell through of its own
> > weight.  The fit in
> > the bushing, on the other hand, was so tight, I was unable
> > to reinsert it
> > by hand.  As it turns out, the action had been repinned
> > fairly recently.
> > Unfortunately, they got it backwards and had all the
> > centers fitting quite
> > snugly in the bushings and rotating quite freely in the
> > eye.  The flanges
> > were certainly free, and also quite noisy.
> >
> > In the process of repinning the action using broaches, I
> > found that the
> > roughened part of the broach kept clogging with felt which
> > reduced it's
> > cutting efficiency.  I discovered that putting a drop of
> > Protek on the
> > bushing before inserting the broach seemed to speed up the
> > cutting action
> > of the broach as well as prevent the roughened area of the
> > broach from
> > clogging with felt.  I went through the action quite
> > quickly, repinned the
> > whole set of flanges and only at the end began to wonder if
> > using Protek
> > for this purpose might, for reasons unbeknownst to me,
> > create problems
> > later on.  I couldn't imagine why it might, but,
> > admittedly, paranoid
> > fantasies did begin to creep in.  Anyone else use this
> > method?  And have
> > you found any problems, or benefits?
> >
> >
> > David Love
> > davidlovepianos@earthlink.net
> >
> >
> >
> > _______________________________________________
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> >