Ricostruzione pistoni

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Marco Muttinelli
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Ricostruzione pistoni

Messaggio da Marco Muttinelli »

Uno dei problemi che può affliggere gli strumenti vintage, soprattutto quelli più antichi, è l'usura dei pistoni e/o camicie. Dr. Valve negli States ha messo a punto un sistema di ricostruzione per i pistoni. Idee in merito?


the SPECIAL ist
mail: c.g.conn.expert@gmail.com

Trumpet
22B New York Symphony 1940; 12B Coprion Special 1940; 8B Artist 1965; 6B Victor 1968
Buescher The 400 T225 1937

Cornet
Perfected Wonder e Perfected ConnQueror 1907; 82A Victor 1925; 38A Victor Special 1937; 38A Connstellation 1968


Fluegelhorn
Couesnon Monopole ?


Mouthpiece
serie Famous Artist: BI-220, BI-225, BI-420 e AI-312
serie Precision: 4 (tp)
serie Improved Precision: 4 e 5 (tp); 3 e 4 (cn)
serie Connstellation: 5 B-N, 5 B-W, 7 B-N, 9 B-W (tp)
serie E-Z Tone: Tp e Cn varie epoche
Denis Wick: 4FL, 4BFL, 5EFL (fl); 4 Classic (cn)
stefano bartoli
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Re: Ricostruzione pistoni

Messaggio da stefano bartoli »

Alesare le camicie e cambiare le fasce, solitamente funziona...
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Marco Muttinelli
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Re: Ricostruzione pistoni

Messaggio da Marco Muttinelli »

stefano bartoli ha scritto:Alesare le camicie e cambiare le fasce, solitamente funziona...
Mi puoi illustrare meglio il processo?
the SPECIAL ist
mail: c.g.conn.expert@gmail.com

Trumpet
22B New York Symphony 1940; 12B Coprion Special 1940; 8B Artist 1965; 6B Victor 1968
Buescher The 400 T225 1937

Cornet
Perfected Wonder e Perfected ConnQueror 1907; 82A Victor 1925; 38A Victor Special 1937; 38A Connstellation 1968


Fluegelhorn
Couesnon Monopole ?


Mouthpiece
serie Famous Artist: BI-220, BI-225, BI-420 e AI-312
serie Precision: 4 (tp)
serie Improved Precision: 4 e 5 (tp); 3 e 4 (cn)
serie Connstellation: 5 B-N, 5 B-W, 7 B-N, 9 B-W (tp)
serie E-Z Tone: Tp e Cn varie epoche
Denis Wick: 4FL, 4BFL, 5EFL (fl); 4 Classic (cn)
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Zosimo
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Re: Ricostruzione pistoni

Messaggio da Zosimo »

Il buon Stefano, si è confuso con i pistoni delle ''maghine'' : Lol :
Trombe Bb: Cinesina, Holton Revelation 1923, Carol Brass 5000
Martin Commitee 1948
Cornetta Bb: Conn 77A 1960
Flicorno: Couesnon Monopole Conservatorie 1960 o giù di lì
Bocchini: Un secchio
Non importa se la storia vintage sugli strumenti sia vera, l'importante che sia una bella storia.
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Marco Muttinelli
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Re: Ricostruzione pistoni

Messaggio da Marco Muttinelli »

: Lol : : WohoW :
the SPECIAL ist
mail: c.g.conn.expert@gmail.com

Trumpet
22B New York Symphony 1940; 12B Coprion Special 1940; 8B Artist 1965; 6B Victor 1968
Buescher The 400 T225 1937

Cornet
Perfected Wonder e Perfected ConnQueror 1907; 82A Victor 1925; 38A Victor Special 1937; 38A Connstellation 1968


Fluegelhorn
Couesnon Monopole ?


