Broach roughness - Was: Repining flanges -naphtha on residue

[Isaac OLEG]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment
Hello,

some of the old Apsco sets have been sold in Europe if you are looking for
them !

When using the long center pin with a roughened part, the roughened part is
on size more than the original env. I use another one for burnishing. Having
the two on one tool would be very convenient.

I was instructed to use long center pins for pinning jobs, they are cheaper
than pre cut ones, and burnish the felt when inserted, but can only be used
for some vertical pianos (too hard to pass thru the Birdseye a 20 cm long
center pin)

I have used pure Naphtha to clean old gummy (German >> Ballistol or such)
residue that is too often find on old flanges. I always find that the felt
is really brittle after that, and the pinning is taking too much play fast.
that is why I advertise against the use of oily products in the flanges, I
guess they tend to became paraffin like with time, and mixed with dust ,
make really a mess.

I guess there is some lanolin initially in the felt, and it is destroyed
with the naphtha.

In Europe we can ask ABEL (or RENNER) to rebush old flanges for a not too
high price , I did not use that service yet, new flanges if possible are
probably the only solution.

Rebush a set is still a very long job - do some have done it efficiently ?

A last question : do you know what product is used initially for pinning on
KAWAY , if some ?

Best Regards.

Isaac OLEG



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 Donald Mannino
  Envoye : vendredi 11 avril 2003 20:30
  A : Pianotech
  Objet : Re: Broach roughness - Was: Repinning flanges


  Clyde,

  You are right - the old APSCO broaches were really nasty, with the rough
area knurled and much too agressive.  Hopefully Schaff threw them all out
when theybought APSCO, but I don't realyl know.  The rough area is supposed
to be subtly rough, with something like the grit of fine sandpaper, maybe
320 grit or finer.  The point is that the felt should not be chewed up when
reaming, and the reaming area should not be larger than the smooth area, or
the smooth area would not do a good job of burnishing the cloth.

  If the broach gets clogged up, the cloth has very likely been lubricated
with something that has become gummy.  I run into this sometimes, and it
immediately throws up a red flag.  If the cloth is gummy and sticky, there's
a very good chance that reaming and repinning is not going to be a permanent
solution.  The gumminess will rear it's ugly head again, and the action will
go sluggish.  In this case you might consider cleaning all the bushings with
naptha, then keeping a cloth nearby to clean the broach occasionally.

  With clean dry bushing cloth, a quick tap on the edge of the workbench is
all that is needed to shake out any wool dust that has accumulated on the
broach.  I have had broach sets that were used to do many, many sets of
action parts that kept working like new.

  Don Mannino

  At 06:45 AM 4/11/2003 -0400, you wrote:

    Friends,

    I discovered quite by accident at a PTG convention, when looking over
tools,
    that the rough part of broaches can be quite different.  I have used the
same
    set for years, and the rough part is not rough enough to "clog up."
They
    always worked fine for me.

    But I came across a set that was so rough that it looked to me like they
stood
    a good chance of removing too much felt.  I would be afraid to use them
unless
    someone else looked at them and said, "Oh, yes, that's the way my set
is, and
    they work fine."  I'm not going to buy such a set just to try it out.

    Regards,
    Clyde

    David Love wrote:

    > 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.

    _______________________________________________
    pianotech list info: https://www.moypiano.com/resources/#archives

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/52/5e/44/9d/attachment.htm

---------------------- multipart/alternative attachment--