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 > February 2014 > 2014.02.22 > 03Prev  Next


Spool Frame Rewind Motor Speed Problem
By Nicholas Simons

Pete,  Regarding your rewind problem, I assume your roll frame is
the one with the 2:1 gearing on the top spool.  Couldn't you simply
exchange the two gears and leave everything else the same?  This would
slow down the rewind but give you four times the torque.  It would
slightly increase the back-torque on play but as long as there is no
current supplied to this motor during play it should be okay.

Good luck,
Nicholas Simons, GB

P.S.: You may, of course, need to make up a suitable sleeve or drill
out one of the gears.  I do not know whether they fit onto equal
diameter shafts.

 [ The inherent bearing friction of the upper gearmotor provides the
 [ hold-back torque on the supply spool during play mode.  Often a
 [ a felt front rail punching is fitted on the motor shaft as a brake,
 [ to provide a bit of torque adjustment.  But an ugly problem arises
 [ when the bronze bushings of the motor shaft bind slightly, which
 [ increases the hold back torque beyond the limited ability of the
 [ drive belts to pull the paper during play.  Installing ball bearings
 [ on the motor shaft solves the problem but adds expense.  -- Robbie


(Message sent Sat 22 Feb 2014, 09:45:59 GMT, from time zone GMT.)

Key Words in Subject:  Frame, Motor, Problem, Rewind, Speed, Spool

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