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Justin Lin
2019-09-24 13:41:32 +08:00
parent d258a062ea
commit 3704abf382
1 changed files with 4 additions and 4 deletions
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105
examples/triangle2square/triangle2square.scad
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@@ -1,105 +0,0 @@
include <line2d.scad>;
include <hollow_out.scad>;
tri_side_leng = 45;
height = 6;
spacing = 0.4;
ring_width = 1.5;
shaft_r = 1;
chain_hole = "YES"; // [YES, NO]
chain_hole_width = 2.5;
// https://www.cs.purdue.edu/homes/gnf/book2/trisqu.html
function triangle_square(tri_side_leng) =
let(
p0 = [0, 0],
p1 = tri_side_leng * [0.25, 0.4330125],
p2 = tri_side_leng * [0.5, 0.8660255],
p4 = tri_side_leng * [1, 0],
p3 = tri_side_leng * [0.75, 0.4330125],
p6 = tri_side_leng * [0.254508, 0],
p5 = tri_side_leng * [0.754508, 0],
p8 = tri_side_leng * [0.5380015, 0.247745],
p7 = tri_side_leng * [0.4665065, 0.1852665],
pieces = [
[p0, p6, p7, p1],
[p6, p5, p8],
[p5, p4, p3, p8],
[p1, p7, p3, p2]
],
hinged_pts = [p5, p3, p1]
)
[pieces, hinged_pts];
module triangle2square(tri_side_leng, height, spacing, ring_width, shaft_r) {
half_tri_side_leng = tri_side_leng / 2;
half_h = height / 2;
joint_ring_inner = shaft_r + spacing;
joint_ring_outer = joint_ring_inner + ring_width;
joint_r_outermost = joint_ring_outer + spacing;
module joint() {
module joint_ring() {
hollow_out(ring_width)
circle(joint_ring_outer);
}
ring_height = height / 3 - spacing;
linear_extrude(ring_height) joint_ring();
translate([0, 0, height - ring_height])
linear_extrude(ring_height) joint_ring();
translate([0, 0, half_h])
linear_extrude(height / 3, center = true)
line2d([0, 0], [joint_r_outermost, 0], shaft_r * 2, p1Style = "CAP_BUTT", p2Style = "CAP_BUTT");
// pillar
linear_extrude(height) circle(shaft_r);
}
offsetd = -spacing / 2;
tri_sq = triangle_square(tri_side_leng);
linear_extrude(height) {
difference() {
offset(offsetd) polygon(tri_sq[0][0]);
translate(tri_sq[1][2]) circle(joint_r_outermost);
}
difference() {
offset(offsetd) polygon(tri_sq[0][1]);
translate(tri_sq[1][0]) circle(joint_ring_inner);
}
difference() {
offset(offsetd) polygon(tri_sq[0][2]);
translate(tri_sq[1][0]) circle(joint_r_outermost);
translate(tri_sq[1][1]) circle(joint_ring_inner);
}
difference() {
offset(offsetd) polygon(tri_sq[0][3]);
translate(tri_sq[1][2]) circle(joint_ring_inner);
translate(tri_sq[1][1]) circle(joint_r_outermost);
}
}
translate(tri_sq[1][0]) rotate(65) joint();
translate(tri_sq[1][1]) rotate(170) joint();
translate(tri_sq[1][2]) rotate(275) joint();
}
$fn = 36;
difference() {
triangle2square(tri_side_leng, height, spacing, ring_width, shaft_r);
if(chain_hole == "YES") {
translate([spacing * 1.5, spacing, height / 2])
linear_extrude(chain_hole_width, center = true)
hollow_out(chain_hole_width)
circle(shaft_r + spacing + chain_hole_width);
}
}