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 > January 2007 > 2007.01.25 > 04Prev  Next

Quality of Materials & Testing Pneumatic Cloth
By John A. Tuttle

Hi All,  I would agree with Jim McFarland's rebuttal to my testing
procedure with the exception that the problems most often associated
with bad pneumatic cloth have generally been that the cloth was
defective from the factory, i.e., that the layer of air-tight material
was not uniform.

Naturally, if there are any pin holes in the cloth, this indicates
an area that is very thin, not just that there is just a hole in the
cloth.  Ergo, those area around the pin hole are much thinner, and will
wear out more quickly.  So, in essence, running a real-time test will
render the same basic results without the effort of making a bellow
and opening and closing it thousands of times.  Furthermore,  you
still have inescapable "other factors" which can influence the outcome
of the test.

Also, the clay content in cloth, which can be tested to a degree
with sunlight, is another real problem that also shows up in real-time
testing.  However, it too requires the construction of a bellows
assembly of some sort, and at the risk of sounding redundant, involves
other factors which influence the final results.  Naturally, one could
also test all of those other factors, and, finding them to be the same
as they were prior to the test, could arrive at the conclusion that the
cloth broke down prematurely.  But why go to all that hassle.

My example of the pouch material was only given to prove, to some
extent, that real time testing can render results that are far from
accurate.  And, in that regard, perhaps there is some merit to running
both tests.  But, in my opinion, the cart has to come before the horse.

John A Tuttle
Brick, New Jersey, USA

(Message sent Thu 25 Jan 2007, 12:50:25 GMT, from time zone GMT-0500.)

Key Words in Subject:  Cloth, Materials, Pneumatic, Quality, Testing

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

Pay via PayPal

No PayPal account required

Translate This Page