348 lines
12 KiB
OpenSCAD
348 lines
12 KiB
OpenSCAD
links_count=6; // [1..20]
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include_terminal=true; // [true,false]
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export=3; // [0:6]
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MODEL_DEMO=0;
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MODEL_LINKS=1;
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MODEL_CLIP_A=2;
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MODEL_CLIP_B=3;
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MODEL_CLIP_RATCHETING=4;
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MODEL_CLIP_RATCHETING_A=5;
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MODEL_CLIP_RATCHETING_B=6;
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//validation=1;
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VALIDATE_INTERSECTION=1;
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//xray=1;
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use <BOSL/transforms.scad>
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use <BOSL/shapes.scad>
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include <BOSL/constants.scad>
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function is_not_export() = is_undef(export) || export == 0;
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function is_export() = !is_not_export();
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function is_model_strict(m) = is_export() && export == m;
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function is_model(m) = is_not_export() || export == m;
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function get_link_segment_size() = [15, 30, 5];
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function get_link_pin_diameter() = 2;
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function get_link_socket_slack() = [1, 4, 1];
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function get_link_joiner_arm_size() = [get_link_segment_size().x - 2, 3, segment_size.z];
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function get_link_socket_size() = [get_link_segment_size().z,
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get_link_segment_size().y - get_link_joiner_arm_size().y*2,
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get_link_segment_size().z];
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function get_link_clip_size() = [get_link_pin_diameter()*5, get_link_segment_size().y - 5, get_link_segment_size().z];
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echo("===============================");
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echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
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echo("===============================");
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assert(get_link_segment_size().x >= 10, "Link segment is too short.");
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assert(get_link_segment_size().z >= (get_link_pin_diameter() + get_link_socket_slack().z + 1), "Link segment is too thin.");
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module link(terminal=false) {
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segment_size=get_link_segment_size();
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module pin() {
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h=segment_size.y;
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d=get_link_pin_diameter();
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back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
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}
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module pin_socket_area() {
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h=segment_size.y-get_link_socket_slack().y;
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d=segment_size.z;
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back(h/2) xrot(90) cylinder(h=h, d=d, $fn=$preview ? 10 : 30);
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}
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module pin_socket() {
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difference() {
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pin_socket_area();
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scaleup = [
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((get_link_pin_diameter() + get_link_socket_slack().x) / get_link_pin_diameter()),
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((get_link_pin_diameter() + get_link_socket_slack().y) / get_link_pin_diameter()),
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((get_link_pin_diameter() + get_link_socket_slack().z) / get_link_pin_diameter())
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];
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scale(scaleup) pin();
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}
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}
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module joiner() {
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gap=2;
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arm_size=get_link_joiner_arm_size();
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module arm() {
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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);
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}
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module armFront() {
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arm();
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}
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module armBack() {
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scale([1, -1, 1]) arm();
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}
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module armJoiner() {
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joiner_size=[arm_size.x-get_link_socket_size().x, segment_size.y, segment_size.z];
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right(joiner_size.x/2 + get_link_socket_size().x/2 + gap) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
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}
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module socketJoiner() {
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joiner_size=[segment_size.x-get_link_socket_size().x+get_link_socket_size().x*0.2,
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segment_size.y-4,
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segment_size.z];
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difference() {
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right(joiner_size.x/2 + 4.5) cuboid(joiner_size, fillet=1, edges=EDGES_Z_ALL + EDGES_BOTTOM);
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right(segment_size.x) scale([1, 2, 1]) pin_socket_area();
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}
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}
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module terminalArm() {
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left(5) {
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shift=arm_size.x - get_link_pin_diameter();
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right(segment_size.x + shift + gap/2) pin();
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right(segment_size.x + gap/2) {
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armFront();
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armBack();
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}
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right(arm_size.x - get_link_socket_size().x + gap) armJoiner();
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}
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}
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armFront();
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armBack();
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armJoiner();
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if (terminal) {
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terminalArm();
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} else {
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socketJoiner();
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}
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}
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pin();
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joiner();
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if (!terminal) {
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right(segment_size.x) pin_socket();
