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Finished end links.

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This commit is contained in:
Chris Palmer
2020-11-17 16:14:25 +00:00
parent 9944aab73e
commit 4dc83d62cb
3 changed files with 164 additions and 90 deletions
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244
printed/drag_chain.scad
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@@ -20,7 +20,7 @@
//
//! Parametric cable drag chain to limit the bend radius of a cable run.
//!
//! Each link has a maximum bend angle, so the mininium radius is proportional to the link length.
//! Each link has a maximum bend angle of 45°, so the mininium radius is proportional to the link length.
//!
//! The travel prpoery is how far it can move in each direction, i.e. half the maximum travel if the chain is mounted in the middle of the travel.
//
@@ -29,12 +29,14 @@ include <../core.scad>
use <../utils/horiholes.scad>
use <../utils/maths.scad>
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_travel(type)= type[2]; //! X travel
function drag_chain_wall(type) = type[3]; //! Side wall thickness
function drag_chain_bwall(type) = type[4]; //! Bottom wall
function drag_chain_twall(type) = type[5]; //! Top wall
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_travel(type) = type[2]; //! X travel
function drag_chain_wall(type) = type[3]; //! Side wall thickness
function drag_chain_bwall(type) = type[4]; //! Bottom 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_screw_lists(type) = type[7]; //! Two lists of four bools to say which screws positions are used
function drag_chain_radius(type) = //! The bend radius at the pivot centres
let(s = drag_chain_size(type))
@@ -44,8 +46,8 @@ function drag_chain_z(type) = //! Outside dimension of a 180 bend
let(os = drag_chain_outer_size(type), s = drag_chain_size(type))
2 * drag_chain_radius(type) + os.z;
function drag_chain(name, size, travel, wall = 1.6, bwall = 1.5, twall = 1.5) = //! Constructor
[name, size, travel, wall, bwall, twall];
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
[name, size, travel, wall, bwall, twall, screw, screw_lists];
clearance = 0.1;
@@ -53,8 +55,53 @@ 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))
[s.x + z, s.y + 4 * drag_chain_wall(type) + 2 * clearance, z];
function screw_lug_radius(screw) = //! Radius if a screw lug
corrected_radius(screw_clearance_radius(screw)) + 3.1 * extrusion_width;
module drag_chain_link(type, start = false, end = false) {
module screw_lug(screw, h = 0) //! Create a D shaped lug for a screw
extrude_if(h, center = false)
difference() {
r = screw_lug_radius(screw);
hull() {
circle4n(r);
translate([-r, -r])
square([2 * r, eps]);
}
poly_circle(screw_clearance_radius(screw));
}
function bool2int(b) = b ? 1 : 0;
module drag_chain_screw_positions(type, end) {//! Place children at the screw positions, end = 0 for the start, 1 for the end
r = screw_lug_radius(drag_chain_screw(type));
s = drag_chain_size(type);
os = drag_chain_outer_size(type);
R = os.z / 2;
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;
for(i = [0 : 3]) {
x = i % 2;
y = bool2int(i > 1);
if(drag_chain_screw_lists(type)[bool2int(end)][i])
translate([(x0 + x1) / 2, 0])
mirror([x, 0])
mirror([0, y])
translate([(x1 - x0) / 2, s.y / 2 + r])
children();
}
}
function drag_chain_cam_x(type) = // how far the cam sticks out
let(s = drag_chain_size(type),
r = drag_chain_outer_size(type).z / 2,
wall = drag_chain_wall(type),
cam_r = s.x - 2 * clearance - wall - r, // inner_x_normal - clearance - r
twall = drag_chain_twall(type)
) min(sqrt(max(sqr(cam_r) - sqr(r - twall), 0)), r);
module drag_chain_link(type, start = false, end = false) { //! One link of the chain, special case for start and end
stl(str(drag_chain_name(type), "_drag_chain_link", start ? "_start" : end ? "_end" : ""));
s = drag_chain_size(type);
@@ -64,96 +111,115 @@ module drag_chain_link(type, start = false, end = false) {
os = drag_chain_outer_size(type);
r = os.z / 2;
pin_r = r / 2;
inner_x_normal = s.x - wall;
inner_x = start ? 0 : s.x - inner_x_normal;
socket_x = r;
pin_x = socket_x + s.x;
outer_normal_x = pin_x - r - clearance; // s.x - clearance
outer_end_x = end ? os.x : outer_normal_x;
inner_x = start ? 0 : outer_normal_x - wall; // s.x - clearance - wall
roof_x_normal = 2 * r - twall;
roof_x = start ? 0 : roof_x_normal;
floor_x = start ? 0 : 2 * r;
