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Merged thinning_wall() and braced_thinning_wall().
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Revar Desmera
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075172d957
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1 changed files with 131 additions and 154 deletions
107
walls.scad
107
walls.scad
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@ -8,6 +8,7 @@
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// ```
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//////////////////////////////////////////////////////////////////////
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include <BOSL2/paths.scad>
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// Section: Walls
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@ -68,12 +69,13 @@ module narrowing_strut(w=10, l=100, wall=5, ang=30, anchor=BOTTOM, spin=0, orien
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// thinning_wall(h, l, thick, [ang], [strut], [wall]);
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//
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// Arguments:
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// h = height of wall.
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// l = length of wall. If given as a vector of two numbers, specifies bottom and top lengths, respectively.
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// thick = thickness of wall.
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// ang = maximum overhang angle of diagonal brace.
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// strut = the width of the diagonal brace.
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// wall = the thickness of the thinned portion of the wall.
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// h = Height of wall.
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// l = Length of wall. If given as a vector of two numbers, specifies bottom and top lengths, respectively.
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// thick = Thickness of wall.
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// wall = The thickness of the thinned portion of the wall.
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// ang = Maximum overhang angle of diagonal brace.
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// braces = If true, adds diagonal crossbraces for strength.
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// strut = The width of the borders and diagonal braces.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
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// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
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@ -82,31 +84,38 @@ module narrowing_strut(w=10, l=100, wall=5, ang=30, anchor=BOTTOM, spin=0, orien
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// thinning_wall(h=50, l=80, thick=4);
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// Example: Trapezoidal
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// thinning_wall(h=50, l=[80,50], thick=4);
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module thinning_wall(h=50, l=100, thick=5, ang=30, strut=5, wall=2, anchor=CENTER, spin=0, orient=UP)
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module thinning_wall(h=50, l=100, thick=5, ang=30, braces=false, strut=5, wall=2, anchor=CENTER, spin=0, orient=UP)
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{
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l1 = (l[0] == undef)? l : l[0];
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l2 = (l[1] == undef)? l : l[1];
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trap_ang = atan2((l2-l1)/2, h);
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corr1 = 1 + sin(trap_ang);
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corr2 = 1 - sin(trap_ang);
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bevel_h = strut + (thick-wall)/2/tan(ang);
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cp1 = find_circle_2tangents([0,0,h/2], [l2/2,0,h/2], [l1/2,0,-h/2], r=strut)[0];
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cp2 = find_circle_2tangents([0,0,h/2], [l2/2,0,h/2], [l1/2,0,-h/2], r=bevel_h)[0];
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cp3 = find_circle_2tangents([0,0,-h/2], [l1/2,0,-h/2], [l2/2,0,h/2], r=bevel_h)[0];
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cp4 = find_circle_2tangents([0,0,-h/2], [l1/2,0,-h/2], [l2/2,0,h/2], r=strut)[0];
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z1 = h/2;
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z2 = max(0.1, z1 - strut);
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z3 = max(0.05, z2 - (thick-wall)/2*sin(90-ang)/sin(ang));
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z2 = cp1.z;
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z3 = cp2.z;
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x1 = l2/2;
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x2 = max(0.1, x1 - strut*corr1);
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x3 = max(0.05, x2 - (thick-wall)/2*sin(90-ang)/sin(ang)*corr1);
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x2 = cp1.x;
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x3 = cp2.x;
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x4 = l1/2;
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x5 = max(0.1, x4 - strut*corr2);
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x6 = max(0.05, x5 - (thick-wall)/2*sin(90-ang)/sin(ang)*corr2);
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x5 = cp4.x;
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x6 = cp3.x;
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y1 = thick/2;
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y2 = y1 - min(z2-z3, x2-x3) * sin(ang);
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y2 = wall/2;
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corner1 = [ x2, 0, z2];
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corner2 = [-x5, 0, -z2];
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brace_len = norm(corner1-corner2);
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size = [l1, thick, h];
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orient_and_anchor(size, orient, anchor, spin=spin, size2=[l2,thick], chain=true) {
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union() {
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polyhedron(
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points=[
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[-x4, -y1, -z1],
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@ -198,63 +207,31 @@ module thinning_wall(h=50, l=100, thick=5, ang=30, strut=5, wall=2, anchor=CENTE
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],
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convexity=6
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);
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children();
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}
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}
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// Module: braced_thinning_wall()
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//
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// Description:
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// Makes a rectangular wall with cross-bracing, which thins to a smaller width in the center,
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// with angled supports to prevent critical overhangs.
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//
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// Usage:
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// braced_thinning_wall(h, l, thick, [ang], [strut], [wall]);
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//
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// Arguments:
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// h = height of wall.
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// l = length of wall.
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// thick = thickness of wall.
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// ang = maximum overhang angle of diagonal brace.
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// strut = the width of the diagonal brace.
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// wall = the thickness of the thinned portion of the wall.
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// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
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// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
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// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
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//
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// Example:
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// braced_thinning_wall(h=50, l=100, thick=5);
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module braced_thinning_wall(h=50, l=100, thick=5, ang=30, strut=5, wall=2, anchor=CENTER, spin=0, orient=UP)
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{
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dang = atan((h-2*strut)/(l-2*strut));
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dlen = (h-2*strut)/sin(dang);
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size = [l, thick, h];
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orient_and_anchor(size, orient, anchor, spin=spin, chain=true) {
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union() {
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xrot_copies([0, 180]) {
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down(h/2) narrowing_strut(w=thick, l=l, wall=strut, ang=ang);
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fwd(l/2) xrot(-90) narrowing_strut(w=thick, l=h-0.1, wall=strut, ang=ang);
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intersection() {
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cube(size=[thick, l, h], center=true);
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xrot_copies([-dang,dang]) {
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zspread(strut/2) {
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scale([1,1,1.5]) yrot(45) {
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cube(size=[thick/sqrt(2), dlen, thick/sqrt(2)], center=true);
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}
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}
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cube(size=[thick, dlen, strut/2], center=true);
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if(braces) {
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bracepath = [
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[-strut*0.33,thick/2],
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[ strut*0.33,thick/2],
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[ strut*0.33+(thick-wall)/2/tan(ang), wall/2],
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[ strut*0.33+(thick-wall)/2/tan(ang),-wall/2],
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[ strut*0.33,-thick/2],
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[-strut*0.33,-thick/2],
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[-strut*0.33-(thick-wall)/2/tan(ang),-wall/2],
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[-strut*0.33-(thick-wall)/2/tan(ang), wall/2]
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];
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xflip_copy() {
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difference() {
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extrude_from_to(corner1,corner2) {
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polygon(bracepath);
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}
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}
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}
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}
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cube(size=[wall, l-0.1, h-0.1], center=true);
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}
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children();
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}
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}
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// Module: thinning_triangle()
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//
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// Description:
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