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README.md
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README.md
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@ -8,9 +8,11 @@ Design of a highly experimental recumbent tricycle, not software at all.
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Still at a very preliminary, pre-prototype stage. Work is documented [here](https://www.journeyman.cc/blog/tags-output/Tricycle/).
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## Dependencies
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## Copyright
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The following libraries are used into this model. They should be downloaded and installed into your [OpenSCAD library directory](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries), which on Linux systems is usually `$HOME/.local/share/OpenSCAD/libraries`.
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Copyright © Simon Brooke, 2024-2025; may be used and modified under [Creative Commons Attribution-Share Alike](https://creativecommons.org/licenses/by-sa/4.0/deed.en) licence.
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#### Parts of the following libraries are incorporated into this model
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| Library | Referenced as | Author | Licence |
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| ------------------------------------------------------------ | ------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ |
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@ -22,6 +24,4 @@ The following libraries are used into this model. They should be downloaded and
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## Copyright
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Copyright © Simon Brooke, 2024-2025; may be used and modified under [Creative Commons Attribution-Share Alike](https://creativecommons.org/licenses/by-sa/4.0/deed.en) licence.
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but (currently) uses elements from's [BentSim](https://github.com/PRouzeau/BentSim) project, which is [GPL](https://github.com/PRouzeau/BentSim/blob/master/LICENSE) licensed, and sprockets from s, which is licensed under .
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@ -3,16 +3,17 @@
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// (c) Simon Brooke 2025; CC-BY-SA
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// Derived from Hampus Andersson's Sprocket Generator
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include <SprocketGenerator2/files/Sprocket_Generator_v2_example_10.scad>
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include <BOSL2/std.scad>
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include <pedal.scad>
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function sprocket_radius(teeth=52, roller=7.9, pitch=12.7) =
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let(roller_radius = roller/2,
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function sprocket_radius(teeth=52, roller=7.9, pitch=12.7) = let(roller_radius = roller/2,
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radius = pitch/(2*sin(180/teeth)))
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sqrt((radius*radius) - (pitch*(roller_radius+tolerance))+((roller_radius+tolerance)*(roller_radius+tolerance)));
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module chainring( teeth=52, roller=7.9, pitch=12.7) {
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radius = sprocket_radius(teeth=teeth, roller=roller, pitch=pitch);
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@ -35,14 +36,6 @@ module spider(radius, arms) {
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}
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/**
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* parameterised chainset with, currently, only one chainring; and,
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* currently, derailleur-sized chain. Parameters are:
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* `teeth`: the number of teeth, obviously;
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* `arms`: the number of arms on the spider;
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* `crank`: the length of the crank, in millimetres;
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* `bbshell`: the width of the bottom bracket shell, in millimetres.
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*/
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module chainset(teeth=53, arms=5, crank=172, bbshell=68) {
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radius = sprocket_radius(teeth=teeth);
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@ -61,9 +54,9 @@ module chainset(teeth=53, arms=5, crank=172, bbshell=68) {
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prismoid(size1=[10, 25], size2=[7, 18], h=crank +20);
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// pedals
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translate([0-crank, 0, 8+bbshell])
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translate([0-crank, 0, 20 + bbshell])
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pedal();
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translate([crank, 0, 0-2])
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translate([crank, 0, 0-4])
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mirror([0, 0, 1])
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pedal();
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@ -80,4 +73,4 @@ module chainset(teeth=53, arms=5, crank=172, bbshell=68) {
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// chainring();
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// spider(90, 1);
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// chainset(teeth=82, crank=140);
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chainset(teeth=82, crank=140);
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@ -3,7 +3,7 @@
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// (c) Simon Brooke 2025; CC-BY-SA
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include <BentSim/Library/Bike_accessories.scad>
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include <BentSim/Bike_accessories.scad>
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include <NACAAirfoils/files/Naca4.scad>
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include <library/skew.scad>
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@ -1,43 +0,0 @@
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/* Taken from https://gist.github.com/boredzo/fde487c724a40a26fa9c?permalink_comment_id=4258747 */
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/* skew takes an array of six angles:
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* x along y
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* x along z
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* y along x
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* y along z
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* z along x
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* z along y
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*/
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module skew(dims) {
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matrix = [
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[ 1, dims[0]/45, dims[1]/45, 0 ],
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[ dims[2]/45, 1, dims[4]/45, 0 ],
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[ dims[5]/45, dims[3]/45, 1, 0 ],
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[ 0, 0, 0, 1 ]
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];
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multmatrix(matrix)
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children();
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}
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/* example:
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* skew([45, 0, 0, 0, 0, 0])
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* cube([10,10,10]);
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*/
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// Skews the child geometry.
