Modified 12/2020
Page TTT_30
..Construction Details of Tap Tone Wood Reference Tool....
..This is the side profile of the vertical bar glued on the sounding board:
22 3/16" long X 0.225" wide (5 mm)
0.30" high
this end.
0.60" high
this end.
0.510" high
here
0.420" high
here
3"
20"
0.225" wide
Approximate expected depth of vertical bar at different frequencies: ( Bar with straight sides.) :
..Your tool will be slightly different... just tune to calibration reference sound file on previous page.
..This is my current favorite 'tapper" tool :
..6 " long and 0.3" by 0.4" cross section, made of split spruce wood with 213 wood tone and # 22 rub tone.
..This is my new favorite 'tapper" tool : {2020 Material : ...} [Really reduces the unwanted high overtones...]
..6 " long and 0.3" by 0.4" cross section, made of split spruce wood with "213" wood tone and # 22 rub tone. (As before, but now split it with a thin metal wedge in the center line; in line with the tree growth rings, into two equal halves.)
..Longitudinal Cross-Section as seem from the side..
..Cross Section in the middle...
..Now that it is split apart, dig out the wood in a mortise shape leaving enough wood on the edges for gluing back together after the hollowed out areas of the two halves are filled most of the way with lead 'bird shot' (fine lead pellets from sporting shops). Leave a little room so the lead shot has some room to move when assembled.
..Now mix up your violin making hide glue and wet all the joint areas and tip the two halves together quickly and clamp in place until dry.
..This "Dead Tapper" will eliminate much of the high overtones which really helps us hear the lowest overtone, which is what we are listening and adjusting our violin parts from.
..HIGHLY recommended for tap tone tuning!
Use these for above pattern:
.162 HZ ( 0.389 /0.447")
176 HZ (0.414/ 0.488")
198 HZ (0.453/ 0.576")
213 HZ (0.467"
242 HZ (0.507"
287 HZ (0.532"
324 HZ (0.560"
396 HZ (0.577"
To modify tool to cover 600HZ add :
400 HZ (0.604"
450 HZ (0.640"
500 HZ (0.655"
550 HZ (0.679"
600 HZ (0.700"