mirror of
https://github.com/nophead/NopSCADlib.git
synced 2025-03-14 19:59:45 +01:00
Merge branch 'drag_chain_no_support_v2' of https://github.com/martinbudden/NopSCADlib into martinbudden-drag_chain_no_support_v2
This commit is contained in:
Chris Palmer
commit
72700a0acb
@ -35,18 +35,17 @@ include <../core.scad>
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use <../utils/horiholes.scad>
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use <../utils/maths.scad>
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clearance = 0.1;
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function drag_chain_name(type) = type[0]; //! The name to allow more than one in a project
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function drag_chain_size(type) = type[1]; //! The internal size and link length
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function drag_chain_travel(type) = type[2]; //! X travel
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function drag_chain_wall(type) = type[3]; //! Side wall thickness
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function drag_chain_bwall(type) = type[4]; //! Bottom wall
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function drag_chain_twall(type) = type[5]; //! Top wall
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function drag_chain_screw(type) = type[6]; //! Mounting screw for the ends
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function drag_chain_screw_lists(type) = type[7]; //! Two lists of four bools to say which screws positions are used
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function drag_chain_clearance(type) = type[6]; //! Clearance around joints
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function drag_chain_supports(type) = type[7]; //! Whether to print version of chain with or without supports
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function drag_chain_screw(type) = type[8]; //! Mounting screw for the ends
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function drag_chain_screw_lists(type) = type[9]; //! Two lists of four bools to say which screws positions are used
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function drag_chain_clearance() = clearance; //! Clearance around joints.
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function drag_chain_radius(type) = //! The bend radius at the pivot centres
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let(s = drag_chain_size(type))
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@ -56,12 +55,12 @@ function drag_chain_z(type) = //! Outside dimension of a 180 bend
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let(os = drag_chain_outer_size(type), s = drag_chain_size(type))
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2 * drag_chain_radius(type) + os.z;
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function drag_chain(name, size, travel, wall = 1.6, bwall = 1.5, twall = 1.5, screw = M2_cap_screw, screw_lists = [[1,0,0,1],[1,0,0,1]]) = //! Constructor
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[name, size, travel, wall, bwall, twall, screw, screw_lists];
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function drag_chain(name, size, travel, wall = 1.6, bwall = 1.5, twall = 1.5, clearance = 0.1, supports = true, screw = M2_cap_screw, screw_lists = [[1,0,0,1],[1,0,0,1]]) = //! Constructor
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[name, size, travel, wall, bwall, twall, clearance, supports, screw, screw_lists];
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function drag_chain_outer_size(type) = //! Link outer dimensions
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let(s = drag_chain_size(type), z = s.z + drag_chain_bwall(type) + drag_chain_twall(type))
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[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * clearance, z];
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[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * drag_chain_clearance(type), z];
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function screw_lug_radius(screw) = //! Radius of a screw lug
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corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width;
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@ -85,6 +84,7 @@ module drag_chain_screw_positions(type, end) { //! Place children at the screw p
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r = screw_lug_radius(drag_chain_screw(type));
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s = drag_chain_size(type);
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os = drag_chain_outer_size(type);
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clearance = drag_chain_clearance(type);
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R = os.z / 2;
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x0 = end ? R + norm([drag_chain_cam_x(type), R - drag_chain_twall(type)]) + clearance + r : r;
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x1 = end ? os.x - r : os.x - 2 * R - clearance - r;
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@ -99,7 +99,7 @@ function drag_chain_cam_x(type) = // how far the cam sticks out
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let(s = drag_chain_size(type),
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r = drag_chain_outer_size(type).z / 2,
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wall = drag_chain_wall(type),
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cam_r = s.x - 2 * clearance - wall - r, // inner_x_normal - clearance - r
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cam_r = s.x - 2 * drag_chain_clearance(type) - wall - r, // inner_x_normal - clearance - r
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twall = drag_chain_twall(type)
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) min(sqrt(max(sqr(cam_r) - sqr(r - twall), 0)), r);
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@ -111,8 +111,15 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
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bwall = drag_chain_bwall(type);
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twall = drag_chain_twall(type);
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os = drag_chain_outer_size(type);
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clearance = drag_chain_clearance(type);
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supports = drag_chain_supports(type);
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r = os.z / 2;
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pin_r = r / 2;
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// initial estimates of pin_r and pin_h
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pin_r0 = r / 2 - 0.2;
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pin_h0 = min(wall + clearance, 2 * pin_r0 - 1);
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// for conical pin: ensure minimum radius of top of pin and pin does not overlap cutout
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pin_r = supports ? r / 2 : min(r / 2 - 0.2, (os.z - 2 * twall - 3 * pin_h0 / 4 - 0.2) / 2);
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pin_h = min(wall + clearance, 2 * pin_r - 1);
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socket_x = r;
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pin_x = socket_x + s.x;
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@ -123,44 +130,51 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
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inner_x = start ? 0 : outer_normal_x - wall; // s.x - clearance - wall
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roof_x_normal = 2 * r - twall;
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roof_x = start ? 0 : roof_x_normal;
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floor_x = start ? 0 : 2 * r;
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cam_x = drag_chain_cam_x(type);
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assert(r + norm([drag_chain_cam_x(type), r - drag_chain_twall(type)]) + clearance <= inner_x || start, "Link must be longer");
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vflip(!supports)
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difference() {
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union() {
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for(side = [-1, 1])
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rotate([90, 0, 0]) {
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// Outer cheeks
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translate_z(side * (os.y / 2 - wall / 2))
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linear_extrude(wall, center = true)
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difference() {
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difference() {
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linear_extrude(wall, center = true)
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hull() {
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if(start)
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square([eps, os.z]);
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else
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translate([socket_x, r])
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rotate(180)
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rotate(supports ? 180 : 0)
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teardrop(r = r, h = 0);
