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

End-of-Summer Fundraising Drive In Progress. Please visit our home page to see this and other announcements: https://www.mmdigest.com     Thank you. --Jody

MMD > Archives > October 2015 > 2015.10.04 > 08Prev  Next


Ampico A Equalizer Springs
By Bob Taylor

[ Ref. 151003 MMDigest, Seek Ampico Equaliser Springs ]

Hi Peter,  I think your best option is to make the springs from
scratch.  Chances are, any original springs you might buy will be
the wrong length.   Use these dimensions:

  wire size: 0.048 inches
  coil size: 0.990 inches

The length is highly variable, from about 0.75 inch to 2.5 or
more inches (coil fully collapsed, not counting connection loops).
Except for upright pianos, these springs are variable in length due
to space limitations.  On grands, the two springs are almost always
different lengths.

Once the minimum stack pressures are known for reliable soft playing,
the spring length should be adjusted to just barely allow the equalizer
to fully collapse at that pressure.  When a transient pressure drop
occurs, the equalizer is pulled open immediately to counter-act the
drop in stack vacuum.  It takes several tries to get the balance
perfect.  The equalizers are always fully collapsed at intensities
above the minimum 1st intensity setting.

Let me know if you need any other information.

Now Robbie has to figure out how to archive this topic: English
spelling or U. S. spelling.

Bob Taylor
Missouri

 [ Hereafter I'll observe the (American) spelling found
 [ in the Ampico Inspectors Reference Booklet of 1923.  ;-)
 [ MMDigest articles on this topic are indexed at
 [ http://www.mmdigest.com/Archives/KWIC/E/equalizer.html 
 [ -- Robbie


(Message sent Sun 4 Oct 2015, 20:01:21 GMT, from time zone GMT-0500.)

Key Words in Subject:  Ampico, Equalizer, Springs

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 1995-2022 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

Pay via PayPal

No PayPal account required

                                     
Translate This Page