78 lines
2.6 KiB
OpenSCAD
78 lines
2.6 KiB
OpenSCAD
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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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//! Knob with embedded hex head screw.
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//
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include <core.scad>
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include <vitamins/screws.scad>
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use <utils/hanging_hole.scad>
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knob_wall = 2;
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function knob_nut_trap_depth(screw) = round_to_layer(screw_head_height(screw));
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knob_stem_h = 6;
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knob_thickness = 4;
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knob_r = 8;
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knob_wave = 1;
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knob_waves = 9;
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knob_height = knob_stem_h + knob_thickness;
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function knob_height() = knob_height;
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module screw_knob(screw) { //! Generate the STL foe a knob to fit the specified hex screw
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stl(str("screw_knob_M", screw_radius(screw) * 20));
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knob_stem_r = nut_trap_radius(screw_nut(screw)) + knob_wall;
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function wave(a) = knob_r + sin(a * knob_waves) * knob_wave;
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union() {
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render() difference() {
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cylinder(r = knob_stem_r, h = knob_thickness + knob_stem_h);
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hanging_hole(knob_nut_trap_depth(screw), screw_clearance_radius(screw))
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rotate(45)
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circle(r = nut_trap_radius(screw_nut(screw)), $fn = 6);
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}
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linear_extrude(height = knob_thickness, convexity = 3)
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difference() {
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polygon(points = [for(a = [0 : 359]) [wave(a) * sin(a), wave(a) * cos(a)]]);
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circle(knob_stem_r - eps);
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}
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}
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}
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//! Place the screw through the printed part
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module screw_knob_assembly(screw, length) //! Assembly with the screw in place
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assembly(str("screw_knob_M", 20 * screw_radius(screw), "_", length)) {
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translate_z(knob_height)
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vflip()
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color(pp1_colour) screw_knob(screw);
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translate_z(knob_height - knob_nut_trap_depth(screw))
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rotate(-45)
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screw(screw, length);
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}
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module screw_knob_M30_stl() screw_knob(M3_hex_screw);
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module screw_knob_M40_stl() screw_knob(M4_hex_screw);
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module screw_knob_M30_16_assembly() screw_knob_assembly(M3_hex_screw, 16);
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module screw_knob_M40_16_assembly() screw_knob_assembly(M4_hex_screw, 16);
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