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add thickness_offset_factor

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Justin Lin
2021-06-02 10:46:21 +08:00
parent 32c407ff0b
commit f356842f9c
1 changed files with 11 additions and 8 deletions
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19
examples/spiral_polygons/spiral_polygon_fidget.scad
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@@ -2,18 +2,21 @@ use <ellipse_extrude.scad>;
use <util/sum.scad>; use <util/sum.scad>;
beginning_radius = 7.5; beginning_radius = 7.5;
fn = 5; fn = 4;
number_of_polygons = 10; number_of_polygons = 2;
height = 30; height = 30;
thickness = 1.5; thickness = 1.5;
thickness_offset_factor = 1.5;
spiral_plate(beginning_radius, fn, number_of_polygons, height); spiral_polygon_fidget(beginning_radius, fn, number_of_polygons, height, thickness, thickness_offset_factor);
module spiral_plate(beginning_radius, fn, n, height) { module spiral_polygon_fidget(beginning_radius, fn, n, height, thickness, thickness_offset_factor) {
theta = 180 / fn; theta = 180 / fn;
thickness_offset = thickness * thickness_offset_factor;
y = beginning_radius - beginning_radius * cos(theta); y = beginning_radius - beginning_radius * cos(theta);
dr = y / cos(theta) + thickness * 1.5; dr = y / cos(theta) + thickness_offset;
pw = pow((beginning_radius + dr) * sin(theta), 2); 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)); function a(ri, ro, i) = acos((pow(ro, 2) + pow(ri, 2) - pw * pow(0.985, i)) / (2 * ro * ri));
@@ -25,7 +28,7 @@ module spiral_plate(beginning_radius, fn, n, height) {
rs = [for(i = [0: n]) beginning_radius + i * dr]; rs = [for(i = [0: n]) beginning_radius + i * dr];
//as = [for(i = [1: n]) a(rs[i - 1], rs[i], i) / 2]; //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]]; s = [for(i = [1: n]) (rs[i] + thickness_offset) / rs[i - 1]];
half_height = height / 2; half_height = height / 2;
@@ -37,7 +40,7 @@ module spiral_plate(beginning_radius, fn, n, height) {
drawPolygon(beginning_radius - thickness); drawPolygon(beginning_radius - thickness);
} }
for(i = [1:n - 1]) { %for(i = [1:n - 1]) {
//rotate(as[i] * 2) //rotate(as[i] * 2)
linear_extrude(half_height, scale = s[i]) linear_extrude(half_height, scale = s[i])
difference() { difference() {