140 lines
3.4 KiB
OpenSCAD
140 lines
3.4 KiB
OpenSCAD
include <units.inc>;
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include <stock_parts.scad>;
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frame_size = 20;
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wall_thickness = 2;
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corner_size=30;
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// The length along each edge that the corner bracket takes. I.e., if
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// you construct a frame of four corner brackets and 4 tubes of length
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// $L-$corner_size, the distance between opposite tubes' centerlines
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// will be $L.
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corner_offset = frame_size / 2 + wall_thickness;
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rail_diam = 8;
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ysled_extralen = frame_size; // on each end
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// Generates bar of length $l, centered on origin extending in +Z
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module tslot(l) {
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colorize(stock_color) {
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translate([-frame_size/2, -frame_size/2, 0])
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cube([frame_size, frame_size, l]);
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}
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}
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// A corner, with tubes extending in +x and +y.
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module corner_base() {
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odim = frame_size/2 + wall_thickness;
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ldim = frame_size/2 + corner_size;
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cap_points = [[-odim, -odim],
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[-odim, ldim],
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[ odim, ldim],
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[ ldim, odim],
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[ ldim, -odim]];
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difference() {
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translate([0, 0, -odim])
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linear_extrude(odim * 2)
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polygon(points = cap_points);
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// two bars...
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translate([-frame_size/2, corner_offset, -frame_size/2])
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cube([frame_size, ldim, frame_size]);
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translate([corner_offset, -frame_size/2, -frame_size/2])
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cube([ldim, frame_size, frame_size]);
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translate([corner_offset, corner_offset, -frame_size/2])
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cube([ldim, ldim, frame_size]);
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//translate([-odim - 1, -odim - 1, 0])
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//cube(ldim*2);
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}
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}
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module rail_holder(in_x) {
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odim = frame_size/2 + wall_thickness;
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ldim = frame_size/2 + corner_size;
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tube_offset = (corner_size) / 2 + wall_thickness;
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tube_rotation = in_x ? 90 : 0;
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translate([frame_size/2, frame_size/2, -frame_size/2]) {
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difference() {
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linear_extrude(frame_size)
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polygon(points = [[wall_thickness, wall_thickness],
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[wall_thickness, corner_size],
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[corner_size, wall_thickness]]);
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translate([corner_size / 2, corner_size/2, frame_size/2])
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rotate([tube_rotation -90, tube_rotation, 0])
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translate([0, 0, -corner_size])
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cylinder(d = rail_diam, corner_size * 2);
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}
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}
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}
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// centered on
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module ysled(spread = 6*inch, associated_parts = false) {
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sled_len = spread + ysled_extralen * 2;
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sled_height = frame_size;
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colorize("green")
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render()
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translate([0, -sled_len/2, 0])
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rotate([-90, 0, 0]) {
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difference() {
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union() {
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translate([-frame_size/2, -frame_size/2, 0])
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cube([frame_size + 5, frame_size, sled_len]);
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}
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cylinder(d = bushing_id * 1.1, h = sled_len);
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translate([0,0,-1])
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cylinder(d = bushing_od, h = bushing_len+1);
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translate([0,0,sled_len - bushing_len])
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cylinder(d = bushing_od, h = bushing_len+1);
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for (zpos = [frame_size / 2, sled_len - frame_size / 2]) {
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translate([sled_height/2, 0, zpos])
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rotate([0,90,0]) {
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cylinder(h = sled_height + 1, d = rail_diam);
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}
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}
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}
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}
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// TODO: add posts for the idlers
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translate([0, -sled_len/2, 0])
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rotate([-90, 0, 0])
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if (associated_parts) {
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bushing();
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translate([0,0,sled_len - bushing_len]) bushing();
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}
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}
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module flcorner() {
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translate([0, 0, 0])
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rotate([0, 0, 0]) {
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corner_base();
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rail_holder(false);
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}
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}
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module frcorner() {
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rotate([0, 0, 90]) {
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corner_base();
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rail_holder(true);
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}
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}
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module blcorner() {
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rotate([0, 0, 270]) {
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corner_base();
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rail_holder(true);
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}
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}
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module brcorner() {
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rotate([0, 0, 180]) {
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corner_base();
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rail_holder(false);
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}
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}
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