Moved the lower knuckle out into its own file, and substantially improved it.
I'm still having problems with fudge factors which I need to resolve; I need to learn more about filletting, rounding, radiusing and fairing.
This commit is contained in:
parent
0a3c553512
commit
35376827d1
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@ -5,6 +5,7 @@
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include <BOSL2/std.scad>
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include <BOSL2/std.scad>
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include <NACAAirfoils/files/Naca4.scad>
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include <NACAAirfoils/files/Naca4.scad>
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include <library/skew.scad>
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include <library/skew.scad>
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include <lowerknuckle.scad>
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include <wheel.scad>
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include <wheel.scad>
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$fn=64;
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$fn=64;
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@ -48,64 +49,6 @@ module fourbar_leg(length=1000, chord=100, lat_skew=35, long_skew=30) {
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}
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}
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module lower_bar_end_knuckle(chord=100, pivot_radius=12, rise=8,lat_skew=30) {
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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 * 2.75;
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difference() {
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union () {
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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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cyl(h=l_body, r=w_body/2, rounding=5);
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// 'except=TOP' in phrase introduces the spurious hulls
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translate([l_body/2, w_body/2, h_axis*.75])
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cuboid([l_body, w_body, h_axis * .75], rounding=5);
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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 * 0.25, w_body/2, 0])
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rotate([90, 0, 0])
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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 * 0.25, w_body/2, -3])
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rotate([80, 0, 90])
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prismoid([w_body, 45], [w_body, 10], rounding=5, h=l_body * .75);
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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 * 1.3);
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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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// through hole for wheel axle
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translate([ chord * 0.25, 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, 30])
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rotate([90 + rise, 360 - lat_skew, 0])
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airfoil(h=chord, L=2 - chord);
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// // brake disk
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), 1])
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// rotate([90, 0, 0])
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// color("silver")
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// cylinder( h=1.5, r=75);
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// // wheel (obviously)
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), -10])
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// wheel();
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}
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module fourbar_axle_half( length=1000, chord=100, lat_skew=35, long_skew=30, shoulder=650) {
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module fourbar_axle_half( length=1000, chord=100, lat_skew=35, long_skew=30, shoulder=650) {
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rise=8;
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rise=8;
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@ -127,6 +70,16 @@ module fourbar_axle_half( length=1000, chord=100, lat_skew=35, long_skew=30, sho
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rotate([0, long_skew, 0])
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rotate([0, long_skew, 0])
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translate([(0 - (chord*1.25)), (l_hlb * cos(rise) + 72), -62])
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translate([(0 - (chord*1.25)), (l_hlb * cos(rise) + 72), -62])
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lower_bar_end_knuckle(chord, 12, rise, lat_skew);
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lower_bar_end_knuckle(chord, 12, rise, lat_skew);
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rotate([0, long_skew, 0])
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translate([(0 - (chord*1.25)), (l_hlb * cos(rise) + 155), -62])
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wheel();
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rotate([0, long_skew, 0])
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translate([(0 - (chord*1.25)), (l_hlb * cos(rise) + 115), -62])
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rotate([90, 0, 0])
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color("silver")
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cylinder( h=1.5, r=75);
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}
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}
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@ -145,15 +98,6 @@ module fourbar(length=1000, chord=100, lat_skew=30, long_skew=30, shoulder=650)
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fourbar_axle_half(length, chord, lat_skew, long_skew, shoulder);
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fourbar_axle_half(length, chord, lat_skew, long_skew, shoulder);
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}
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}
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translate([-125, 0, 0])
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color("blue")
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lower_bar_end_knuckle();
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translate([-100, 74, 0])
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wheel();
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translate([-100, 34, 0])
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color("silver")
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rotate([90, 0, 0])
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cylinder(h=1.5, r=75);
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// fourbar(length=1000, chord=100, long_skew=30, lat_skew=35, shoulder=650);
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// fourbar(length=1000, chord=100, long_skew=30, lat_skew=35, shoulder=650);
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// fourbar_axle_half(1000,100, 30);
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// fourbar_axle_half();
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144
model/lowerknuckle.scad
Normal file
144
model/lowerknuckle.scad
Normal file
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@ -0,0 +1,144 @@
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// lowerknuckle.scad
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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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$fn=64;
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module lower_bar_end_knuckle_old(chord=100, pivot_radius=12, rise=8,lat_skew=30) {
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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 * 2.75;