cam_r = inner_x_normal - clearance - r;
cam_x = min(sqrt(max(sqr(cam_r) - sqr(r - twall), 0)), r);
outer_end_x = end ? os.x : s.x - clearance;
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");
for(side = [-1, 1])
rotate([90, 0, 0]) {
// Outer cheeks
translate_z(side * (os.y / 2 - wall / 2))
linear_extrude(wall, center = true)
difference() {
hull() {
if(start)
translate([floor_x, 0])
square([eps, os.z]);
else
translate([r, r])
rotate(180)
teardrop(r = r, h = 0);
translate([outer_end_x - eps, 0])
square([eps, os.z]);
}
if(!start)
translate([r, r])
horihole(pin_r, r);
}
// Inner cheeks
translate_z(side * (s.y / 2 + wall / 2))
linear_extrude(wall, center = true)
difference() {
union() {
hull() {
if(!end) {
translate([s.x + r, r])
rotate(180)
teardrop(r = r, h = 0);
translate([s.x + r, twall])
square([cam_x, eps]);
}
else
translate([s.x + 2 * r - eps, 0])
difference() {
union() {
for(side = [-1, 1])
rotate([90, 0, 0]) {
// Outer cheeks
translate_z(side * (os.y / 2 - wall / 2))
linear_extrude(wall, center = true)
difference() {
hull() {
if(start)
square([eps, os.z]);
else
translate([socket_x, r])
rotate(180)
teardrop(r = r, h = 0);
translate([inner_x, 0])
square([eps, os.z]);
translate([outer_end_x - eps, 0])
square([eps, os.z]);
}
if(!start)
translate([socket_x, r])
horihole(pin_r, r);
}
}
// Cutout for top wall
if(!end)
intersection() {
translate([s.x, 0])
square([3 * r, twall]); // When straight
// Inner cheeks
translate_z(side * (s.y / 2 + wall / 2))
linear_extrude(wall, center = true)
difference() {
union() {
hull() {
if(!end) {
translate([pin_x, r])
rotate(180)
teardrop(r = r, h = 0);
translate([s.x + r, r])
rotate(-45)
translate([-r + roof_x_normal, -r - twall]) // When bent fully
square(os.z);
translate([pin_x, twall])
square([cam_x, eps]);
}
else
translate([os.x - eps, 0])
square([eps, os.z]);
translate([inner_x, 0])
square([eps, os.z]);
}
}
// Cutout for top wall
if(!end)
intersection() {
translate([pin_x - r, 0])
square([3 * r, twall]); // When straight
translate([pin_x, r])
rotate(-45)
translate([-r + roof_x_normal, -r - twall]) // When bent fully
square(os.z);
}
}
}
// Pin
if(!end)
translate([s.x + r, r, side * (s.y / 2 + wall + clearance)])
horicylinder(r = pin_r, z = r, h = 2 * wall);
// Pin
if(!end)
translate([pin_x, r, side * (s.y / 2 + wall + clearance)])
horicylinder(r = pin_r, z = r, h = 2 * wall);
// Cheek joint
translate([inner_x, 0, side * (s.y / 2 + wall) - 0.5])
cube([outer_end_x - inner_x, os.z, 1]);
// Cheek joint
translate([inner_x, 0, side * (s.y / 2 + wall) - 0.5])
cube([outer_end_x - inner_x, os.z, 1]);
}
// Roof, actually the floor when printed
roof_end = end ? s.x + 2 * r : s.x + r - twall - clearance;
translate([roof_x, -s.y / 2 - 0.5])
cube([roof_end - roof_x , s.y + 1, twall]);
translate([roof_x, -os.y / 2 + 0.5])
cube([s.x - clearance - roof_x, os.y - 1, twall]);
// Floor, actually the roof when printed
floor_end = end ? s.x + 2 * r : s.x + r;
translate([floor_x, -s.y / 2 - wall, os.z - bwall])
cube([floor_end - floor_x, s.y + 2 * wall, bwall]);
translate([floor_x, -os.y / 2 + 0.5, os.z - bwall])
cube([s.x - floor_x - clearance, os.y -1, bwall]);
if(start || end)
drag_chain_screw_positions(type, end)
screw_lug(drag_chain_screw(type), os.z);
}
if(start || end)
translate_z(-eps)
drag_chain_screw_positions(type, end)
poly_cylinder(r = screw_clearance_radius(drag_chain_screw(type)), h = os.z + 2 * eps, center = false);
// Roof, actually the floor when printed
roof_end = end ? s.x + 2 * r : s.x + r - twall - clearance;
translate([roof_x, -s.y / 2 - wall])
cube([roof_end - roof_x , s.y + 2 * wall, twall]);
translate([roof_x, -os.y / 2 + 0.5])
cube([s.x - clearance - roof_x, os.y - 1, twall]);
// Base, actually the roof when printed
floor_end = end ? s.x + 2 * r : s.x + r;
translate([floor_x, -s.y / 2 - wall, os.z - bwall])
cube([floor_end - floor_x, s.y + 2 * wall, bwall]);
translate([floor_x, -os.y / 2 + 0.5, os.z - bwall])
cube([s.x - floor_x - clearance, os.y -1, bwall]);
}
if(show_supports() && !end) {
for(side = [-1, 1]) {
@@ -173,6 +239,8 @@ module drag_chain_link(type, start = false, end = false) {
}
}
//! 1. Remove the support material from the links with side cutters.
//! 1. Clip the links together with the special ones at the ends.
module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
s = drag_chain_size(type);
r = drag_chain_radius(type);