Mouthpiece
serie Famous Artist: BI-220, BI-225, BI-420 e AI-312
serie Precision: 4 (tp)
serie Improved Precision: 4 e 5 (tp); 3 e 4 (cn)
serie Connstellation: 5 B-N, 5 B-W, 7 B-N, 9 B-W (tp)
serie E-Z Tone: Tp e Cn varie epoche
Denis Wick: 4FL, 4BFL, 5EFL (fl); 4 Classic (cn)
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Marco Muttinelli
Site Admin
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Messaggi: 3025
Iscritto il: 12/04/2019, 10:39
Thanks dati: 460
Thanks ricevuti: 389

Re: Ricostruzione pistoni

Messaggio da Marco Muttinelli »

Intanto riporto qui quanto descritto sul sito di Doctor Valve:

http://www.doctorvalve.com/Services.html

"Valve Overhaul or Valve Job

A Doctor Valve valve overhaul (aka "valve job") is a procedure that restores the fit of the valves to "like new," or often "better than new" condition.

It begins with a play test of the horn (when playable) so that I have a baseline for that particular horn. During this process, I make notes about any playing anomalies and well as the overall characteristics of the sound and blowing feel.

Next, the horn is disassembled, measured. and visually inspected. Some instruments will require a chem-clean, which will be done at this point. The casings are lightly honed to check for any serious washouts or other problems. The valves and casing are then precisely measured to determine the necessary amount of plating build-up.

The valves are trued and sized on the hone in preparation for plating. Next, with a "Shielded Port" valve overhaul, the valve ports are then precisely shielded, so that the windways in the valves retain their exact original size. With an "Unshielded Port" overhaul, this step is not executed. Other than this one difference, the Shielded and Unshielded port overhauls are identical.

After another cleaning, the valves are carefully packed, and sent to Anderson's. There they are built up with hard nickel plating.

Upon return from the platers, the valves are honed to a size slightly above the casing dimension, then the casings are carefully honed to the point where the valves have the exact proper fit.

Each valve is then expertly hand lapped into its respective casing. The finished piston surface to casing wall fit yields a tolerance of approximately .0005" (half a thousandth of an inch.)

The horn and parts are then ultrasonically cleaned, and the instrument is reassembled with new valve pads and felts, valve springs, and waterkey corks.

It is then tested to assure proper playing function and playing characteristics. Any final tweaks are made and plated instruments are then given a complete polish job using 3M Tarni-shield polish. The finished horn is now ready for return shipping or customer pick-up.

A special note about NY Bachs and instruments of "extreme age" or with severely damaged valves: In some of these cases, it is necessary to do a two-step valve build-up process. This entails more work, and two trips to the platers. I only do this when the required build-up is too great to do in a single nickel plating step. NY Bach valves were chrome plated at the factory, and in order to achieve good results, this chrome has to be completely removed from the outer valve surfaces prior to the build-up. On some NY horns, I have been able to do the valves with a one-step plating build-up (the usual method). On the other hand, some of these instruments do require a two-step plating process, because once the chrome is removed, the valves require a bigger build than is advisable in just nickel. In these cases, the valves get a first round build in copper, are re-honed and trued, re-shielded, and then sent to Anderson's a second time for the final nickel plating.

If the two-step plating process is required, add $225 for an initial copper build.

There is a $30 shipping charge for shipping the valves to the platers and back to the shop."
the SPECIAL ist
mail: c.g.conn.expert@gmail.com

Trumpet
22B New York Symphony 1940; 12B Coprion Special 1940; 8B Artist 1965; 6B Victor 1968
Buescher The 400 T225 1937

Cornet
Perfected Wonder e Perfected ConnQueror 1907; 82A Victor 1925; 38A Victor Special 1937; 38A Connstellation 1968


Fluegelhorn
Couesnon Monopole ?


Mouthpiece
serie Famous Artist: BI-220, BI-225, BI-420 e AI-312
serie Precision: 4 (tp)
serie Improved Precision: 4 e 5 (tp); 3 e 4 (cn)
serie Connstellation: 5 B-N, 5 B-W, 7 B-N, 9 B-W (tp)
serie E-Z Tone: Tp e Cn varie epoche
Denis Wick: 4FL, 4BFL, 5EFL (fl); 4 Classic (cn)
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