hosted on condor3913
 Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > July 2002 > 2002.07.01 > 08Prev  Next

Small Hole Brass Bleed Cups
By Craig Brougher

No Gulbransen player piano, to my knowledge, used a #71 bleed.  The
pouches are small, but not even primaries use that size.  The Ampico
model B used a fixed #71 bleed in addition to the ball bleed, but that
was only to start the valve off it's inside seat.

I would suggest guessing at this if you don't have an original bleed,
and trying the #63 cups.  If you then need a smaller hole (which you
won't), you can paint them with something that will fill in the bleed
hole and redrill, or which will resize the hole with a coating.

If you have an original bleed, use a jeweler's drill set, and find the
correct drill that just fits the hole.

When unsealed pouch leather is used, it's seepage exceeds the bleed.
In that case, the bleed is just there to even out the average bleed for
all valves.  When sealed pouch leather is used, if rubber cement is the
sealant, it's usually too stiff, because rebuilders wrongly apply the
cement after the leather is mounted as a pouch!  That's called "wrong!"
If you use rubber cement, you apply it to the entire area of the skin
that you intend to punch out, first.

Usually, nothing happens to bleeds in a player, except they get filled
with lint and dirt, sometimes.  Brass bleeds do not wear out.  So unless
the bleed cups were for some strange reason removed, there is no reason
to replace them.  If you have a repetition problem, the problem is not
"bleed cups."

Craig Brougher

(Message sent Mon 1 Jul 2002, 13:39:20 GMT, from time zone GMT-0700.)

Key Words in Subject:  Bleed, Brass, Cups, Hole, Small

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2023 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

Translate This Page