123 lines
4.1 KiB
OpenSCAD
123 lines
4.1 KiB
OpenSCAD
//
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// NopSCADlib Copyright Chris Palmer 2019
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// This file is part of NopSCADlib.
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//
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// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
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// GNU General Public License as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with NopSCADlib.
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// If not, see <https://www.gnu.org/licenses/>.
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//
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//
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//! A frame to mount a PCB by its corners when it has no mounting holes.
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//! The stl must be given a parameterless wrapper in the project that uses it.
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//
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include <../core.scad>
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use <../vitamins/pcb.scad>
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clearance = 0.2;
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min_wall = extrusion_width * 2;
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wall = 2;
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overlap = 2;
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screw = M3_cap_screw;
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screw_clearance_r = 3.1 / 2;
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pillar_r = corrected_radius(screw_clearance_r) + wall;
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function pillar_x_pitch(pcb) = pcb_length(pcb) + 2 * clearance + 2 * (pillar_r - overlap) / sqrt(2); //! x pitch of screw pillars
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function pillar_y_pitch(pcb) = pcb_width(pcb) + 2 * clearance + 2 * (pillar_r - overlap) / sqrt(2); //! y pitch of screw pillars
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function pcb_mount_length(pcb) = pillar_x_pitch(pcb) + 2 * pillar_r; //! Outside length of the mount
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function pcb_mount_width(pcb) = pillar_y_pitch(pcb) + 2 * pillar_r; //! Outside width of the mount
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frame_w = 3;
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frame_t = 2;
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washer_thickness = 1.25;
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module pcb_mount_screw_positions(pcb) //! Positions of the screws and pillars
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for(x = [-1, 1], y = [-1, 1])
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translate([x * pillar_x_pitch(pcb) / 2, y * pillar_y_pitch(pcb) / 2])
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children();
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module pcb_mount_holes(pcb, h = 0) //! Drill holes for PCB mount
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pcb_mount_screw_positions(pcb)
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drill(screw_clearance_radius(screw), h);
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module pcb_mount_ring()
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difference() {
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circle(pillar_r);
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poly_circle(screw_clearance_r);
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}
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module pcb_mount_washer_stl() //! A plastic washer to clamp a PCB
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linear_extrude(washer_thickness)
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pcb_mount_ring();
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module pcb_mount(pcb, height = 5, washers = true) { //! Make the STL of a pcb mount for the specified PCB.
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stl(str("pcb_mount_", pcb[0], "_", height));
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y_pitch = pcb_width(pcb) > 4 * pillar_r + 4 ? pillar_r + 1
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: pcb_width(pcb) / 2 + frame_w + 1 + pillar_r;
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if(washers)
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for(x = [-1, 1], y = [-1, 1])
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translate([x * (pillar_r + 1), y * y_pitch, 0])
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pcb_mount_washer_stl();
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for(x = [-1, 1])
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translate([x * pillar_x_pitch(pcb) / 2, 0, frame_t / 2])
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cube([frame_w, pillar_y_pitch(pcb) - 2 * wall, frame_t], center = true);
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for(y = [-1, 1])
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translate([0, y * pillar_y_pitch(pcb) / 2, frame_t / 2])
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cube([pillar_x_pitch(pcb) - 2 * wall, frame_w, frame_t], center = true);
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pcb_mount_screw_positions(pcb)
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linear_extrude(height)
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pcb_mount_ring();
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linear_extrude(height + pcb_thickness(pcb) - layer_height)
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difference() {
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pcb_mount_screw_positions(pcb)
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pcb_mount_ring();
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square([pcb_length(pcb) + 2 * clearance, pcb_width(pcb) + 2 * clearance], center = true);
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}
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}
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module pcb_mount_assembly(pcb, thickness, height = 5) { //! A PCB mount assembly with fasteners
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translate_z(height)
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pcb(pcb);
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stl_colour(pp1_colour) pcb_mount(pcb, washers = false);
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nut = screw_nut(screw);
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t = pcb_thickness(pcb);
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screw_length = screw_length(screw, height + t + washer_thickness + thickness, 1, nyloc = true);
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pcb_mount_screw_positions(pcb) {
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translate_z(height + t) {
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stl_colour(pp2_colour) pcb_mount_washer_stl();
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translate_z(washer_thickness)
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screw(screw, screw_length);
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}
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translate_z(-thickness)
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vflip()
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nut_and_washer(nut, true);
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}
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}
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