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}
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}
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module clip() {
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socket_size=get_link_socket_size();
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clip_size=get_link_clip_size();
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pin_diam=get_link_pin_diameter();
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slot_slack=get_link_socket_slack();
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size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
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slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
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entry_size=[slot_size.x, clip_size.y+1, clip_size.z];
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entry_pos=[0, 0, 1.5];
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module socket_area() {
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$fn=$preview? 10 : 20;
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xrot(90) down(size.y/2) cylinder(d=size.z, h=size.y);
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}
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module socket_cutout() {
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$fn=$preview? 10 : 20;
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xrot(90) down(slot_size.y/2) cylinder(d=slot_size.z, h=slot_size.y);
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}
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module cover() {
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translate(entry_pos) cube(entry_size, center=true);
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}
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module joiner(groove) {
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slack=groove?0.5:0;
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joiner_size=[entry_size.x-6+slack, entry_size.y-6+slack, entry_size.z-4+slack];
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joiner_pos=[entry_pos.x, entry_pos.y, entry_pos.z - entry_size.z/2];
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translate(joiner_pos) cube(joiner_size, center=true);
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}
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module model() {
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difference() {
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union() {
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right(clip_size.x/2) socket_area();
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left(clip_size.x/2) socket_area();
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cube(clip_size, center=true);
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}
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right(clip_size.x/2) socket_cutout();
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left(clip_size.x/2) socket_cutout();
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}
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}
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right(clip_size.x/2)
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if (is_model(MODEL_CLIP_A)) {
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difference() {
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model();
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cover();
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}
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joiner(groove=false);
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} else if (is_model(MODEL_CLIP_B)) {
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difference() {
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intersection() {
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model();
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cover();
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}
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joiner(groove=true);
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}
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}
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}
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module clip_ratcheting(ratchet_length=30) {
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socket_size=get_link_socket_size();
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clip_size=get_link_clip_size();
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pin_diam=get_link_pin_diameter();
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slot_slack=get_link_socket_slack();
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size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
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slot_size=[clip_size.x+slot_slack.x + 0.2, size.y+1, pin_diam+slot_slack.z];
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entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
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//right(clip_size.x/2)
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module hook() {
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intersection() {
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difference() {
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cuboid(size, fillet=1);
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cuboid(slot_size, fillet=1);
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up(entry_size.z/2) cube(entry_size, center=true);
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}
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translate([0, -50, -50]) cube([100, 100, 100]);
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}
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}
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module hookRight() {
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hook();
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}
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module hookLeft() {
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scale([-1, 1, 1]) hook();
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}
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wall=2;
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tooth_size=[4, 3, 3];
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module tooth() {
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s=[tooth_size.x, tooth_size.z, tooth_size.y];
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up(tooth_size.z/2) xrot(-90) right_triangle(s);
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}
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module teethFwd() {
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tooth_count = ratchet_length/tooth_size.x;
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fwd((clip_size.y-wall*2)/2)
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right(ratchet_length/2) {
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for (i=[1:tooth_count]) {
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left(i*tooth_size.x) tooth();
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}
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cap_size=[ratchet_length, tooth_size.y, 1];
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up(tooth_size.z/2 + cap_size.z/2) left(cap_size.x/2) back(tooth_size.y/2) {
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difference() {
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cube(cap_size, center=true);
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translate([0.1, 0.1, 0]) back(tooth_size.y/2) right(ratchet_length/2) zrot(180) tooth();
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}
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}
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}
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}
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module teethBack() {
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scale([1, -1, 1]) teethFwd();
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}
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module ratchetLeft() {
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right(ratchet_length/2) {
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difference() {
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cube([ratchet_length, clip_size.y, clip_size.z], center=true);
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up(wall/2) cube([ratchet_length, clip_size.y-wall*2, clip_size.z], center=true);
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right(ratchet_length/2+1) {
