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Code Issues Releases Wiki Activity

Removed 3D difference for speed.

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Chris
2023-07-22 16:35:50 +01:00
parent 84d98a1081
commit 62b1511c82
1 changed files with 26 additions and 34 deletions
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60
vitamins/linear_bearing.scad
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@@ -23,6 +23,7 @@
include <../utils/core/core.scad>
use <../utils/tube.scad>
use <../utils/sector.scad>
bearing_colour = grey(70);
groove_colour = grey(60);
@@ -54,43 +55,34 @@ module linear_bearing(type) { //! Draw specified linear bearing
gs = bearing_groove_spacing(type);
offset = (length-gs)/2;
difference() {
union() {
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);
module cut_tube(or, ir, h, center = true)
linear_extrude(h, center = center, convexity = 5)
difference() {
ring(or = or, ir = ir);
// Open bearing
if (!is_undef(type[7])) {
theta = open_bearing_theta(type);
sector(or + 1, 180 - theta / 2, 180 + theta / 2);
}
}
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);
}
// Open bearing
if (!is_undef(type[7])) {
rod_r = bearing_rod_dia(type) / 2;
theta = open_bearing_theta(type);
w = open_bearing_width(type) / 2;
h = (w / tan(theta/2));
// calculate the midpoint of the width
mp = w / tan(asin(w / rod_r));
color(groove_colour)
translate([-(h*3) +(h-mp),0,0]) {
mirror([0,1,0])
right_triangle(h*3, w*3, length + 5);
right_triangle(h*3, w*3, length + 5);
}
if(gs==0) {
color(bearing_colour) tube(or = or, ir = casing_ir, h = length);
} else {
translate_z(-length/2) {
color(bearing_colour) cut_tube(or = or, ir = casing_ir, h = offset, center = false);
color(groove_colour) translate_z(offset) cut_tube(or = gr, ir = casing_ir, h = gl,center = false);
color(bearing_colour) translate_z(offset+gl) cut_tube(or = or, ir = casing_ir, h = gs-2*gl, center = false);
color(groove_colour) translate_z(offset+gs-gl) cut_tube(or = gr, ir = casing_ir, h = gl, center = false);
color(bearing_colour) translate_z(offset+gs) cut_tube(or = or, ir = casing_ir, h = offset, center = false);
}
}
rod_r = bearing_rod_dia(type) / 2;
color(seal_colour)
cut_tube(or = casing_ir, ir = rod_r + eps, h = length - 0.5);
color(seal_colour * 0.8)
cut_tube(or = rod_r * 1.12, ir = rod_r, h = length);
}