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 > June 2008 > 2008.06.01 > 09Prev  Next


Duo-Art Steamboat Pump Pulley Dimensions
By Jeffrey R. Wood

Quoting the 1925 Duo-Art Service Manual:

  "A one-fourth H. P. motor turning 1150 R. P. M. is
  furnished with the six point pump.  The D. C. motor
  requires a 2-5/8 inch pulley and the A. C. motor
  requires a 2-1/2 inch pulley to develop the 70 or 72
  pulsations required for this type of pump."

It is virtually certain that by 1925, production of the six point
("steamboat") pump had been discontinued.  Oddly, then, the manual
fails to mention that later steamboat pumps were supplied with
identically appearing 1750 RPM motors.  The correct double pulley
diameter for the 1750 RPM motor is 1-3/4", this measurement having
been taken from two original pumps that I have.

It should be noted that the upright motor is mounted with its pulley at
the left; on the grand pump the motor is mounted with its pulley at the
right.  Unlike the later rotary pump, the steamboat pump may be run in
either direction, its main pulley being keyed to the camshaft.  However,
with the motor direction reversible, it is desirable that maximum belt
tension be on the side opposite the idler roller -- yet, with the idler
assembly rigidly mounted instead of being spring-loaded, this doesn't
make an awful lot of difference.  Indeed, my grand pump apparently
always has run "backwards" with respect to the idler.

I recall that one of the screws fastening the idler assembly to the
pump goes into end grain, making its hole easy to strip -- something
that can be corrected when rebuilding.

  "To change rotation of D. C. motors, reverse leads at brushbox."

  "To change rotation of A. C. motors, interchange two leads coming
  through bushing in cover."

-- 1925 Duo-Art Service Manual

Pictures to follow.

Jeffrey R. Wood


(Message sent Sun 1 Jun 2008, 23:25:56 GMT, from time zone GMT-0700.)

Key Words in Subject:  Dimensions, Duo-Art, Pulley, Pump, 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 1995-2024 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