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translate([outer_end_x - eps, 0])
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square([eps, os.z]);
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}
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if(!start)
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translate([socket_x, r])
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horihole(pin_r, r);
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if(supports)
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translate([socket_x, r, 0])
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horihole(pin_r, r, wall + 2*eps);
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else
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translate([socket_x, r, -side * (wall / 2 + clearance)])
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rotate(180)
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hull() {
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horihole(r = pin_r + pin_h / 2, z = r, h = eps);
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translate_z(side * pin_h)
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horihole(r = pin_r - pin_h / 2, z = r, h = eps);
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}
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}
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// Inner cheeks
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translate_z(side * (s.y / 2 + wall / 2))
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translate_z(side * (s.y / 2 + wall / 2)) {
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linear_extrude(wall, center = true)
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difference() {
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union() {
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hull() {
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if(!end) {
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translate([pin_x, r])
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rotate(180)
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rotate(supports ? 180 : 0)
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teardrop(r = r, h = 0);
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translate([pin_x, twall])
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@ -186,31 +200,39 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
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square(os.z);
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}
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}
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// Pin
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if(!end)
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translate([pin_x, r, side * (s.y / 2 + wall + clearance)])
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horicylinder(r = pin_r, z = r, h = 2 * wall);
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// Pin
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if(!end)
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if(supports)
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translate([pin_x, r, side * (wall / 2 + clearance)])
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horicylinder(r = pin_r, z = r, h = 2 * wall + eps);
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else
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translate([pin_x, r, side * wall / 2])
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vflip(side == -1)
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cylinder(r1 = pin_r + pin_h / 2, r2 = pin_r - pin_h / 2, h = pin_h + eps);
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}
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// Cheek joint
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translate([inner_x, 0, side * (s.y / 2 + wall) - 0.5])
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cube([outer_end_x - inner_x, os.z, 1]);
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}
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// Roof, actually the floor when printed
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// Roof, actually the floor when printed with supports
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roof_x = start ? 0 : roof_x_normal;
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roof_end = end ? s.x + 2 * r : s.x + r - twall - clearance;
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translate([roof_x, -s.y / 2 - 0.5])
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cube([roof_end - roof_x , s.y + 1, twall]);
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translate([roof_x, -s.y / 2 - wall, 0]) {
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cube([roof_end - roof_x, s.y + 2 * wall, twall]);
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translate([0, -wall, 0])
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cube([s.x - roof_x - clearance, s.y + 4 * wall, twall]);
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}
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translate([roof_x, -os.y / 2 + 0.5])
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cube([s.x - clearance - roof_x, os.y - 1, twall]);
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// Floor, actually the roof when printed
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// Floor, actually the roof when printed with supports
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floor_x = start ? 0 : 2 * r;
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floor_end = end ? s.x + 2 * r : s.x + r;
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translate([floor_x, -s.y / 2 - wall, os.z - bwall])
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translate([floor_x, -s.y / 2 - wall, os.z - bwall]) {
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cube([floor_end - floor_x, s.y + 2 * wall, bwall]);
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translate([floor_x, -os.y / 2 + 0.5, os.z - bwall])
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cube([s.x - floor_x - clearance, os.y -1, bwall]);
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translate([0, -wall, 0])
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cube([s.x - floor_x - clearance, s.y + 4 * wall, bwall]);
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}
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if(start || end) {
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drag_chain_screw_positions(type, end)
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@ -223,16 +245,16 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
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}
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children();
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}
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}
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} // end union
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if(start || end)
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translate_z(-eps)
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drag_chain_screw_positions(type, end)
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rotate($a)
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poly_cylinder(r = screw_clearance_radius(drag_chain_screw(type)), h = os.z + 2 * eps, center = false);
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} // end difference
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}
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if(show_supports() && !end) {
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if(supports && show_supports() && !end) {
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for(side = [-1, 1]) {
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w = 2.1 * extrusion_width;
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translate([s.x + r + cam_x - w / 2, side * (s.y / 2 + wall / 2), twall / 2])
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@ -277,11 +299,12 @@ module _drag_chain_assembly(type, pos = 0, render = false) {
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module link(n) // Position and colour link with origin at the hinge hole
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translate([-z / 2, 0, -z / 2]) {
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stl_colour(n < 0 || n == npoints - 1 ? pp3_colour : n % 2 ? pp1_colour : pp2_colour)
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render_if(render)
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drag_chain_link(type, start = n == -1, end = n == npoints - 1, check_kids = false)
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let($fasteners = 0)
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children();
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vflip(!drag_chain_supports(type))
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stl_colour(n < 0 || n == npoints - 1 ? pp3_colour : n % 2 ? pp1_colour : pp2_colour)
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render_if(render)
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drag_chain_link(type, start = n == -1, end = n == npoints - 1, check_kids = false)
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let($fasteners = 0)
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children();
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let($fasteners = 1) children();
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}
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