84 lines
3.4 KiB
OpenSCAD
84 lines
3.4 KiB
OpenSCAD
//
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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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//! Crude representation of a bulldog clip. The handle is not currently drawn but its length can be
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//! accessed to allow clearance. Used for holding glass on 3D printer beds but Swiss picture clips can be
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//! better.
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//
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include <../core.scad>
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use <../utils/rounded_polygon.scad>
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use <../utils/sector.scad>
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function bulldog_length(type) = type[1]; //! Length along the profile
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function bulldog_depth(type) = type[2]; //! Depth from the back to the front of the tubes
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function bulldog_height(type) = type[3]; //! Height at the back
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function bulldog_thickness(type) = type[4]; //! Thickness of the metal
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function bulldog_tube(type) = type[5] / 2; //! Outside diameter of the tubes
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function bulldog_radius(type) = type[6]; //! Outside radius of the back corners
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function bulldog_handle_length(type) = type[7]; //! Length that the handle protrudes from the back
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module bulldog_shape(depth, height, radius, tube, open) {
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rounded_polygon([
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[-depth / 2 + radius, -height / 2 + radius, radius],
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[-depth / 2 + radius, height / 2 - radius, radius],
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[ depth / 2 - tube, open / 2 + tube, -tube],
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[ depth / 2 + tube, height / 2, tube],
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[ depth / 2 + tube, -height / 2, tube],
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[ depth / 2 - tube, -open / 2 - tube, -tube],
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]);
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}
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module bulldog(type, open = 4) { //! Draw bulldog clip open by specified amount
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tube = bulldog_tube(type);
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thickness = bulldog_thickness(type);
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depth = bulldog_depth(type);
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length = bulldog_length(type);
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height = bulldog_height(type);
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rad = bulldog_radius(type);
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gap = open + thickness * 2;
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vitamin(str("bulldog(", type[0], "): Bulldog clip ",length, "mm"));
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color("yellow")
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translate([depth / 2 - thickness - eps, 0])
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rotate([90, 0, 0])
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linear_extrude(length, center = true)
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union() {
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difference() {
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bulldog_shape(depth, height, rad, tube, gap);
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offset(-thickness)
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bulldog_shape(depth, height, rad, tube, gap);
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translate([depth / 2 - tube, -height])
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square([depth, 2 * height]);
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}
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for(side = [-1, 1])
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translate([depth / 2 - tube, side * (open / 2 + tube)])
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difference() {
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mirror([0, side < 0 ? 1 : 0])
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sector(tube, -90, 210);
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circle(tube - thickness);
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}
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}
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}
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