Bass String Length Equality

[Farrell]

Bridge redone. Bicord lengths exactly equal. With first version bass bridge left string of each unison was 4 mm longer than the right. Now they are the same. Thanks for the input Ron. Some very funky triangular notching required for this arrangement (unless of course I did it a stupid way again!). Two pictures available.

Terry Farrell
  
----- Original Message ----- 
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, May 19, 2003 10:17 AM
Subject: Re: Bass String Length Equality


> 
> >I am redoing an upright. I have notched the new bass bridge in the bicord 
> >area. However, the pinned-cast-iron upper termination is in a horizontal 
> >line, whereas the strings are at a fair angle - hence, the left string of 
> >each bicord is a few millimeters longer than the right string. I should 
> >think it fair to assume then that redoing this upper termination to 
> >produce equal string lengths would be of some benefit.
> 
> Didn't you make the notches parallel to the top bridge, or did you notch 
> perpendicular to the strings? If the top bridge is wood, I'd make a new one 
> to accommodate the notches in the lower bridge.
> 
> If I was just replacing a bass bridge on a vertical piano without any other 
> extensive work, I'd just bevel it like it was originally.
> 
> >My question is: would the benefit/difference be audible - would it make 
> >for a better piano to the discriminating ear?
> 
> With the deviation as a percentage of overall length, and with the erratic 
> nature of wrapped strings, it's doubtful. Still, if this happens to be the 
> M&H you're putting all that redesign work into, it should be as clean as 
> you can make it.
> 
> 
> >I should think the difference would be much the same as on a grand that 
> >has agraffes in the bass and the bicord area of the bass bridge is at a 
> >fair angle to the strings and is upgraded from a continuous single bevel 
> >to proper notching. Does this upgrade on the small grand result in an 
> >audible improvement?
> >
> >Terry Farrell
> 
> If the agraffe is already parallel to the bevel, notching and repositioning 
> the agraffe so they will both be perpendicular to the string won't make any 
> real difference.
> 
> Ron N
> 
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