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 2005 > 2005.06.30 > 10Prev  Next


Adjusting Music Roll Spool Friction Brakes
By D. L. Bullock

It does not really matter how many numbers you can read on the tension
of friction brakes.  What the factory did does not matter, either.
It is not the same today after 80 years of playing, or even 80 years
of sitting there not being played.  Also, you certainly do not want the
factory's tension on the paper of an 80-year-old roll.  I can tell you
what I have done with every player I work on and/or rebuild, though.

The felt on the brake should be saturated with oil or grease or you
will have trouble with the brake.  I know, you just pulled off that old
oily felt (or leather), but the new pad must also be greased up or
oiled as well.

The take-up spool test for the correct tension is this:  Set the gears
to reroll and put your hand on the take-up spool and spin it.
Approximate the speed of the rewinding roll.  It is set correctly if
the take-up spool spins about one turn and stops.

To test the lubrication and the correct free working of it, pull the
brake away from the disk and spin it.  This time it will spin several
times, or many times if everything is freed up and working well.  Set
the brake so that it only spins the one time and you will not damage
those old fragile rolls.  Many folks remove this brake completely, and
you can do that, but that can allow the rewind to have trouble if there
is no tension in the brake at all.

The Play brake on the top [supply] spool should also be only tight
enough to keep the paper from chattering as it unrolls.  If you take
the brake off completely, the roll will not be tight against the
tracker bar in many cases and you often can watch it jiggle as it
moves.  Just enough tension to stop this is the correct amount.  Too
tight here can also damage old fragile rolls.

That is my technique.

D.L. Bullock    St. Louis
http://www.pianoworld.us/ 


(Message sent Thu 30 Jun 2005, 04:22:55 GMT, from time zone GMT-0500.)

Key Words in Subject:  Adjusting, Brakes, Friction, Music, Roll, 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 1995-2019 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

. .