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

Announcement: Outbound Mail Delivery Broken

We are having a problem with our mail service provider. Inbound mail is working but outbound mail -- specifically for mailing the Digest -- is not working and we know it. Sorry!!! Please bear with us. In the meantime, I will endeavor to keep the MMD website up-to-date with updates DAILY.

Please visit the MMD Archives! Thank you -- Jody

MMD > Archives > May 2005 > 2005.05.03 > 06Prev  Next


Duo-Art Steamboat Pump Belt Replacement
By David Anderson

I have a Steinway vertical in my care which appears to have been very
thoroughly restored, except for the six laminated, riveted leather pump
belts. Two of the belts have given up, and the rest are soon
to follow.  I would like an opinion or two on replacement materials.  I
have read Mr. Brougher's excellent and thorough post in the archives,
but would like some further information from the experienced souls on
this list.

I don't know how many variations there are on this pump, but
here are the details of the one in question.  It has two V-belts from
the motor to the countershaft, and four from the countershaft to the
pump, on machined ferrous pulleys, all in good condition, and a
wood-faced idler, also in good shape, except for a generous buildup of
waxy belt dressing and leather bits.  They all appear to be very close
to 4L/A V-belt profile.  I have read concerns about stiffness and noise
from modern composite belting in certain applications, but when I
removed the old leather and ran the pump with just ONE modern belt on
each position, the pump seemed whisper-quiet -- much quieter than
before, according to the customer, with no slippage.

My options are:

1.  Find original-style replacements.  Not available, and I suspect the
friction/strength/stretch characteristics of this type of belt aren't
the best.

2.  Replace all belts with the grade of composite V-belt I had tried.
When using modern materials, is it necessary to run all six belts?  Or
desirable?  Does overkill merely contribute to noise and friction?  The
original pulleys will be kept.  Which belts would you omit?

3.  Replace some or all with urethane V-belts.  Pros: Quiet and
resilient.  Cons (three): Smallest pulley slightly under recommended
diameter, even for the softer of the two formulas; need to splice myself
or custom order; the one rated for smaller pulleys is orange.

Also, is the wooden idler necessary or desirable when running a material
which has a lower stretch/higher friction than leather?  My "test" belt
was a little smaller than the original, so I tested it with the idler
set clear of the belt, and it grabbed very well.

Any thoughts would be appreciated.

Sincerely,
David V. Anderson, RP
Waukesha, WI


(Message sent Mon 2 May 2005, 18:53:19 GMT, from time zone GMT-0500.)

Key Words in Subject:  Belt, Duo-Art, Pump, Replacement, Steamboat

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