Making the Violin Geometric Arching Shape and （使几何拱形形状和小提琴）.pdfVIP

1 Making the Violin Geometric Arching Shape and A Method of Thickness Graduating Plates By Robert Zuger Mejerigatan 16 SE26734 Bjuv Sweden Email: zuger.robert@ INTRODUCTION In an earlier report on “The impact of arching on structural deflection” the quality and consequences of specific arching when string load is applied are described. Read www.zuger.se under the header design quality. In order to achieve this specific quality the practical work must be done very precisely. The basis for this work is the geometric structure of arching and the “Partial Stabilizing Framework” (PSF) that arise when the sound post is squeezed between the belly and back. This PSF basically has the shape of an octahedron. The corner lines of the octahedron are structural shape on the arch of the belly and back and named Straight Tangent Line (STL). These extended STLs make the perfect octahedron shape. This report describes how to accomplish and how to make the geometric arching with the use of templates known as “the six”. This report explains how to make these templates, which are the necessary tools we need to control the specific arching. 1. How to construct the cross sectional shapes All perpendicular cross arcs along the length axis have a radius shape (convex shape). The scoop shape outside these arcs has a varying concave shape. Later on in this report there will be a description of how the scoop may look. In order to be able