From 1dca024e647d0117f920d77cecf3e93fe4432dfd Mon Sep 17 00:00:00 2001 From: Martin Budden Date: Sun, 23 Feb 2020 18:15:25 +0000 Subject: [PATCH] Internal and external corner brackets for 20nn extrusion. --- tests/extrusionBracket.scad | 61 +++++++++++++++++ vitamins/extrusionBracket.scad | 115 +++++++++++++++++++++++++++++++++ 2 files changed, 176 insertions(+) create mode 100644 tests/extrusionBracket.scad create mode 100644 vitamins/extrusionBracket.scad diff --git a/tests/extrusionBracket.scad b/tests/extrusionBracket.scad new file mode 100644 index 0000000..c17aaa9 --- /dev/null +++ b/tests/extrusionBracket.scad @@ -0,0 +1,61 @@ +// +// 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 . +// +include <../core.scad> + +use <../vitamins/extrusionBracket.scad> +include <../vitamins/extrusions.scad> +include <../vitamins/washers.scad> +include <../vitamins/nuts.scad> + +module extrusionBrackets() { + extrusion20InnerCornerBracket(); + + translate([30, 0]) + extrusion20InnerCornerBracket(grubScrews = false); + + translate([60, 0]) + extrusion20CornerBracket_assembly(); + + eWidth = extrusion_width(E2020); + + translate([0, 60]) { + extrusion20InnerCornerBracket(); + translate([-eWidth / 2, 0, 0]) + rotate([-90, 0, 0]) + extrusion(E2020, 20); + translate([-eWidth, -eWidth / 2, 0]) + rotate([0, 90, 0]) + extrusion(E2020, 40); + } + + translate([60, 60]) { + extrusion20CornerBracket_assembly(); + translate([-eWidth / 2, 0, 0]) + rotate([-90, 0, 0]) + extrusion(E2020, 30); + translate([-eWidth, -eWidth / 2, 0]) + rotate([0, 90, 0]) + extrusion(E2020, 50); + } +} + +if($preview) + let($show_threads = true) + extrusionBrackets(); + diff --git a/vitamins/extrusionBracket.scad b/vitamins/extrusionBracket.scad new file mode 100644 index 0000000..9001f1d --- /dev/null +++ b/vitamins/extrusionBracket.scad @@ -0,0 +1,115 @@ +include +include +include + + +module extrusion20InnerCornerBracket(grubScrews = true) { //! Inner corner bracket for 20mm extrusion + vitamin(str("extrusion20InnerCornerBracket(): Extrusion20 inner corner bracket")); + + size = [25, 25, 4.5]; + armLength = size.x; + bottomTabOffset = 4; + topTabOffset = 10; + sizeBottom = [armLength - bottomTabOffset, 6, size.z]; + sizeTop = [armLength - topTabOffset, 6, size.z]; + tabSizeY1 = 10; + tabSizeY2 = 6; + tabSizeZ = 3.25; + holeRadius = M4_tap_radius; + + translate([-size.z - 0.75, -size.z - 0.75, 0]) + rotate([-90, 0, 0]) { + color("silver") { + translate([(armLength + bottomTabOffset) / 2, 0, tabSizeZ]) + rotate([0, 180, 0]) + extrusionSlidingNut(sizeBottom, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius, (bottomTabOffset - armLength) / 2 + 5); + translate([tabSizeZ, 0, (armLength + topTabOffset) / 2]) + rotate([0, -90, 0]) + extrusionSlidingNut(sizeTop, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius,-(topTabOffset - armLength) / 2 - 5); + translate([0, -size.z / 2, 0]) { + cube([bottomTabOffset, size.z, size.z]); + cube([size.z, size.z, topTabOffset]); + } + } + if(grubScrews) + not_on_bom() no_explode() { + grubScrewLength = 6; + for(angle = [[0, 0, 0], [0, -90, 180]]) + rotate(angle) + translate([armLength - 5, 0, size.z]) + screw(M3_grub_screw, grubScrewLength); + } + } +} + +function extrusion20CornerBracket_base_thickness() = 2; +function extrusion20CornerBracket_hole_offset() = 19.5; + +module extrusion20CornerBracket() { //! Corner bracket for 20mm extrusion + vitamin(str("extrusion20CornerBracket(): Extrusion20 corner bracket")); + + eSize = 20; + cbSize = 28; + baseThickness = extrusion20CornerBracket_base_thickness(); + + module base() { + linear_extrude(baseThickness) + difference() { + translate([0, -eSize / 2, 0]) + square([cbSize, eSize]); + hull() { + translate([extrusion20CornerBracket_hole_offset() + 1.5, 0, 0]) + circle(r = M5_clearance_radius); + translate([extrusion20CornerBracket_hole_offset() - 1.5, 0, 0]) + circle(r = M5_clearance_radius); + } + } + } + + color("silver") { + rotate([90, 0, 90]) + base(); + translate([0, baseThickness, 0]) + rotate([90, 0, 0]) + base(); + sideThickness = 3; + for(z = [-eSize / 2, eSize / 2 - sideThickness]) { + translate_z(z) { + right_triangle(cbSize, cbSize, sideThickness, center = false); + cube([5, cbSize, sideThickness]); + cube([cbSize, 5, sideThickness]); + } + } + } +} + +module extrusion20CornerBracket_hole_positions() { //! Place children at hole positions + for(angle = [ [0, 90, 0], [-90, -90, 0] ]) + rotate(angle) + translate([0, extrusion20CornerBracket_hole_offset(), extrusion20CornerBracket_base_thickness()]) + children(); +} + +module extrusion20CornerBracket_assembly(part_thickness = 2, screw_type = M4_cap_screw, nut_type = M4_sliding_t_nut, max_screw_depth = 6) { //! Assembly with fasteners in place + extrusion20CornerBracket(); + + screw_washer_thickness = washer_thickness(screw_washer(screw_type)); + nut_washer_type = nut_washer(nut_type); + nut_washer_thickness = nut_washer_type ? washer_thickness(nut_washer_type) : 0; + + nut_offset = extrusion20CornerBracket_base_thickness() + part_thickness; + screw_length = max_screw_depth ? screw_shorter_than(extrusion20CornerBracket_base_thickness() + screw_washer_thickness + max_screw_depth) + : screw_longer_than(nut_offset + screw_washer_thickness + nut_washer_thickness + nut_thickness(nut_type)); + + extrusion20CornerBracket_hole_positions() { + screw_and_washer(screw_type, screw_length); + translate_z(-nut_offset) + vflip() + if(nut_washer_type) + nut_and_washer(nut_type); + else + rotate(90) + sliding_t_nut(nut_type); + } +} +