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80 lines
2.9 KiB
OpenSCAD
80 lines
2.9 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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//! A method of making 3D printed holes come out the right size regardless of the printer, providing
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//! it gets the linear dimensions right. See <https://hydraraptor.blogspot.com/2011/02/polyholes.html>
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//!
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//! The module provides `poly_circle()`, `poly_cylinder()` and `poly_ring()` that is useful for making printed washers and pillars.
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//
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function sides(r) = max(round(4 * r), 3); //! Optimium number of sides for specified radius
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function corrected_radius(r, n = 0) = r / cos(180 / (n ? n : sides(r))); //! Adjusted radius to make flats lie on the circle
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function corrected_diameter(d, n = 0) = d / cos(180 / (n ? n : sides(d / 2))); //! Adjusted diameter to make flats lie on the circle
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module poly_circle(r, sides = 0) { //! Make a circle adjusted to print the correct size
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n = sides ? sides : sides(r);
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circle(r = corrected_radius(r,n), $fn = n);
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}
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module poly_cylinder(r, h, center = false, sides = 0) //! Make a cylinder adjusted to print the correct size
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extrude_if(h, center)
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poly_circle(r, sides);
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module poly_ring(or, ir) { //! Make a 2D ring adjusted to have the correct internal radius
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cir = corrected_radius(ir);
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filaments = (or - cir) / extrusion_width;
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if(filaments > 3 + eps)
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difference() {
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circle(or);
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poly_circle(ir);
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}
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else
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if(filaments >= 2)
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difference() {
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offset(or - cir)
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poly_circle(ir);
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poly_circle(ir);
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}
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else
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difference() {
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poly_circle(or);
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offset(-squeezed_wall)
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poly_circle(or);
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}
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}
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module drill(r, h = 100) //! Make a cylinder for drilling holes suitable for CNC routing, set h = 0 for circle
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extrude_if(h)
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circle(r = corrected_radius(r, r2sides(r)));
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//
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// Horizontal slot
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//
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module slot(r, l, h = 100) //! Make a horizontal slot suitable for CNC routing, set h = 0 for 2D version
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extrude_if(h)
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hull() {
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translate([l / 2,0])
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drill(r, 0);
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translate([-l / 2,0])
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drill(r, 0);
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}
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