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slideRailGuide(groove=true);
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scale([1,-1,1]) slideRailGuide(groove=true);
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}
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}
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teethFwd();
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teethBack();
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}
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}
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ratchet_tooth_count=2;
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ratchet_wall=2.5;
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ratchet_slack=0.3;
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rail_slack=0.2;
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ratchet_tooth_scale_z=0.8;
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module ratchetTeethFront() {
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module ratchetButton() {
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size=[8,wall*4,4];
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up(size.z+1) fwd(wall*2 - ratchet_wall) cuboid(size, fillet=1, edges=EDGES_FRONT);
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up(2) back(ratchet_wall/2) cube([size.x, ratchet_wall, tooth_size.z*ratchet_tooth_scale_z + size.z], center=true);
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}
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fwd((clip_size.y-wall*2)/2 - tooth_size.y - ratchet_slack)
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left(ratchet_length) {
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for (i=[0:ratchet_tooth_count-1]) {
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right(i*tooth_size.x) scale([-1,-1*(1-i/5),ratchet_tooth_scale_z]) tooth();
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}
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ratchetButton();
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}
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module ratchetWall() {
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up(tooth_size.z/2) left(ratchet_length/2 + wall - wall/2) fwd(clip_size.y/2-wall-tooth_size.y-ratchet_wall/2 - ratchet_slack)
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down(wall/2+0.5) cube([ratchet_length + wall, ratchet_wall, tooth_size.z*ratchet_tooth_scale_z], center=true);
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}
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ratchetWall();
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}
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module ratchetTeethBack() {
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scale([1,-1,1]) ratchetTeethFront();
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}
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module ratchetRight() {
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left(wall) cube([wall*2, clip_size.y + rail_slack*2, clip_size.z], center=true);
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ratchetTeethFront();
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ratchetTeethBack();
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}
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module slideRailGuide(groove) {
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size=[ratchet_length, wall, wall];
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fwd(clip_size.y/2 + rail_slack)
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left(size.x/2) scale(groove?1.5:1) cuboid(size, fillet=0.5);
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}
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module slideRailLeft() {
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size=[ratchet_length, clip_size.y/2 - ratchet_wall*2 - wall/2 - ratchet_slack - tooth_size.y, clip_size.z];
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right(size.x/2) cube(size, center=true);
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}
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module slideRailRight() {
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size=[ratchet_length + 3, wall*1.5, clip_size.z];
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module railFront() {
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fwd(clip_size.y/2 + size.y/2 + rail_slack) left(size.x/2)
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cuboid(size, fillet=1, edges=EDGES_FRONT);
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slideRailGuide(groove=false);
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}
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module railBack() {
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scale([1, -1, 1]) railFront();
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}
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railFront();
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railBack();
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}
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if (is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING)) {
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left(ratchet_length + wall + 1) {
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hookLeft();
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left(0.1) {
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ratchetLeft();
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slideRailLeft();
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}
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}
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}
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if (is_model(MODEL_CLIP_RATCHETING_B) || is_model(MODEL_CLIP_RATCHETING)) {
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ratchetRight();
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hookRight();
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slideRailRight();
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}
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}
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// Export / Demo / Validation:
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segment_size=get_link_segment_size();
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if (!is_undef(validation)) {
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if (validation==VALIDATE_INTERSECTION) {
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intersection() {
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right(0*segment_size.x) link();
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right(1*segment_size.x) link();
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}
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intersection() {
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right(1*segment_size.x) link();
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right(2*segment_size.x) link();
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}
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}
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} else {
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intersection () {
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if (!is_undef(xray)) {
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down(50) cube([100, 100, 100], center=true);
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}
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union() {
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if (is_model(MODEL_CLIP_A) || is_model(MODEL_CLIP_B)) {
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left(get_link_clip_size().x) clip();
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}
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if (is_model(MODEL_CLIP_RATCHETING) || is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING_B)) {
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left(get_link_clip_size().x) clip_ratcheting();
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}
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if (is_model(MODEL_LINKS)) for (i = [0:links_count-1]) {
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terminal=(i==links_count-1) && include_terminal;
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right(i*segment_size.x) link(terminal=terminal);
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}
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}
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}
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}
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