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72 lines
2.7 KiB
OpenSCAD
72 lines
2.7 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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//! Cable zipties.
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//
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include <../utils/core/core.scad>
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use <../utils/rounded_polygon.scad>
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function ziptie_width(type) = type[1]; //! Width
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function ziptie_thickness(type) = type[2]; //! Thickness
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function ziptie_latch(type) = type[3]; //! Latch dimensions
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function ziptie_colour(type) = type[4]; //! Colour
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function ziptie_tail(type) = type[5]; //! The length without teeth
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module ziptie(type, r, t = 0) //! Draw specified ziptie wrapped around radius ```r``` and optionally through panel thickness ```t```
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{
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latch = ziptie_latch(type);
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lx = latch.x / 2;
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zt = ziptie_thickness(type);
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cr = zt; // sharp corner raduus
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z = r + t - cr;
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x = r - cr;
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inside_corners = t ? [ [0, 0, r], [-x, z, cr], [x, z, cr] ] : [];
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outside_corners = t ? [ [0, 0, r + zt], [-x, z, cr + zt], [x, z, cr + zt] ] : [];
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x1 = lx - zt / 2;
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x2 = x1 + x1 * zt / r;
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inside_path = concat([ [0, 0, r], [x1, -r, eps] ], inside_corners);
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outside_path = concat([ [0, 0, r + zt], [x2, -r - zt, eps] ], outside_corners);
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tangents = rounded_polygon_tangents(outside_path);
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length = ceil(rounded_polygon_length(outside_path, tangents) + ziptie_tail(type) + latch.z + 1);
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len = length <= 100 ? 100 : length;
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width = ziptie_width(type);
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vitamin(str("ziptie(", type[0], ", ", r, "): Ziptie ", width, "mm x ", len, "mm min length"));
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color(ziptie_colour(type)){
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linear_extrude(width, center = true)
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difference() {
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rounded_polygon(outside_path, tangents);
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rounded_polygon(inside_path);
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}
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translate([lx, -r])
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rotate([90, 0, 0])
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union() {
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rounded_rectangle(latch, 0.5, center = false);
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translate_z((latch.z + 1) / 2)
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cube([ziptie_thickness(type), ziptie_width(type), latch.z + 1], center = true);
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}
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}
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}
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