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difference() {
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union () {
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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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cyl(h=l_body, r=w_body/2, rounding=5);
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// 'except=TOP' in phrase introduces the spurious hulls
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translate([l_body/2, w_body/2, h_axis*.75])
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cuboid([l_body, w_body, h_axis * .75], rounding=5);
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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 * 0.25, w_body/2, 0])
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rotate([90, 0, 0])
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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 * 0.25, w_body/2, -3])
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rotate([80, 0, 90])
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prismoid([w_body, 45], [w_body, 10], rounding=5, h=l_body * .75);
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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 * 1.3);
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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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// through hole for wheel axle
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translate([ chord * 0.25, 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, 30])
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rotate([90 + rise, 360 - lat_skew, 0])
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airfoil(h=chord, L=2 - chord);
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// // brake disk
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), 1])
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// rotate([90, 0, 0])
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// color("silver")
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// cylinder( h=1.5, r=75);
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// // wheel (obviously)
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), -10])
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// wheel();
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}
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module lower_bar_end_knuckle(chord=100, pivot_radius=12, rise=8,lat_skew=30, colour="blue") {
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l_body=chord * 2;
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w_body=pivot_radius * 2.5;
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h_axis=pivot_radius * 2.75;
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difference() {
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union () {
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// (more streamlined) body
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translate([160, w_body/2, -22])
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rotate([0,0,180])
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scale([1, 2, 1])
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color( colour)
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airfoil(h=70, L=l_body);
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// boss for wheel axle
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translate([ chord * 0.25, w_body * 0.9, 0])
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rotate([90, 0, 0])
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color( colour)
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cyl(h=w_body * 1.25, r=20, rounding=5);
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}
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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 * 1.3);
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// space for the airfoil leg to emerge
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translate([ chord*0.25, w_body*.75, pivot_radius * 2.25])
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rotate([lat_skew + 45, 0, 0])
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cube([chord, pivot_radius * 4, pivot_radius * 4]);
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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=250, r=pivot_radius/3);
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// through hole for wheel axle
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translate([ chord * 0.25, w_body *1.5, 0])
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rotate([90, 0, 0])
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cylinder(h=w_body * 1.4, r=12.5);
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// slice off the front bottom
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translate([chord * 1.25, w_body/2, 0 - w_body])
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rotate([270-lat_skew, 0, 90])
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color( colour)
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cuboid([2* w_body, 2*w_body, l_body *.75]);
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// slice off the upper back
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translate([0, w_body/2, w_body * 2.5])
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rotate([270-lat_skew, 0, 90])
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color( colour)
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cuboid([2* w_body, 2*w_body, l_body *.75]);
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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, 30])
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rotate([90 + rise, 360 - lat_skew, 0])
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color( colour)
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airfoil(h=chord, L=2 - chord);
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// // brake disk
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), 1])
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// rotate([90, 0, 0])
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// color("silver")
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// cylinder( h=1.5, r=75);
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// // wheel (obviously)
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// translate([(0 - (chord*1.25)), (l_hlb * cos(rise)), -10])
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// wheel();
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}
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//translate([-125, 0, 0])
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// lower_bar_end_knuckle();
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//translate([-125, 0, 125])
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// color("blue")
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// lower_bar_end_knuckle();
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//translate([-100, 74, 0])
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// wheel();
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@ -11,7 +11,7 @@ include <hull.scad>
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rotate([0, 0, 270])
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rotate([0, 0, 270])
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translate([0, 1300, 180])
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translate([0, 1300, 180])
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subframe(structure="carbon");
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subframe(structure="carbon");
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translate([0, 0, 320])
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translate([0, 0, 250])
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fourbar(length=1000, chord=100, long_skew=30, lat_skew=35, shoulder=650);
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fourbar(length=1000, chord=100, long_skew=30, lat_skew=35, shoulder=650);
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translate([800, 0, 120])
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translate([800, 0, 120])
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