Step by step 2D drawings 7-10

The (2D) geometric development step by step

Step 7
Location of corners and smallest width
The corners of the outline are positioned on the circular arc (K) wHich is drawn from the centre of the original square through the point of intersection (L) of base-line and cord-line.
The smallest width appear between the circular arcs of the rotated base lines (J)

Step 8
Fingerboard dimension
The size and proportion of the fingerboard relates as:
O:M=P:N
when 2xM=650 Than M=325.
If O=24 and the length of the fingerboard 269 mm
Then P=43.86

Step 9
F-hole size and location
The position of the F-holes are decided by the Lengths (R) of the side of the equilateral triangle deciding the size of the radius of the base line and its position after the rotation completed rotation
The length (Q) is almost 72 mm

Step 10
Bass bar location
The irrational direction of the bass-bar is defined by a line (S) from the point of intersection of the cords on the longitudinal axis and the tangent point on the upper F-hole edge

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	Step 7 Location of corners and smallest width The corners of the outline are positioned on the circular arc (K) wHich is drawn from the centre of the original square through the point of intersection (L) of base-line and cord-line. The smallest width appear between the circular arcs of the rotated base lines (J)
	Step 8 Fingerboard dimension The size and proportion of the fingerboard relates as: O:M=P:N when 2xM=650 Than M=325. If O=24 and the length of the fingerboard 269 mm Then P=43.86
	Step 9 F-hole size and location The position of the F-holes are decided by the Lengths (R) of the side of the equilateral triangle deciding the size of the radius of the base line and its position after the rotation completed rotation The length (Q) is almost 72 mm
	Step 10 Bass bar location The irrational direction of the bass-bar is defined by a line (S) from the point of intersection of the cords on the longitudinal axis and the tangent point on the upper F-hole edge