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Merge branch 'drag_chain_no_support_v2' of https://github.com/martinbudden/NopSCADlib into martinbudden-drag_chain_no_support_v2

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Chris Palmer
2021-12-11 13:10:07 +00:00
parent 43c78fd1a3 b1ad206ce4
commit 72700a0acb
1 changed files with 67 additions and 44 deletions
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111
printed/drag_chain.scad
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@@ -35,18 +35,17 @@ include <../core.scad>
use <../utils/horiholes.scad> use <../utils/horiholes.scad>
use <../utils/maths.scad> use <../utils/maths.scad>
clearance = 0.1;
function drag_chain_name(type) = type[0]; //! The name to allow more than one in a project function drag_chain_name(type) = type[0]; //! The name to allow more than one in a project
function drag_chain_size(type) = type[1]; //! The internal size and link length function drag_chain_size(type) = type[1]; //! The internal size and link length
function drag_chain_travel(type) = type[2]; //! X travel function drag_chain_travel(type) = type[2]; //! X travel
function drag_chain_wall(type) = type[3]; //! Side wall thickness function drag_chain_wall(type) = type[3]; //! Side wall thickness
function drag_chain_bwall(type) = type[4]; //! Bottom wall function drag_chain_bwall(type) = type[4]; //! Bottom wall
function drag_chain_twall(type) = type[5]; //! Top wall function drag_chain_twall(type) = type[5]; //! Top wall
function drag_chain_screw(type) = type[6]; //! Mounting screw for the ends function drag_chain_clearance(type) = type[6]; //! Clearance around joints
function drag_chain_screw_lists(type) = type[7]; //! Two lists of four bools to say which screws positions are used function drag_chain_supports(type) = type[7]; //! Whether to print version of chain with or without supports
function drag_chain_screw(type) = type[8]; //! Mounting screw for the ends
function drag_chain_screw_lists(type) = type[9]; //! Two lists of four bools to say which screws positions are used
function drag_chain_clearance() = clearance; //! Clearance around joints.
function drag_chain_radius(type) = //! The bend radius at the pivot centres function drag_chain_radius(type) = //! The bend radius at the pivot centres
let(s = drag_chain_size(type)) let(s = drag_chain_size(type))
@@ -56,12 +55,12 @@ function drag_chain_z(type) = //! Outside dimension of a 180 bend
let(os = drag_chain_outer_size(type), s = drag_chain_size(type)) let(os = drag_chain_outer_size(type), s = drag_chain_size(type))
2 * drag_chain_radius(type) + os.z; 2 * drag_chain_radius(type) + os.z;
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 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
[name, size, travel, wall, bwall, twall, screw, screw_lists]; [name, size, travel, wall, bwall, twall, clearance, supports, screw, screw_lists];
function drag_chain_outer_size(type) = //! Link outer dimensions function drag_chain_outer_size(type) = //! Link outer dimensions
let(s = drag_chain_size(type), z = s.z + drag_chain_bwall(type) + drag_chain_twall(type)) let(s = drag_chain_size(type), z = s.z + drag_chain_bwall(type) + drag_chain_twall(type))
[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * clearance, z]; [s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * drag_chain_clearance(type), z];
function screw_lug_radius(screw) = //! Radius of a screw lug function screw_lug_radius(screw) = //! Radius of a screw lug
corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width; corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width;
@@ -85,6 +84,7 @@ module drag_chain_screw_positions(type, end) { //! Place children at the screw p
r = screw_lug_radius(drag_chain_screw(type)); r = screw_lug_radius(drag_chain_screw(type));
s = drag_chain_size(type); s = drag_chain_size(type);