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// xy: Angle towards X along Y axis.
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// xz: Angle towards X along Z axis.
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// yx: Angle towards Y along X axis.
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// yz: Angle towards Y along Z axis.
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// zx: Angle towards Z along X axis.
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// zy: Angle towards Z along Y axis.
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module skew2(xy = 0, xz = 0, yx = 0, yz = 0, zx = 0, zy = 0) {
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matrix = [
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[ 1, tan(xy), tan(xz), 0 ],
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[ tan(yx), 1, tan(yz), 0 ],
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[ tan(zx), tan(zy), 1, 0 ],
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[ 0, 0, 0, 1 ]
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];
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multmatrix(matrix)
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children();
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}
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@ -2,31 +2,15 @@
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// (c) Simon Brooke 2025; CC-BY-SA
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include <BOSL2/std.scad>
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module pedal(){
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color("black")
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intersection() {
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rotate([0, 270, 0])
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scale([.45, .45, .45])
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translate([-20, -160, 0])
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linear_extrude(height = 40, center = true)
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scale([.6, .6, .6])
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translate([-50, -160, 0])
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linear_extrude(height = 10, center = true)
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// color("black")
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import("library/look-keo.svg");
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rotate([0, 90, 90])
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translate([-50, 0, -43])
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prismoid(size1=[60, 25], size2=[60, 5], height=90);
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}
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// axle
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color("black")
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cylinder(h=80, r=7.1);
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translate([0, 0, 8])
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color("black")
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cylinder(h=3, r=9);
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translate([0, 0, 12])
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color("black")
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cylinder(h=12, r1=10, r2=9);
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cylinder(h=80, r=6);
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}
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// pedal();
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@ -12,31 +12,31 @@ include <epicyclic.scad>
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module subframe () {
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// front leg (supports cross-shaft, epicyclic, motor
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translate([-25, 1820, -550])
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color("silver")
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color("grey")
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cube([50, 25, 230]);
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// bottom bracket leg
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translate([-25, 1690, -578])
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color("silver")
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color("grey")
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cube([50, 25, 310]);
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// wheel leg
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translate([-70, 1430, -593])
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rotate([0, 5, 0])
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color("silver")
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color("grey")
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cube([25, 75, 363]);
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// front upper
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translate([-25, 2000, -385])
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rotate([70, 0, 0])
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color("silver")
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color("grey")
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cube([50, 25, 330]);
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// central upper
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translate([-25, 1700, -275])
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rotate([82, 0, 0])
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color("silver")
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color("grey")
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cube([50, 25, 370]);
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// rear leg
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translate([-25, 1200, -515])
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rotate([-23, 0, 0])
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color("silver")
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color("grey")
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cube([50, 25, 344]);
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// wheel
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@ -46,12 +46,6 @@ module subframe () {
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scale([0.70, 0.70, 0.70])
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wheel(rim=451, spoke_nbr=0);
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translate([-30, 1467.5, -450])
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rotate([0, 90, 0])
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color("grey")
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sprocket(teeth=30, roller=7.9, pitch=12.7);
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rotate([90, 0, 90])
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translate([1680, -410, -40])
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chainset( teeth=82, crank=140);
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