Lowell Gauge...was Down Bearing

[David Skolnik]

Sorry Ed -
I read this after I sent the last post.  I'm just gonna hafta learn to read 
'n type faster. Now I have to respond before I even read them, like this 
one. I can't wait to read it!!

David Skolnik


At 09:33 PM 2/21/2004 -0500, you wrote:
>David writes:
><<  I'd
>much rather watch the video of you leveling the Lowell gauge to the top of
>that thar bridge.  One of those "direct to video" releases, I
>suppose.  Fact is, I can't visualize how the gauge would tell you much of
>anything with that configuration.  Unless I'm mistaken (or
>mis-visualizing), there's no direct relationship between the front string
>termination (the agraffe) and the distal side of the bridge.   Actually, I
>wasn't sure, from your description, what, if any, bridge-segment
>measurement you did take. >>
>
>   If you zero the gauge on the speaking length, and then, with the legs 
> quite
>close together, place the gauge on the string between the front and rear
>bridge pins, it will tell you what the bridge's contribution to the deviation
>between agraffe and hitch pin is.  When I find that the string goes up 
>from the
>proximal bridge pin to the distal one,  I know that the string is relying 
>on the
>proximal bridge pin to hold it to the bridge, which usually gives poor
>termination. I also suspect that the bridge has rolled forward,(toward the 
>V-bar).
>This, I call bad.
>    If the bridge segment lies directly in the same plane as the speaking
>length, and then drops down to the hitch pin, I don't feel the need to 
>correct
>anything.  If the string angles downward as it crosses the bridge, and then
>measures the same angle between bridge and hitch pin as the speaking 
>length, I know
>that there is downward pressure there, whereas simply comparing the speaking
>length to the back string angles might have indicated that there is no
>downbearing.
>   I use the tool to visualize the string as three segments. How they relate
>to each other gives me my picture of downward force or lack thereof in the
>bearing.   I am not saying that everyone will see board loading from this
>perspective, but it has become one of my parameters in making decisions 
>when I change
>the bearing.
>Regards,
>
>Ed Foote RPT
>http://www.uk-piano.org/edfoote/index.html
>www.uk-piano.org/edfoote/well_tempered_piano.html
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives