Much work on the lower knuckle, and I've learned a lot. However, because
I forgot to allow for all the weird skews, this is wrong. It's remediable, but not now!
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@ -2,7 +2,7 @@
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// (c) Simon Brooke 2025; CC-BY-SA
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include <BOSL2/std.scad>
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include <NACAAirfoils/files/Naca4.scad>
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include <library/skew.scad>
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include <wheel.scad>
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@ -34,31 +34,58 @@ module fourbar_leg(length=1000, chord=100, long_skew=30, lat_skew=30) {
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}
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module lower_knuckle(chord=100, pivot_radius=12) {
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module loawer_bar_end_knuckle(chord=100, pivot_radius=12, rise=8) {
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l_body=chord * 1.5;
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w_body=pivot_radius * 2.5;
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h_axis=pivot_radius * 3;
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h_axis=pivot_radius * 2.75;
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difference() {
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union () {
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translate([0, w_body/2, h_axis])
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translate([l_body/2, w_body/2, h_axis])
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rotate([0, 90, 0])
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cylinder(h=l_body, r=w_body/2);
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cube([l_body, w_body, h_axis]);
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translate([chord * 1.25, w_body, 0])
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cyl(h=l_body, r=w_body/2, rounding=5);
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translate([l_body/2, w_body/2, h_axis/2])
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cuboid([l_body, w_body, h_axis], rounding=5, except=TOP);
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// bulge for wheel axle; the fork insertion end of
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// a lefty axle is 25mm diameter
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translate([chord * 1.25, w_body/2, 0])
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rotate([90, 0, 0])
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cylinder(h=w_body, r=pivot_radius * 2);
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cyl(h=w_body, r=25, rounding=5);
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// fairing for this
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translate([chord * 1.25, w_body/2, -7.5])
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rotate([80, 0, 270])
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prismoid([w_body, 35], [w_body, 10], rounding=5, h=l_body/2);
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}
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translate([ chord*0.25, -1, pivot_radius * 3])
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cube([chord, pivot_radius * 4, pivot_radius * 4]);
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// scoop for leg-bottom knuckle to rotate within
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translate([ chord*0.25, w_body/2, h_axis])
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rotate([0, 90, 0])
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cylinder(h=chord, r=pivot_radius * 1.5);
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// throough hole for pivot axle
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cylinder(h=chord, r=pivot_radius * 1.3);
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// through hole for pivot axle
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translate([-1, w_body/2, h_axis])
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rotate([0, 90, 0])
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cylinder(h=l_body+2, r=pivot_radius/3);
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cylinder(h=l_body+2, r=pivot_radius/3);
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// through hole for wheel axle
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translate([chord * 1.25, w_body +1, 0])
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rotate([90, 0, 0])
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cylinder(h=w_body-5, r=12.5);
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}
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// airfoil stub to be epoxied into the lower bar of
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// the linkage
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translate([(chord * 1.25) - 1, 5 - chord, 0])
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rotate([90-rise, 0, 180])
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airfoil(h=chord, L=chord-2);
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// root reinforcement for the above
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translate([chord * 1.25, 5 - chord/3, 9])
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rotate([90, 0, 180])
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airfoil(h=chord/3, L=chord);
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translate([(chord * .75), 0, 10])
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rotate([90, 0, 0])
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prismoid([chord -1, 6], [chord -2, 0], h=(chord/3));
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}
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module fourbar_axle_half( length, chord, long_skew) {
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@ -85,7 +112,7 @@ module fourbar_axle_half( length, chord, long_skew) {
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translate([(0 - (chord*1.25)), l_hlb * cos(rise), 30])
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rotate([0, long_skew, 0])
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color("black")
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lower_knuckle(chord, 12);
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loawer_bar_end_knuckle(chord, 12, rise);
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// wheel
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translate([-50, l_hlb + 72, -40])
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@ -121,10 +148,9 @@ module fourbar(length=1000, chord=100, long_skew=30, lat_skew=30, shoulder=650)
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translate([-125, 0, 0])
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color("blue")
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lower_knuckle();
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/* translate([0, 77, 0])
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rotate([270, 0, 0])
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wheel();*/
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loawer_bar_end_knuckle();
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translate([0, 77, 0])
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wheel();
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translate([0, 40, 0])
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color("silver")
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rotate([90, 0, 0])
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@ -20,42 +20,43 @@
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module wheel (iso=451) {
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radius=(iso/2)+7;
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// rim
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color("grey")
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difference() {
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cylinder(h=22, r=radius, center=true);
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translate([0,0, -11])
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cylinder(h=26, r=(radius-10));
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rotate([270, 0, 0]) {
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// rim
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color("grey")
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difference() {
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cylinder(h=22, r=radius, center=true);
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translate([0,0, -11])
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cylinder(h=26, r=(radius-10));
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}
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// carbon cones covering the spokes
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color("black")
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translate([0,0, 4])
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cylinder(h=26.6, r1=radius, r2=22.5);
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color("black")
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mirror([0, 0, -1])
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translate([0,0, 4])
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cylinder(h=14.4, r1=radius, r2=29);
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// tyre
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color("black")
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rotate_extrude(convexity = 10)
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translate([radius +10, 0, 0])
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circle(r = 12, $fn = 100);
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// hub
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color("grey")
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translate([0, 0, -40])
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cylinder(h=65, r=22.5);
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// axle
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color("silver") {
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translate([0, 0, -45])
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cylinder(h=70, r1=12.5, r2=7.5);
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translate([0, 0, -60])
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cylinder(h=25, r=12.5);
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}
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}
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// carbon cones covering the spokes
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color("black")
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translate([0,0, 4])
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cylinder(h=26.6, r1=radius, r2=22.5);
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color("black")
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mirror([0, 0, -1])
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translate([0,0, 4])
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cylinder(h=14.4, r1=radius, r2=29);
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// tyre
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color("black")
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rotate_extrude(convexity = 10)
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translate([radius +10, 0, 0])
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circle(r = 12, $fn = 100);
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// hub
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color("grey")
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translate([0, 0, -40])
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cylinder(h=65, r=22.5);
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// axle
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color("silver") {
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translate([0, 0, -45])
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cylinder(h=70, r1=12.5, r2=7.5);
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translate([0, 0, -85])
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cylinder(h=40, r=12.5);
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}
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}
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// wheel();
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