[CAUT] Downbearing Error

Richard Brekne ricb at pianostemmer.no
Mon Nov 19 16:17:10 MST 2007


    Did you maybe over compensate for board deflection in designing the
    dimension of the bridge?

    Best,
    Greg

Forgot to answer this question.  I had thought I had rather under 
compensated for board deflection actually.  I had the board clamped in 
place, the bridge screwed tight and the plate screwed down. I went back 
and forth with measurements and was dead sure I had about 1.5 degrees in 
the high treble and 0 in  the low tenor... 0 in all the bass.  I ended 
up with about 3.2 degrees in the treble and 1.5 degrees in the bass 
after loading the glued in place board and bridge. 

Cant for the life of me figure how I got so far off.  But whatever I did 
was pretty uniform.

Sigh... live and learn.  I'll get it right in the end one way or the 
other.  In the mean time is sound quite nicely as is actually.  We are 
going to play a short program on it next week and then I'll get it back 
into the shop to do this over one way or the other.  There goes my Xmas 
vacation :)

All this said... gotta say it.  I'm having a ball learning about how to 
do this.  Slow steps to be sure... but steps non the less.

Cheers
RicB


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