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mirror of https://github.com/nophead/NopSCADlib.git synced 2025-02-16 22:14:36 +01:00
Chris Palmer 2166a9be6a extrusion_corner_bracket_assembly() and extrusion_inner_corner_bracket() can now be passed the extrusion type.
E2020t and E4040t thinner extrusions added to work with the brackets.
Extrusions can now have recessed channels, round or square centre sections and holes.
Fixed the shape of extrusion centre section spars.
T-nuts now have 45 degree chamfers instead of a fixed 1mm minimum thickness.
2021-09-05 10:24:42 +01:00

308 lines
11 KiB
OpenSCAD

//
// NopSCADlib Copyright Chris Palmer 2018
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! Default is steel but can be drawn as brass or nylon. A utility for making nut traps included.
//!
//! If a nut is given a child then it gets placed on its top surface.
//
include <../utils/core/core.scad>
use <washer.scad>
use <screw.scad>
use <../utils/fillet.scad>
use <../utils/rounded_cylinder.scad>
use <../utils/thread.scad>
use <../utils/tube.scad>
brass_colour = brass;
function nut_size(type) = type[1]; //! Diameter of the corresponding screw
function nut_radius(type) = type[2] / 2; //! Radius across the corners
function nut_thickness(type, nyloc = false) = nyloc ? type[4] : type[3]; //! Thickness of plain or nyloc version
function nut_washer(type) = type[5]; //! Corresponding washer
function nut_trap_depth(type) = type[6]; //! Depth of nut trap
function nut_pitch(type) = type[7]; //! Pitch if not standard metric course thread
function nut_flat_radius(type) = nut_radius(type) * cos(30); //! Radius across the flats
function nut_square_size(type) = type[1]; //! Diameter of the corresponding screw
function nut_square_width(type) = type[2]; //! Width of the square nut
function nut_square_thickness(type) = type[3]; //! Thickness of the square nut
module nut(type, nyloc = false, brass = false, nylon = false) { //! Draw specified nut
thread_d = nut_size(type);
thread_p = nut_pitch(type) ? nut_pitch(type) : metric_coarse_pitch(thread_d);
hole_rad = thread_d / 2;
outer_rad = nut_radius(type);
thickness = nut_thickness(type);
nyloc_thickness = nut_thickness(type, true);
desc = nyloc ? "nyloc" : brass ? "brass" : nylon ? "nylon" : "";
vitamin(str("nut(", type[0], arg(nyloc, false, "nyloc"), arg(brass, false, "brass"), arg(nylon, false, "nylon"),
"): Nut M", nut_size(type), " x ", thickness, "mm ", desc));
colour = brass ? brass_colour : nylon ? grey(30): grey(70);
explode(nyloc ? 10 : 0) {
color(colour) {
linear_extrude(thickness)
difference() {
circle(outer_rad, $fn = 6);
circle(hole_rad);
}
if(nyloc)
translate_z(-eps)
rounded_cylinder(r = outer_rad * cos(30) , h = nyloc_thickness, r2 = (nyloc_thickness - thickness) / 2, ir = hole_rad);
}
if(show_threads)
female_metric_thread(thread_d, thread_p, thickness, center = false, colour = colour);
if(nyloc)
translate_z(thickness)
color("royalblue")
tube(or = thread_d / 2 + eps, ir = (thread_d * 0.8) / 2, h = (nyloc_thickness - thickness) * 0.8, center = false);
}
if($children)
translate_z(nut_thickness(type, nyloc))
children();
}
module nut_and_washer(type, nyloc) { //! Draw nut with corresponding washer
washer = nut_washer(type);
translate_z(exploded() ? 7 : 0)
washer(washer);
translate_z(washer_thickness(washer))
nut(type, nyloc);
}
module wingnut(type) { //! Draw a wingnut
thread_d = nut_size(type);
hole_rad = thread_d / 2;
bottom_rad = nut_radius(type);
top_rad = type[4] / 2;
thickness = nut_thickness(type);
wing_span = type[7];
wing_height = type[8];
wing_width = type[9];
wing_thickness = type[10];
top_angle = asin((wing_thickness / 2) / top_rad);
bottom_angle = asin((wing_thickness / 2) / bottom_rad);
vitamin(str("wingnut(", type[0], "): Wingnut M", nut_size(type)));
colour = silver;
explode(10) {
color(colour) {
rotate_extrude()
polygon([
[hole_rad, 0],
[bottom_rad, 0],
[top_rad,, thickness],
[hole_rad, thickness]
]);
for(rot = [0, 180])
rotate([90, 0, rot]) linear_extrude(wing_thickness, center = true)
hull() {
translate([wing_span / 2 - wing_width / 2, wing_height - wing_width / 2])
circle(wing_width / 2);
polygon([
[bottom_rad * cos(top_angle) - eps, 0],
[wing_span / 2 - wing_width / 2, wing_height - wing_width / 2],
[top_rad * cos(top_angle) - eps, thickness],
]);
}
}
if(show_threads)
female_metric_thread(thread_d, metric_coarse_pitch(thread_d), thickness, center = false, colour = colour);
}
}
function t_nut_tab(type) = [type[8], type[9]]; //! Sliding t-nut T dimensions
module sliding_ball_t_nut(size, w, h, r) {
rad = 0.5;
stem = size.z - h;
ball_d = 4;
offset = 12;
module shape()
rotate([90, 0, 90])
translate_z(-offset)
linear_extrude(size.x) {
hull() {
translate([0, h - size.y / 2])
semi_circle(d = size.y);
for(side = [-1, 1])
translate([side * (w / 2 - rad), rad])
circle(rad);
}
rounded_square([size.y, stem * 2], rad / 2, true);
}
render() difference() {
shape();
cylinder(r = r, h = 100, center = true);
}
translate([-offset + ball_d, 0, h - 0.4])
sphere(d = ball_d);
if(show_threads)
render() intersection() {
translate_z(-stem)
female_metric_thread(2 * r, metric_coarse_pitch(2 * r), size.z - 2, center = false);
shape();
}
}
module sliding_t_nut(type) { //! Draw a sliding T nut, T nut with a spring loaded ball or a hammer nut.