os = drag_chain_outer_size(type); os = drag_chain_outer_size(type);
clearance = drag_chain_clearance(type);
R = os.z / 2; R = os.z / 2;
x0 = end ? R + norm([drag_chain_cam_x(type), R - drag_chain_twall(type)]) + clearance + r : r; x0 = end ? R + norm([drag_chain_cam_x(type), R - drag_chain_twall(type)]) + clearance + r : r;
x1 = end ? os.x - r : os.x - 2 * R - clearance - r; x1 = end ? os.x - r : os.x - 2 * R - clearance - r;
@@ -99,7 +99,7 @@ function drag_chain_cam_x(type) = // how far the cam sticks out
let(s = drag_chain_size(type), let(s = drag_chain_size(type),
r = drag_chain_outer_size(type).z / 2, r = drag_chain_outer_size(type).z / 2,
wall = drag_chain_wall(type), wall = drag_chain_wall(type),
cam_r = s.x - 2 * clearance - wall - r, // inner_x_normal - clearance - r cam_r = s.x - 2 * drag_chain_clearance(type) - wall - r, // inner_x_normal - clearance - r
twall = drag_chain_twall(type) twall = drag_chain_twall(type)
) min(sqrt(max(sqr(cam_r) - sqr(r - twall), 0)), r); ) min(sqrt(max(sqr(cam_r) - sqr(r - twall), 0)), r);
@@ -111,8 +111,15 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
bwall = drag_chain_bwall(type); bwall = drag_chain_bwall(type);
twall = drag_chain_twall(type); twall = drag_chain_twall(type);
os = drag_chain_outer_size(type); os = drag_chain_outer_size(type);
clearance = drag_chain_clearance(type);
supports = drag_chain_supports(type);
r = os.z / 2; r = os.z / 2;
pin_r = r / 2; // initial estimates of pin_r and pin_h
pin_r0 = r / 2 - 0.2;
pin_h0 = min(wall + clearance, 2 * pin_r0 - 1);
// for conical pin: ensure minimum radius of top of pin and pin does not overlap cutout
pin_r = supports ? r / 2 : min(r / 2 - 0.2, (os.z - 2 * twall - 3 * pin_h0 / 4 - 0.2) / 2);
pin_h = min(wall + clearance, 2 * pin_r - 1);
socket_x = r; socket_x = r;
pin_x = socket_x + s.x; pin_x = socket_x + s.x;
@@ -123,44 +130,51 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
inner_x = start ? 0 : outer_normal_x - wall; // s.x - clearance - wall inner_x = start ? 0 : outer_normal_x - wall; // s.x - clearance - wall
roof_x_normal = 2 * r - twall; roof_x_normal = 2 * r - twall;
roof_x = start ? 0 : roof_x_normal;
floor_x = start ? 0 : 2 * r;
cam_x = drag_chain_cam_x(type); cam_x = drag_chain_cam_x(type);
assert(r + norm([drag_chain_cam_x(type), r - drag_chain_twall(type)]) + clearance <= inner_x || start, "Link must be longer"); assert(r + norm([drag_chain_cam_x(type), r - drag_chain_twall(type)]) + clearance <= inner_x || start, "Link must be longer");
vflip(!supports)
difference() { difference() {
union() { union() {
for(side = [-1, 1]) for(side = [-1, 1])
rotate([90, 0, 0]) { rotate([90, 0, 0]) {
// Outer cheeks // Outer cheeks
translate_z(side * (os.y / 2 - wall / 2)) translate_z(side * (os.y / 2 - wall / 2))
linear_extrude(wall, center = true) difference() {
difference() { linear_extrude(wall, center = true)
hull() { hull() {
if(start) if(start)
square([eps, os.z]); square([eps, os.z]);
else else
translate([socket_x, r]) translate([socket_x, r])
rotate(180) rotate(supports ? 180 : 0)
teardrop(r = r, h = 0); teardrop(r = r, h = 0);
translate([outer_end_x - eps, 0]) translate([outer_end_x - eps, 0])
square([eps, os.z]); square([eps, os.z]);
} }
if(!start) if(!start)
translate([socket_x, r]) if(supports)
horihole(pin_r, r); translate([socket_x, r, 0])
horihole(pin_r, r, wall + 2*eps);
else
translate([socket_x, r, -side * (wall / 2 + clearance)])
rotate(180)
hull() {
horihole(r = pin_r + pin_h / 2, z = r, h = eps);
translate_z(side * pin_h)
horihole(r = pin_r - pin_h / 2, z = r, h = eps);
}
} }
// Inner cheeks // Inner cheeks
translate_z(side * (s.y / 2 + wall / 2)) translate_z(side * (s.y / 2 + wall / 2)) {
linear_extrude(wall, center = true) linear_extrude(wall, center = true)
difference() { difference() {
union() { union() {
hull() { hull() {
if(!end) { if(!end) {
translate([pin_x, r]) translate([pin_x, r])
