Flange Center Friction Increase

[Isaac sur Noos]

I agree, at this moment I just have read a complete course on repining
that was gently given to me by the Renner's people, and some points
that I find important just appears.
1° Always put back a center pin in the same direction it was inserted
at first - as pinning is generally done by a machine with short center
pins, the insertion direction is where the pin is yet plated, or the
opposite is where we can see the cutting marks.

When reaming , always ream in the same direction, to keep the fiber in
line.

Always burnish, also the same direction - for that reason it is
considered a better method to use the long center pin, when, inserted
all along and passing thru the flange (with pliers a good straight one
pass move is considered) , they burnish the bushing and we avoid the
use of the burnished.

A support is used to hold the flange, a lithe strong plank with a saw
line at the top (and a little metal plate if wanted)

Since then, I have done 3 pinning jobs, with a much better
consistency, and avoiding the need to go thru 2 sizes when one was
enough.

I have taken back in service the set of long (2") center pins I had.
For some reason I had stopped using them, as many techs here, using
them gives a very good feel on what goes on in the flange, much more
than with the little ones, so I'll keep that method for the moment.
Having to pass thru with a long wire may look tedious, but in fact it
is done easily, with a little force because of the Birdseye (when
there is one) flat pliers and the wooden support make that job easier
than I thought at first (and it was the original method I learned, as
usual, back to the old good methods ;>)

About Birdseye too free, this is not a defect I see often, very rarely
in fact. I believe it arise when the pinning is done too late (or if
the wood used is not fine grained enough) if the hammers are not
traveling in a "straight" line also, that makes for a lot of problems
sooner or later.
Nowadays that seem to be the problem with Terrys flanges.

Best to all, and think of your holidays now !

Isaac O





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 : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Scott Jackson
> Envoyé : dimanche 20 juillet 2003 11:50
> À : Pianotech
> Objet : Re: Flange Center Friction Increase
>
>
> No matter how 'gently' i try, i have never been able to put
> a cut centre pin back in a bushing without knocking out the
> cloth! I would not recommend trying this to anyone (unless
> they really want practise at re-bushing flanges!).
>
> Scott Jackson
> Australia
>
> ----- Original Message -----
> From: "Paul Chick (Earthlink)" <tune4@earthlink.net>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Saturday, July 19, 2003 10:07 AM
> Subject: RE: Flange Center Friction Increase
>
>
> | Terry
> | Isaac Sadisgursky talked about this in his class on
> center pins at the
> | Convention.  He demonstrated how a center pin can be too
> tight in the
> | bushing cloth and loose through the wood, just the
> opposite of what it
> | should be.  This problem can be spotted as you
> describe--fewer swings as you
> | go along.  Here's his test: carefully remove the center
> pin from an
> | offending flange. Gently place it back in the bushed
> flange and check the
> | friction just by pushing the pin with your fingernail.
> Now place the same
> | pin in the wood and push it with your fingernail.
> Chances are you can push
> | it right through the wood.  The problem is caused by
> using the assembly wire
> | used in the flange to size the bushing cloth during
> manufacturing.  When the
> | flange is installed, the worker slides the wire back to
> clear the other
> | member then slides it through and cuts it to length,
> fitting done.  Isaac
> | says to watch for centers that are clipped on both sides
> of the flange.
> | This will tell you a wire had been used.  He then went on
> to demonstrate how
> | to repin a set of flanges in about 45 minutes.
> | Paul C
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