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Useful formulae for Finding
Dimensions of Circles, Squares, etc.
D is diameter of stock necessary to turn shape desired.
E is distance “across flats,” or diameter of inscribed circle.
C is depth of cut into stock turned to correct diameter.
C
E
D
C
E
D
C
E
D
C
E
D
C
E
D
TRIANGLE
E
= side x 0.57735
D
= side x 1.1547 = 2E
Side
= D x 0.866
C
= E x 0.5 = D x 0.25
SQUARE
E
= side = D x 0.7071
D
= side x 1.4142 = diagonal
Side
= D x 0.7071
C
= D x 0.14645
PENTAGON
E
= side x 1.3764 = D x 0.809
D
= side x 0.7013 = E x 1.2361
Side
= D x 0.5878
C
= D x 0.0955
HEXAGON
E
= side x 1.7321 = D x 0.866
D
= side x 2 = E x 1.1547
Side
= D x 0.5
C
= D x 0.067
OCTAGON
E
= side x 2.4142 = D x 0.9239
D
= side x 2.6131 = E x 1.0824
Side
= D x 0.3827
C
= D x 0.038
