PinePhoneBoy/strap_link.scad
2021-01-17 16:49:08 +01:00

107 lines
3.2 KiB
OpenSCAD

links_count=15;
//validation=1;
VALIDATE_INTERSECTION=1;
//xray=1;
use <BOSL/transforms.scad>
use <BOSL/shapes.scad>
include <BOSL/constants.scad>
function get_link_segment_size() = [15, 30, 5];
function get_link_pin_diameter() = 2;
function get_link_socket_slack() = [1, 4, 1];
echo("===============================");
echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
echo("===============================");
assert(get_link_segment_size().x >= 10, "Link segment is too short.");
assert(get_link_segment_size().z >= (get_link_pin_diameter() + get_link_socket_slack().z + 1), "Link segment is too thin.");
module link() {
segment_size=get_link_segment_size();
module pin() {
h=segment_size.y;
d=get_link_pin_diameter();
back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
}
module pin_socket_area() {
h=segment_size.y-get_link_socket_slack().y;
d=segment_size.z;
back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
}
module pin_socket() {
difference() {
pin_socket_area();
scaleup = [
((get_link_pin_diameter() + get_link_socket_slack().x) / get_link_pin_diameter()),
((get_link_pin_diameter() + get_link_socket_slack().y) / get_link_pin_diameter()),
((get_link_pin_diameter() + get_link_socket_slack().z) / get_link_pin_diameter())
];
scale(scaleup) pin();
}
}
module joiner() {
gap=2;
arm_size=[8, 3, segment_size.z];
module arm() {
fwd(segment_size.y/2 + arm_size.y/2 - 1) right(arm_size.x/2 - 1) cuboid(arm_size, fillet=1, edges=EDGES_FRONT + EDGES_Y_ALL);
}
module armFront() {
arm();
}
module armBack() {
scale([1, -1, 1]) arm();
}
module armJoiner() {
joiner_size=[arm_size.x*0.48, segment_size.y, segment_size.z];
right(joiner_size.x + 1) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
}
module socketJoiner() {
joiner_size=[segment_size.x-4,
segment_size.y-4,
segment_size.z];
difference() {
right(joiner_size.x/2 + 4.5) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
right(segment_size.x) scale([1, 2, 1]) pin_socket_area();
}
}
socketJoiner();
armFront();
armBack();
armJoiner();
}
pin();
right(segment_size.x) pin_socket();
joiner();
}
segment_size=get_link_segment_size();
if (!is_undef(validation)) {
if (validation==VALIDATE_INTERSECTION) {
intersection() {
right(0*segment_size.x) link();
right(1*segment_size.x) link();
}
intersection() {
right(1*segment_size.x) link();
right(2*segment_size.x) link();
}
}
} else if (!is_undef(xray)) {
intersection() {
cube([1000, 1000, 1000]);
for (i = [0:links_count-1]) {
right(i*segment_size.x) link();
}
}
} else {
for (i = [0:links_count-1]) {
right(i*segment_size.x) link();
}
}