Added kingpins and got them in the right places!
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3 changed files with 76 additions and 28 deletions
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@ -16,5 +16,5 @@ translate([-900,0,130])
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suspension();
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translate([1100,0,130])
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suspension();
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suspension(cst=0);
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@ -23,6 +23,39 @@ lug_thickness = stock_section/6;
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// radius of suspension pivots
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pivot_radius = stock_section/3; //for now
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// aft tilt of kingpins in degrees from vertical
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caster_angle = 7;
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// inward tilt of the kingpins in degrees from vertical
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// TODO: should be calculated from hub width and wheel radius?
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camber_angle = 10;
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module kingpin( h = 300, r = 12.5,
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cmb = camber_angle, cst = caster_angle,
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al = 100) {
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kl = h * (1/cos(90 - cmb)) * (1/cos(90 - cst));
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// kingpin itself
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rotate([cmb, cst, 0])
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cylinder( h=h, r=r, center=true);
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// stub axle
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// axle offset as a fraction of the lenth of the kingpin
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aof = 0.35 * h;
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camber_offset = aof/tan(90-cmb);
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caster_offset = 0 - aof/tan(90-cst);
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translate([caster_offset, al + camber_offset, 0-aof])
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rotate([ 90, 0, 0])
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cylinder( h=al, r=r);
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translate([caster_offset, al, 0-aof])
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wheel();
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}
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module lug() {
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difference() {
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union() {
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@ -38,7 +71,7 @@ module lug() {
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}
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}
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module wishbone(l, w, is_upper = true) {
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module wishbone(l, w, skew = 0, is_upper = true) {
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ssd2 = stock_section/2;
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ssm2 = stock_section * 2;
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ssm3 = stock_section * 3;
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@ -72,20 +105,23 @@ module wishbone(l, w, is_upper = true) {
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union() {
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intersection(){
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linear_extrude(stock_section)
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polygon( points=[[0-(l/2), ssd2], [l/2, ssd2],
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[3*ssd2, w-(3*ssd2)],
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[0-(3*ssd2), w-(3*ssd2)],
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polygon( points=[[0-(l/2), ssd2],
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[l/2, ssd2],
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[skew + (3*ssd2), w-(3*ssd2)],
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[skew -(3*ssd2), w-(3*ssd2)],
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// hole in the middle
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[0-(l/2 - 3*ssd2), 3*ssd2],
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[l/2 - 3*ssd2, 3*ssd2],
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[ssd2, w-(5*ssd2)], [0-ssd2, w-(5*ssd2)]],
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paths=[[0, 1, 2, 3], [4, 5, 6, 7]]);
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[(0 - (l/2 - 3*ssd2)), 3*ssd2],
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[(l/2 - 3*ssd2), 3*ssd2],
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[skew + ssd2, w-(5*ssd2)],
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[skew - ssd2, w-(5*ssd2)]],
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paths=[[0, 1, 2, 3], [4, 5, 6, 7]
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]);
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translate([0 - (l - ssd2)/2, 0, 0 - stock_section])
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cube([l-ssd2, w, ssm3]);
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}
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translate([-3*ssd2, w-3*ssd2, 0])
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translate([skew-3*ssd2, w-3*ssd2, 0])
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cube( [stock_section, 3*ssd2, stock_section]);
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translate([ssd2, w-3*ssd2, 0])
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translate([skew+ssd2, w-3*ssd2, 0])
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cube( [stock_section, 3*ssd2, stock_section]);
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};
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color("darkgray")
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@ -93,10 +129,9 @@ module wishbone(l, w, is_upper = true) {
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rotate([0, 90, 0])
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cylinder(h=l, r=pivot_radius, center=true);
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color("darkgray")
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translate([0, w - ssd2, ssd2])
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translate([skew, w - ssd2, ssd2])
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rotate([0, 90, 0])
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cylinder(h=ssm3, r=pivot_radius, center=true);
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}
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module subframe(l, w, h) {
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@ -111,17 +146,22 @@ module wishbone(l, w, is_upper = true) {
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}
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module suspension( l = 300, w = 300, h = 300,
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track = 1400, hub_width = 135, wheel_diameter=600) {
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track = 1400, hub_width = 135, wheel_diameter=600,
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cmb=camber_angle, cst=caster_angle) {
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subframe(l,w,h);
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wishbone_length = 500; // TODO: calculate
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camber_offset = h/tan(90-cmb);
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caster_offset = h/tan(90-cst);
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// Upper wishbones
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translate([0, w/2, (h/2) - stock_section])
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wishbone( l, wishbone_length);
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wishbone( l, wishbone_length - camber_offset, caster_offset);
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mirror([0,1, 0]) {
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translate([0, w/2, (h/2) - stock_section])
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wishbone( l, wishbone_length);
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wishbone( l, wishbone_length - camber_offset, caster_offset);
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}
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shock_extent = wishbone_length - (5.5 * stock_section);
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@ -130,25 +170,28 @@ module suspension( l = 300, w = 300, h = 300,
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// lower wishbones
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translate([0, w/2, 0 -(h/2)]) {
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wishbone( l, wishbone_length, false);
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translate([0, wishbone_length + 75, stock_section])
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wheel();
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wishbone( l, wishbone_length, 0, false);
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translate([0, (stock_section*2), h-(stock_section/2)])
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rotate([shock_angle +180, 0, 0])
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shockabsorber(length=shock_length,eid=stock_section/2);
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}
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mirror([0,1, 0]) {
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translate([0, w/2, 0 -(h/2)]) {
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wishbone( l, wishbone_length, false);
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translate([0, wishbone_length + 75, stock_section])
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wheel();
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wishbone( l, wishbone_length, 0, false);
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translate([0, (stock_section*2), h-(stock_section/2)])
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rotate([shock_angle +180, 0, 0])
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shockabsorber(length=shock_length,
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eid=stock_section/2);
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}
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}
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translate([caster_offset/2,
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wishbone_length + (stock_section * 4), 0])
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kingpin(cst=cst);
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mirror([0,1, 0])
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translate([caster_offset/2,
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wishbone_length + (stock_section * 4), 0])
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kingpin(cst=cst);
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}
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// suspension();
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@ -105,7 +105,12 @@ module front_bulkhead() {
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cube([sheet_thickness, floor_width, e]);
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}
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module rear_bulkhead() {
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module rear_bulkhead(fl=floor_length, fw = floor_width,
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st = sheet_thickness, la = layback_angle_r,
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msh = sill_max_height) {
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translate([ (fl/2) + (msh/(2*sin(la))), 0, msh/2])
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rotate([0, la, 0])
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cube([st, fw, msh * 1/cos(la)], center=true);
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}
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module tub(fl=floor_length, fw=floor_width, st=sheet_thickness,
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@ -124,7 +129,7 @@ module tub(fl=floor_length, fw=floor_width, st=sheet_thickness,
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front_bulkhead();
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rear_bulkhead();
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rear_bulkhead(fl = fl, fw = fw, st = st);
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}
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// tub();
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