NopSCADlib/vitamins/linear_bearing.scad

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//
// NopSCADlib Copyright Chris Palmer 2018
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! LMnUU linear bearings.
//
include <../utils/core/core.scad>
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use <../utils/tube.scad>
bearing_colour = grey(70);
groove_colour = grey(60);
seal_colour = grey(30);
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function bearing_length(type) = type[1]; //! Total length
function bearing_dia(type) = type[2]; //! Outside diameter
function bearing_rod_dia(type) = type[3]; //! Internal diameter
function bearing_groove_length(type) = type[4]; //! Groove length
function bearing_groove_dia(type) = type[5]; //! Groove diameter
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
module linear_bearing(type) { //! Draw specified linear bearing
vitamin(str("linear_bearing(", type[0], "): Linear bearing ", type[0]));
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casing_t = bearing_radius(type) / 10;
casing_ir = bearing_radius(type) - casing_t;
length = bearing_length(type);
or = bearing_radius(type);
gl = bearing_groove_length(type);
gr = bearing_groove_dia(type) / 2;
gs = bearing_groove_spacing(type);
offset = (length-gs)/2;
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if(gs==0) {
color(bearing_colour) tube(or = or, ir = casing_ir, h = length);
} else {
translate_z(-length/2) {
color(bearing_colour) tube(or = or, ir = casing_ir, h = offset, center = false);
color(groove_colour) translate_z(offset) tube(or = gr, ir = casing_ir, h = gl,center = false);
color(bearing_colour) translate_z(offset+gl) tube(or = or, ir = casing_ir, h = gs-2*gl, center = false);
color(groove_colour) translate_z(offset+gs-gl) tube(or = gr, ir = casing_ir, h = gl, center = false);
color(bearing_colour) translate_z(offset+gs) tube(or = or, ir = casing_ir, h = offset, center = false);
}
}
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rod_r = bearing_rod_dia(type) / 2;
color(seal_colour)
tube(or = casing_ir, ir = rod_r + eps, h = length - 0.5);
color(seal_colour * 0.8)
tube(or = rod_r * 1.12, ir = rod_r, h = length);
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}