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- links_count=3; // [1..20]
- include_terminal=true; // [true,false]
-
- include <export.scad>
- use <BOSL/transforms.scad>
- use <BOSL/shapes.scad>
- include <BOSL/constants.scad>
-
- use <strap_common.scad>
-
- if (is_model_strict(MODEL_LINKS)) {
- 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(terminal=false) {
- $fn=$preview?4:20;
- module link_joiner() {
- gap=get_link_socket_roundgap();
- segment_size=get_link_segment_size();
- arm_size=get_link_joiner_arm_size();
-
- module pin_to_socket_joiner() {
- joiner_size=[segment_size.x-get_link_socket_size().x+get_link_socket_size().x*0.2,
- 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();
- }
- }
-
- pin_to_socket_joiner();
- }
-
- link_connector_pin();
- if (terminal) {
- right(get_link_segment_size().x + 2) zrot(180) link_connector_pin();
- } else {
- link_joiner();
- right(get_link_segment_size().x) link_connector_socket();
- }
- }
-
- module link_chain(links_count, include_terminal=true) {
- for (i = [0:links_count-1]) {
- terminal=(i==links_count-1) && include_terminal;
- right(i*get_link_segment_size().x) link(terminal=terminal);
- }
- }
-
- module clip() {
- $fn=$preview?4:20;
- socket_size=get_link_socket_size();
- clip_size=get_link_clip_size();
- pin_diam=get_link_pin_diameter();
- slot_slack=get_link_socket_slack();
- size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
- slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
- entry_size=[slot_size.x, clip_size.y+1, clip_size.z];
- entry_pos=[0, 0, 1.5];
-
- module socket_area() {
- $fn=$preview? 10 : 20;
- xrot(90) down(size.y/2) cylinder(d=size.z, h=size.y);
- }
- module socket_cutout() {
- $fn=$preview? 10 : 20;
- xrot(90) down(slot_size.y/2) cylinder(d=slot_size.z, h=slot_size.y);
- }
- module cover() {
- translate(entry_pos) cube(entry_size, center=true);
- }
- module joiner(groove) {
- slack=groove?0.2:0;
- joiner_size=[entry_size.x-6+slack, entry_size.y-6+slack, entry_size.z-3+slack];
- joiner_pos=[entry_pos.x, entry_pos.y, entry_pos.z - entry_size.z/2 + joiner_size.z/2];
- translate(joiner_pos) cube(joiner_size, center=true);
- }
-
- module model() {
- difference() {
- union() {
- right(clip_size.x/2) socket_area();
- left(clip_size.x/2) socket_area();
- cube(clip_size, center=true);
- }
- right(clip_size.x/2) socket_cutout();
- left(clip_size.x/2) socket_cutout();
- }
- }
-
- left(socket_size.x/2)
- {
- if (is_model(MODEL_CLIP_A)) {
- difference() {
- model();
- cover();
- }
- joiner(groove=false);
- }
- if (is_model(MODEL_CLIP_B)) {
- difference() {
- intersection() {
- model();
- cover();
- }
- joiner(groove=true);
- }
- }
- }
- }
-
- module clip_ratcheting(ratchet_length=28) {
- $fn=$preview?4:20;
- socket_size=get_link_socket_size();
- clip_size=get_link_clip_size();
- pin_diam=get_link_pin_diameter();
- slot_slack=get_link_socket_slack();
- size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
- slot_size=[clip_size.x+slot_slack.x + 0.2, size.y+1, pin_diam+slot_slack.z];
- entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
- connector_size=[25, 0, 0];
- module hookRight() {
- right(connector_size.x/2) zrot(180) link_connector_pin();
- }
- module hookLeft() {
- left(connector_size.x/2) link_connector_pin();
- }
- wall=2;
- tooth_size=[4, 3, 3];
- module tooth() {
- s=[tooth_size.x, tooth_size.z, tooth_size.y];
- up(tooth_size.z/2) xrot(-90) right_triangle(s);
- }
- module teethFwd() {
- tooth_count = ratchet_length/tooth_size.x;
- fwd((clip_size.y-wall*2)/2)
- right(ratchet_length/2) {
- for (i=[1:tooth_count]) {
- left(i*tooth_size.x) tooth();
- }
- cap_size=[ratchet_length, tooth_size.y, 1];