rotate(180) rotate(supports ? 180 : 0)
teardrop(r = r, h = 0); teardrop(r = r, h = 0);
translate([pin_x, twall]) translate([pin_x, twall])
@@ -186,31 +200,39 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
square(os.z); square(os.z);
} }
} }
// Pin // Pin
if(!end) if(!end)
translate([pin_x, r, side * (s.y / 2 + wall + clearance)]) if(supports)
horicylinder(r = pin_r, z = r, h = 2 * wall); translate([pin_x, r, side * (wall / 2 + clearance)])
horicylinder(r = pin_r, z = r, h = 2 * wall + eps);
else
translate([pin_x, r, side * wall / 2])
vflip(side == -1)
cylinder(r1 = pin_r + pin_h / 2, r2 = pin_r - pin_h / 2, h = pin_h + eps);
}
// Cheek joint // Cheek joint
translate([inner_x, 0, side * (s.y / 2 + wall) - 0.5]) translate([inner_x, 0, side * (s.y / 2 + wall) - 0.5])
cube([outer_end_x - inner_x, os.z, 1]); cube([outer_end_x - inner_x, os.z, 1]);
} }
// Roof, actually the floor when printed // Roof, actually the floor when printed with supports
roof_x = start ? 0 : roof_x_normal;
roof_end = end ? s.x + 2 * r : s.x + r - twall - clearance; roof_end = end ? s.x + 2 * r : s.x + r - twall - clearance;
translate([roof_x, -s.y / 2 - 0.5]) translate([roof_x, -s.y / 2 - wall, 0]) {
cube([roof_end - roof_x , s.y + 1, twall]); cube([roof_end - roof_x, s.y + 2 * wall, twall]);
translate([0, -wall, 0])
cube([s.x - roof_x - clearance, s.y + 4 * wall, twall]);
}
translate([roof_x, -os.y / 2 + 0.5]) // Floor, actually the roof when printed with supports
cube([s.x - clearance - roof_x, os.y - 1, twall]); floor_x = start ? 0 : 2 * r;
// Floor, actually the roof when printed
floor_end = end ? s.x + 2 * r : s.x + r; floor_end = end ? s.x + 2 * r : s.x + r;
translate([floor_x, -s.y / 2 - wall, os.z - bwall]) translate([floor_x, -s.y / 2 - wall, os.z - bwall]) {
cube([floor_end - floor_x, s.y + 2 * wall, bwall]); cube([floor_end - floor_x, s.y + 2 * wall, bwall]);
translate([0, -wall, 0])
translate([floor_x, -os.y / 2 + 0.5, os.z - bwall]) cube([s.x - floor_x - clearance, s.y + 4 * wall, bwall]);
cube([s.x - floor_x - clearance, os.y -1, bwall]); }
if(start || end) { if(start || end) {
drag_chain_screw_positions(type, end) drag_chain_screw_positions(type, end)
@@ -223,16 +245,16 @@ module drag_chain_link(type, start = false, end = false, check_kids = true) { //
} }
children(); children();
} }
} } // end union
if(start || end) if(start || end)
translate_z(-eps) translate_z(-eps)
drag_chain_screw_positions(type, end) drag_chain_screw_positions(type, end)
rotate($a) rotate($a)
poly_cylinder(r = screw_clearance_radius(drag_chain_screw(type)), h = os.z + 2 * eps, center = false); poly_cylinder(r = screw_clearance_radius(drag_chain_screw(type)), h = os.z + 2 * eps, center = false);
} // end difference
} if(supports && show_supports() && !end) {
if(show_supports() && !end) {
for(side = [-1, 1]) { for(side = [-1, 1]) {
w = 2.1 * extrusion_width; w = 2.1 * extrusion_width;
translate([s.x + r + cam_x - w / 2, side * (s.y / 2 + wall / 2), twall / 2]) translate([s.x + r + cam_x - w / 2, side * (s.y / 2 + wall / 2), twall / 2])
@@ -277,11 +299,12 @@ module _drag_chain_assembly(type, pos = 0, render = false) {
module link(n) // Position and colour link with origin at the hinge hole module link(n) // Position and colour link with origin at the hinge hole
translate([-z / 2, 0, -z / 2]) { translate([-z / 2, 0, -z / 2]) {
stl_colour(n < 0 || n == npoints - 1 ? pp3_colour : n % 2 ? pp1_colour : pp2_colour) vflip(!drag_chain_supports(type))
render_if(render) stl_colour(n < 0 || n == npoints - 1 ? pp3_colour : n % 2 ? pp1_colour : pp2_colour)
drag_chain_link(type, start = n == -1, end = n == npoints - 1, check_kids = false) render_if(render)
let($fasteners = 0) drag_chain_link(type, start = n == -1, end = n == npoints - 1, check_kids = false)
children(); let($fasteners = 0)
children();
let($fasteners = 1) children(); let($fasteners = 1) children();
} }