[pianotech] Method for cutting balance rail bearings

[ed440 at mindspring.com]

David-

For accuracy, why not make a strip of wood or plastic with the contour, then drill the strip, then chop the little blocks. Make indexing jigs using a balance rail pin to hold the strip while you drill or cut.

The concept looks very workable. There would probably be a slight change in key height when the blocks were turned.

Ed Sutton

-----Original Message-----
>From: David Love <davidlovepianos at comcast.net>
>Sent: Jan 2, 2012 8:52 PM
>To: pianotech at ptg.org
>Subject: [pianotech] Method for cutting balance rail bearings
>
>Attached is a crude drawing of a balance rail bearing.  I posted this
>question on the new list in response to something but ran into a road block
>trying to get this drawing posted along with it, at least easily.  I've been
>trying to figure out a way to produce this type of cut (the diagonal line
>represents the cut) uniformly on a set of balance rail bearings such that by
>turning them either with the cut facing forward or back you could change the
>action leverage easily and quickly.  Looking for production ideas.  The
>bearing would need to be cut and then probably covered with felt, although I
>suppose you could simply drop an unglued punching right down on top.  
>
>Let me know what you think.
>
>
>David Love