Correcting Uneven Areas.......
(10/2020)
page AA_59
...By David Langsather, Violin Acoustical Researcher www.violinresearch.com info@violinresearch.com
These are the three tap tone goal tap references you can use in tuning these parts: [Click to hear frequency]:
..Lets say the indicated area is too low in tap tone, in the area shown...
..First draw lines from acoustical center to the sides of adjustment area.
..Now in the triangle formed, and in approximately in the relatively same area (shown in green), look for the local tap tone to be higher than goal frequency.
..Scrape or sand (being careful to stay in borders of blue triangle, until the tap tone drops to the target frequency.
.Now check read outlined area to be sure it has raised to correct frequency.
..Now let us evaluate the two side triangles formed as shown. Tap from the acoustical center outward in straight lines and note any areas too high or too low.
..Scrape down any too high areas and for any areas that remain too low : scrape the area near the acoustical center, and in line with the too low area, until the low tap tone area is raised to goal frquency.
..In this example, the two indicated areas In green) are too low in tap tone:
..Probable solution is also drawn in orange, with blue triangles from acoustical center as guide lines (do not go past the guide lines.). ....
..Saved for future illustrations.....
..For future description. ....
..Lets say that a larger section of one end is too high:
Then scrape that area down until there is the correct tap tone evenly.
..If a larger section of one of the end areas is too low (hatched in area above);
To correct, scrape in the direction of low area beginning at acoustical center and moving up to the mode # 5 line. This will raise the tap tone for you in the end area. ....
..The following instructions applies equally to violin plates, violin fingerboards, and violin tailpieces :
Mode # 5 Nodal lines...
..Saved for future illustrations.....
..For future description. ....
..Saved for future illustrations.....
..For future description. ....
