GNAL/scad/spiral/spiral_2.scad

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D=300; // start diameter
N=1; // number of spirals
FN=100;
$fn=FN;
module spiral_facet (i, SPIRAL, START_R = 48, SPACING = 2, FACET_SIZE = 1, FN = 360) {
BOTTOM_T = 1.2;
TOP_T = .3;
H = 2.1;
STEP_SIZE = SPACING / FN;
STEP_OFFSET = (SPIRAL * SPACING) + (i * STEP_SIZE);
ROT = i* (360 / FN);
ANGLE = 0;
OFFSET = START_R + STEP_OFFSET;
rotate([0, 0, ROT]) translate ([OFFSET, 0, - H / 2]) {
rotate ([0, 0, ANGLE]) {
hull () {
translate([(BOTTOM_T - TOP_T) / 2, 0, H])
cube([TOP_T, FACET_SIZE, 0.1], center=true);
cube([BOTTOM_T, FACET_SIZE, 0.1], center=true);
}
//cube([BOTTOM_T, FACET_SIZE, H], center = true);
}
}
}
//https://www.youtube.com/watch?v=lsSeRxpoIaY
//https://www.mathportal.org/calculators/plane-geometry-calculators/right-triangle-calculator.php
module spiral (SPIRALS = 40, START_D = 48) {
SPACING = 2.075;
FACET_SIZE = 1;
for (SPIRAL = [0 : SPIRALS - 1]) {
//C = PI * R^2
C = PI * pow(( (START_D / 2) + (SPIRAL * SPACING) ) / 2, 2);
FN = ceil( (C / FACET_SIZE) * .37 );
for (i = [0 : FN - 1]) {
spiral_facet(i, SPIRAL, START_D / 2, SPACING, FACET_SIZE, FN);
}
}
}
spiral(N, D);