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Added parametric printed hinges.
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Chris Palmer
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printed/flat_hinge.scad
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180
printed/flat_hinge.scad
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//
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// NopSCADlib Copyright Chris Palmer 2018
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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 parametric flat hinge. A piece of filament can be used for the hinge pin.
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//!
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//! The width, depth, thickness, number and type of screws, number of knuckles, knuckle diameter, pin diameter and clearance can all be varied.
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//! A margin between the screws and the knuckle edge can be enforced to allow the hinge to bend all the way back to 270° from closed.
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//!
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//! Opening the test in OpenSCAD with its customiser enabled allows these parameters to be played with.
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//!
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//! Note setting ```thickness1``` or ```thickness2``` to zero in the ```hinge_fastened_assembly()``` removes the screws from one side or the other and
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//! setting ```show_hinge``` to false removes the hinge.
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//! This allows the hinges and one set of screws to belong to one assembly and the other set of screws to another assembly.
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//
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include <../core.scad>
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include <../vitamins/screws.scad>
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function hinge_width(type) = type[1]; //! Width
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function hinge_depth(type) = type[2]; //! Depth of each leaf
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function hinge_thickness(type) = type[3]; //! Thickness of the leaves
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function hinge_pin_dia(type) = type[4]; //! The pin diameter
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function hinge_knuckle_dia(type) = type[5]; //! The knuckle diameter
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function hinge_knuckles(type) = type[6]; //! How many knuckles
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function hinge_screw(type) = type[7]; //! Screw type to mount it
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function hinge_screws(type) = type[8]; //! How many screws
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function hinge_clearance(type) = type[9]; //! Clearance between knuckles
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function hinge_margin(type) = type[10]; //! How far to keep the screws from the knuckes
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function hinge_radius(type) = washer_radius(screw_washer(hinge_screw(type))) + 1;
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module hinge_screw_positions(type) { //! Place children at the screw positions
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screws = hinge_screws(type);
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w = hinge_width(type);
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d = hinge_depth(type);
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r = hinge_radius(type);
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m = hinge_margin(type);
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assert(screws > 1, "must be at least two screws");
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w_pitch = (w - 2 * r) / (screws - 1);
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d_pitch = d - 2 * r - m;
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wr = washer_radius(screw_washer(hinge_screw(type)));
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assert(w_pitch >= wr && norm([w_pitch, d_pitch]) >= 2 * wr && d_pitch >= 0, "not enough room for screws");
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for(i = [0 : screws - 1])
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translate([-w / 2 + r + i * w_pitch, r + m + (i % 2) * d_pitch])
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children();
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}
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module hinge_male(type, female = false) { //! The half with the stationary pin
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stl(str("hinge_", female ? "fe": "", "male_", type[0]));
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r = hinge_radius(type);
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w = hinge_width(type);
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t = hinge_thickness(type);
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kr = hinge_knuckle_dia(type) / 2;
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pr = hinge_pin_dia(type) / 2;
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assert(kr > pr, "knuckle diameter must be bigger than the pin diameter");
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n = hinge_knuckles(type);
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assert(n >= 3, "must be at least three knuckes");
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mn = ceil(n / 2); // Male knuckles
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fn = floor(n / 2); // Female knuckles
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gap = hinge_clearance(type);
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mw = (w - (n - 1) * gap) / 2 / mn; // Male knuckle width
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fw = (w - (n - 1) * gap) / 2 / fn; // Female knuckle width
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teardrop_r = kr / cos(22.5); // The corner on the teardrop
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inset = sqrt(sqr(teardrop_r + gap) - sqr(kr - t)) - kr;
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linear_extrude(height =t)
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difference() {
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hull() {
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for(side = [-1, 1])
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translate([side * (w / 2 - r), hinge_depth(type) - r])
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circle4n(r);
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translate([-w / 2, inset])
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square([w, eps]);
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}
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hinge_screw_positions(type)
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poly_circle(screw_clearance_radius(hinge_screw(type)));
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}
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pitch = mw + gap + fw + gap;
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dir = female ? -1 : 1;
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translate([0, -kr, kr])
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rotate([90, 0, -90])
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for(z = [0 : (female ? fn : mn) - 1])
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translate_z(-dir * w / 2 + z * dir * pitch + (female ? -fw - mw - gap : 0))
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linear_extrude(height = female ? fw : mw)
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difference() {
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hull() {
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rotate(180)
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teardrop(r = kr, h = 0);
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translate([-kr - 1, -kr])
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square(1);
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}
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teardrop_plus(r = pr + (female ? gap : 0), h = 0);
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}
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}
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module hinge_female(type) hinge_male(type, true);
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module hinge_both(type) { //! Both parts together for printing
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hinge_male(type);
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translate([0, -hinge_knuckle_dia(type)])
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rotate(180)
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hinge_female(type);
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}
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module hinge_assembly(type, angle = 0)
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assembly(str("hinge_", type[0])) { //! Assembled hinge
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kr = hinge_knuckle_dia(type) / 2;
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hr = hinge_pin_dia(type) / 2;
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w = hinge_width(type);
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vitamin(str(": Hinge pin ", w, " x ", 2 * hr, "mm"));
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color(pp1_colour) hinge_male(type);
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translate([0, -kr, kr]) {
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rotate([0, 90, 0])
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explode(w + 10)
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color("silver") cylinder(r = hr , h = w, center = true);
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rotate([-angle, 0, 0])
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translate([0, -kr, -kr])
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rotate(180)
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color(pp2_colour) hinge_female(type);
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}
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}
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module hinge_fastened_assembly(type, thickness1, thickness2, angle, show_hinge = true) { //! Assembled hinge with its fasteners
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if(show_hinge)
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hinge_assembly(type, angle);
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screw = hinge_screw(type);
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washer_t = 2 * washer_thickness(screw_washer(screw));
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nut = screw_nut(screw);
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nut_t = nut_thickness(nut, true);
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t = hinge_thickness(type);
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kr = hinge_knuckle_dia(type) / 2;
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module fasteners(thickness)
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if(thickness)
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hinge_screw_positions(type) {
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translate_z(t)
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screw_and_washer(screw, screw_longer_than(t + thickness + washer_t + nut_t));
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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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fasteners(thickness1);
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translate([0, -kr, kr])
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rotate([-angle, 0, 0])
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translate([0, -kr, - kr])
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rotate(180)
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fasteners(thickness2);
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}
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