- up(tooth_size.z/2 + cap_size.z/2) left(cap_size.x/2) back(tooth_size.y/2) {
- difference() {
- cube(cap_size, center=true);
- translate([0.1, 0.1, 0]) back(tooth_size.y/2) right(ratchet_length/2) zrot(180) tooth();
- }
- }
- }
- }
- module teethBack() {
- scale([1, -1, 1]) teethFwd();
- }
- module ratchetLeft() {
- right(ratchet_length/2) {
- difference() {
- cube([ratchet_length, clip_size.y, clip_size.z], center=true);
- up(wall/2) cube([ratchet_length, clip_size.y-wall*2, clip_size.z], center=true);
- right(ratchet_length/2+1) {
- slideRailGuide(groove=true);
- scale([1,-1,1]) slideRailGuide(groove=true);
- }
- }
- teethFwd();
- teethBack();
- }
- }
- ratchet_tooth_count=2;
- ratchet_wall=2.5;
- ratchet_slack=0.3;
- rail_slack=0.2;
- ratchet_tooth_scale_z=0.8;
- module ratchetTeethFront() {
- module ratchetButton() {
- size=[8,wall*4,4];
- up(size.z+1) fwd(wall*2 - ratchet_wall) cuboid(size, fillet=1, edges=EDGES_FRONT);
- up(2) back(ratchet_wall/2) cube([size.x, ratchet_wall, tooth_size.z*ratchet_tooth_scale_z + size.z], center=true);
- }
- fwd((clip_size.y-wall*2)/2 - tooth_size.y - ratchet_slack)
- left(ratchet_length) {
- for (i=[0:ratchet_tooth_count-1]) {
- right(i*tooth_size.x) scale([-1,-1*(1-i/5),ratchet_tooth_scale_z]) tooth();
- }
- ratchetButton();
- }
-
- module ratchetWall() {
- 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)
- down(wall/2+0.5) cube([ratchet_length + wall, ratchet_wall, tooth_size.z*ratchet_tooth_scale_z], center=true);
- }
- ratchetWall();
- }
- module ratchetTeethBack() {
- scale([1,-1,1]) ratchetTeethFront();
- }
- module ratchetRight() {
- left(wall) cube([wall*2, clip_size.y + rail_slack*2, clip_size.z], center=true);
-
- ratchetTeethFront();
- ratchetTeethBack();
- }
- module slideRailGuide(groove) {
- size=[ratchet_length, wall, wall];
- fwd(clip_size.y/2 + rail_slack)
- left(size.x/2) scale(groove?1.5:1) cuboid(size, fillet=0.5);
- }
- module slideRailLeft() {
- size=[ratchet_length, clip_size.y/2 - ratchet_wall*2 - wall/2 - ratchet_slack - tooth_size.y, clip_size.z];
- right(size.x/2) cube(size, center=true);
- }
- module slideRailRight() {
- size=[ratchet_length + 3, wall*1.5, clip_size.z];
- module railFront() {
- fwd(clip_size.y/2 + size.y/2 + rail_slack) left(size.x/2)
- cuboid(size, fillet=1, edges=EDGES_FRONT);
- slideRailGuide(groove=false);
- }
- module railBack() {
- scale([1, -1, 1]) railFront();
- }
- railFront();
- railBack();
- }
-
- right(size.x + connector_size.x - 2) {
- left(2)
- if (is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING)) {
- left(ratchet_length + wall + 1) {
- hookLeft();
- left(0.1) {
- ratchetLeft();
- slideRailLeft();
- }
- }
- }
- right(is_model(MODEL_DEMO) ? ratchet_length + 5 : 0)
- if (is_model(MODEL_CLIP_RATCHETING_B) || is_model(MODEL_CLIP_RATCHETING)) {
- ratchetRight();
- hookRight();
- slideRailRight();
- }
- }
- }
-
- // === Export ===
- if (is_model(MODEL_DEMO)) {
- translate([-20, -40, -10]) zrot(-90) {
- link_chain(links_count, include_terminal=include_terminal);
- right(links_count * get_link_segment_size().x + get_link_clip_size().x) {
- clip();
- right(get_link_clip_size().x) clip_ratcheting();
- }
- }
- } else {
- if (is_model(MODEL_CLIP_A) || is_model(MODEL_CLIP_B)) {
- left(get_link_clip_size().x) clip();
- }
- if (is_model(MODEL_CLIP_RATCHETING) || is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING_B)) {
- left(get_link_clip_size().x * 2 + 3) clip_ratcheting();
- }
- if (is_model(MODEL_LINKS)) for (i = [0:links_count-1]) {
- terminal=(i==links_count-1) && include_terminal;
- right(i*get_link_segment_size().x) link(terminal=terminal);
- }
- }
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