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71 lines
2.8 KiB
OpenSCAD
71 lines
2.8 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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//! LMnUU linear bearings.
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//
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include <../utils/core/core.scad>
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use <../utils/tube.scad>
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bearing_colour = grey(70);
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groove_colour = grey(60);
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seal_colour = grey(30);
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function bearing_length(type) = type[1]; //! Total length
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function bearing_dia(type) = type[2]; //! Outside diameter
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function bearing_rod_dia(type) = type[3]; //! Internal diameter
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function bearing_groove_length(type) = type[4]; //! Groove length
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function bearing_groove_dia(type) = type[5]; //! Groove diameter
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function bearing_groove_spacing(type) = type[6]; //! Spacing between grooves, outer to outer, ie includes the grooves themselves
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function bearing_radius(type) = bearing_dia(type) / 2; //! Outside radius
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module linear_bearing(type) { //! Draw specified linear bearing
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vitamin(str("linear_bearing(", type[0], "): Linear bearing ", type[0]));
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casing_t = bearing_radius(type) / 10;
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casing_ir = bearing_radius(type) - casing_t;
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length = bearing_length(type);
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or = bearing_radius(type);
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gl = bearing_groove_length(type);
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gr = bearing_groove_dia(type) / 2;
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gs = bearing_groove_spacing(type);
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offset = (length-gs)/2;
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if(gs==0) {
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color(bearing_colour) tube(or = or, ir = casing_ir, h = length);
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} else {
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translate_z(-length/2) {
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color(bearing_colour) tube(or = or, ir = casing_ir, h = offset, center = false);
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color(groove_colour) translate_z(offset) tube(or = gr, ir = casing_ir, h = gl,center = false);
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color(bearing_colour) translate_z(offset+gl) tube(or = or, ir = casing_ir, h = gs-2*gl, center = false);
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color(groove_colour) translate_z(offset+gs-gl) tube(or = gr, ir = casing_ir, h = gl, center = false);
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color(bearing_colour) translate_z(offset+gs) tube(or = or, ir = casing_ir, h = offset, center = false);
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}
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}
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rod_r = bearing_rod_dia(type) / 2;
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color(seal_colour)
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tube(or = casing_ir, ir = rod_r + eps, h = length - 0.5);
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color(seal_colour * 0.8)
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tube(or = rod_r * 1.12, ir = rod_r, h = length);
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}
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