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add spiral_polygon_fidget

This commit is contained in:
Justin Lin
2021-06-01 06:43:33 +08:00
parent 047f82a9a3
commit 9f4ede7e29

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use <ellipse_extrude.scad>;
use <util/sum.scad>;
beginning_radius = 7.5;
fn = 5;
number_of_polygons = 10;
height = 30;
thickness = 1.5;
spiral_plate(beginning_radius, fn, number_of_polygons, height);
module spiral_plate(beginning_radius, fn, n, height) {
theta = 180 / fn;
y = beginning_radius - beginning_radius * cos(theta);
dr = y / cos(theta) + thickness * 1.5;
pw = pow((beginning_radius + dr) * sin(theta), 2);
function a(ri, ro, i) = acos((pow(ro, 2) + pow(ri, 2) - pw * pow(0.985, i)) / (2 * ro * ri));
module drawPolygon(r) {
circle(r, $fn = fn);
}
rs = [for(i = [0: n]) beginning_radius + i * dr];
//as = [for(i = [1: n]) a(rs[i - 1], rs[i], i) / 2];
s = [for(i = [1: n]) (rs[i] * 1.2) / rs[i - 1]];
half_height = height / 2;
module half() {
translate([0, 0, -half_height]) {
linear_extrude(half_height, scale = s[0])
difference() {
drawPolygon(beginning_radius);
drawPolygon(beginning_radius - thickness);
}
for(i = [1:n - 1]) {
//rotate(as[i] * 2)
linear_extrude(half_height, scale = s[i])
difference() {
drawPolygon(rs[i]);
drawPolygon(rs[i] - thickness);
}
}
}
}
half();
mirror([0, 0, 1])
half();
}