hammerNut = type[10];
size = [type[7], nut_square_width(type), nut_thickness(type, true)];
tab = t_nut_tab(type);
tabSizeZ = nut_thickness(type);
holeRadius = nut_size(type) / 2;
vitamin(str("sliding_t_nut(", type[0], "): Nut M", nut_size(type), hammerNut ? " hammer" : " sliding T", !tab[1] ? " with spring loaded ball" : ""));
color(grey(80))
if(!tab[1])
sliding_ball_t_nut(size, tab[0], tabSizeZ, holeRadius);
else
extrusionSlidingNut(size, tab[0], tab[1], tabSizeZ, holeRadius, 0, hammerNut);
}
module extrusionSlidingNut(size, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius, holeOffset = 0, hammerNut = false) {
// center section
stem_h = size.z - tabSizeZ;
translate_z(-stem_h)
linear_extrude(stem_h)
difference() {
square([size.x, size.y], center = true);
if(hammerNut) {
translate([size.x / 2, size.y / 2])
rotate(180)
fillet(1);
translate([-size.x / 2, -size.y / 2])
fillet(1);
}
if(holeRadius)
translate([holeOffset, 0])
circle(holeRadius);
}
linear_extrude(tabSizeZ)
difference() {
square([size.x, tabSizeY1 == tabSizeY2 ? size.y : tabSizeY2], center = true);
if(holeRadius)
translate([holeOffset, 0])
circle(holeRadius);
}
thread_d = 2 * holeRadius;
if(show_threads)
translate([holeOffset, 0, -stem_h])
female_metric_thread(thread_d, metric_coarse_pitch(thread_d), size.z, center = false);
// add the side tabs
tab_h = size.z - 2 * stem_h;
chamfer =tab_h / 4;
for(m = [0, 1])
mirror([0, m, 0])
if(tabSizeY1 == tabSizeY2)
translate([-size.x / 2, size.y / 2])
hull() {
cube([size.x, (tabSizeY1 - size.y) / 2 - chamfer, tab_h]);
translate_z(chamfer)
cube([size.x, (tabSizeY1 - size.y) / 2,tab_h - 2 * chamfer]);
}
else {
dy = (tabSizeY1 - tabSizeY2) / 2;
cubeZ = tabSizeZ - dy;
translate([-size.x / 2, tabSizeY2 / 2])
cube([size.x, (tabSizeY1 - tabSizeY2) / 2, cubeZ]);
translate([0, tabSizeY2 / 2, cubeZ])
rotate([0, -90, 0])
right_triangle(tabSizeZ - cubeZ, dy, size.x, center = true);
}
}
module nut_square(type, brass = false, nylon = false) { //! Draw specified square nut
thread_d = nut_size(type);
hole_rad = thread_d / 2;
width = nut_square_width(type);
thickness = nut_square_thickness(type);
desc = brass ? "brass" : nylon ? "nylon" : "";
vitamin(str("nut(", type[0], arg(brass, false, "brass"), arg(nylon, false, "nylon"),
"): Nut M", nut_size(type), "nS ", width, " x ", thickness, "mm ", desc));
colour = brass ? brass_colour : nylon ? grey(30) : grey(70);
color(colour)
difference() {
linear_extrude(thickness) {
difference() {
square([width, width], center = true);
circle(hole_rad);
}
}
}
if(show_threads)
female_metric_thread(thread_d, metric_coarse_pitch(thread_d), thickness, center = false, colour = colour);
}
function nut_trap_radius(nut, horizontal = false) = nut_radius(nut) + (horizontal ? layer_height / 4 : 0); //! Radius across the corners of a nut trap
function nut_trap_flat_radius(nut, horizontal = false) = nut_trap_radius(nut, horizontal) * cos(30); //! Radius across the flats of a nut trap
module nut_trap(screw, nut, depth = 0, horizontal = false, supported = false, h = 200) { //! Make a nut trap
nut_r = is_list(nut) ? nut_trap_radius(nut, horizontal) : nut + (horizontal ? layer_height / 4 : 0);
nut_d = depth ? depth : nut_trap_depth(nut);
screw_r = is_list(screw) ? screw_clearance_radius(screw) : screw;
render(convexity = 5) union() {
if(horizontal) {
if(screw_r)
teardrop_plus(r = screw_r, h = h);
cylinder(r = nut_r, h = nut_d * 2, center = true, $fn = 6);
}
else {
difference() {
union() {
if(screw_r)
poly_cylinder(r = screw_r, h = h, center = true);
cylinder(r = nut_r, h = nut_d * 2, center = true, $fn = 6);
}
if(supported)
translate_z(nut_d - eps)
cylinder(r = nut_r + eps, h = layer_height, center = false);
}
}
}
}