NopSCADlib/printed/door_latch.scad

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//
// 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/>.
//
//
//! Door latch for 6mm acrylic door for 3D printer. See [door_hinge](#door_hinge).
//
include <../core.scad>
use <../utils/hanging_hole.scad>
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length = 35;
width = 12;
height = 14.25;
thickness = 5;
rad = 3;
screw = M4_hex_screw;
function door_latch_screw() = screw; //! The screw used for the axle
function door_latch_offset() = width / 2 + 1; //! Offset of the axle from the door edge
nut_trap_depth = round_to_layer(screw_head_height(screw)) + 4 * layer_height;
module door_latch_stl() { //! Generates the STL for the printed part
stl("door_latch");
ridge = 4;
difference() {
union() {
hull() {
rounded_rectangle([length, width, thickness - tan(30) * (width - ridge) / 2], rad, center = false);
translate_z(thickness / 2)
cube([length, ridge, thickness], center = true);
}
cylinder(d = width, h = height);
}
hanging_hole(nut_trap_depth, screw_clearance_radius(screw))
circle(r = nut_trap_radius(screw_nut(screw)), $fn = 6);
}
}
module door_latch_assembly(sheet_thickness = 3) { //! The assembly for a specified sheet thickess
washer = screw_washer(screw);
nut = screw_nut(screw);
screw_length = screw_longer_than(height - nut_trap_depth + sheet_thickness + 2 * washer_thickness(washer) + nut_thickness(nut, true));
translate([0, -height - washer_thickness(washer)])
rotate([-90, 0, 0]) {
stl_colour(pp1_colour) render() door_latch_stl();
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translate_z(nut_trap_depth)
vflip()
screw(screw, screw_length);
translate_z(height)
washer(washer);
translate_z(height + sheet_thickness + washer_thickness(washer))
nut_and_washer(nut, true);
}
}