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Improved sparse_strut3d() structure.

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Revar Desmera 2018-11-21 11:34:32 -08:00
parent 5bd5fb894f
commit 05d073f071
1 changed files with 31 additions and 23 deletions
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54
shapes.scad
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@ -195,7 +195,6 @@ module chamferred_cylinder(h=1, r=1, d=undef, chamfer=0.25, chamfedge=undef, ang
x = (chamfedge == undef)? chamfer : (chamfedge * sin(angle));
y = (chamfedge == undef)? chamfer*sin(90-angle)/sin(angle) : (chamfedge * sin(90-angle));
rad = (d == undef)? r : (d / 2.0);
echo(rad);
up(center? 0 : h/2) {
rotate_extrude(angle=360, convexity=2) {
polygon(
@ -810,7 +809,8 @@ module thinning_brace(h=50, l=100, thick=5, ang=30, strut=5, wall=3)
// max_bridge = maximum bridging distance between cross-braces.
// strut = the width of the cross-braces.
// Example:
// sparse_strut3d(h=40, w=40, l=120, thick=4, maxang=30, strut=5, max_bridge=20);
// sparse_strut3d(h=100, w=33, l=33, thick=3, strut=3, maxang=30, max_bridge=20);
// sparse_strut3d(h=40, w=40, l=120, thick=3, maxang=30, strut=3, max_bridge=20);
module sparse_strut3d(h=50, l=100, w=50, thick=3, maxang=40, strut=3, max_bridge = 20)
{
@ -820,41 +820,49 @@ module sparse_strut3d(h=50, l=100, w=50, thick=3, maxang=40, strut=3, max_bridge
xreps = ceil(xoff/yoff);
yreps = ceil(yoff/xoff);
zreps = ceil(zoff/min(xoff, yoff));
xstep = xoff / xreps;
ystep = yoff / yreps;
zstep = zoff / zreps;
cross_ang = atan2(xstep, ystep);
cross_len = hypot(xstep, ystep);
supp_ang = min(maxang, min(atan2(max_bridge, zstep), atan2(cross_len/2, zstep)));
supp_reps = floor(cross_len/2/(zstep*sin(supp_ang)));
supp_step = cross_len/2/supp_reps;
union() {
if(xreps>1) {
yspread(yoff) {
xspread(xstep, n=xreps-1) {
cube(size=[thick, thick, h], center=true);
}
}
}
if(yreps>1) {
xspread(xoff) {
yspread(ystep, n=yreps-1) {
cube(size=[thick, thick, h], center=true);
}
}
}
xspread(xoff) sparse_strut(h=h, l=l, thick=thick, maxang=maxang, strut=strut, max_bridge=max_bridge);
ybridge = (l - (yreps+1) * strut) / yreps;
xspread(xoff) sparse_strut(h=h, l=l, thick=thick, maxang=maxang, strut=strut, max_bridge=ybridge/ceil(ybridge/max_bridge));
yspread(yoff) zrot(90) sparse_strut(h=h, l=w, thick=thick, maxang=maxang, strut=strut, max_bridge=max_bridge);
for(xs = [0:xreps-1]) {
for(ys = [0:yreps-1]) {
translate([(xs+0.5)*xstep-xoff/2, (ys+0.5)*ystep-yoff/2, 0]) {
zrot( cross_ang) sparse_strut(h=h, l=cross_len, thick=thick, maxang=maxang, strut=strut, max_bridge=max_bridge);
zrot(-cross_ang) sparse_strut(h=h, l=cross_len, thick=thick, maxang=maxang, strut=strut, max_bridge=max_bridge);
for(zs = [0:zreps-1]) {
for(xs = [0:xreps-1]) {
for(ys = [0:yreps-1]) {
translate([(xs+0.5)*xstep-xoff/2, (ys+0.5)*ystep-yoff/2, (zs+0.5)*zstep-zoff/2]) {
zflip_copy(offset=-(zstep-strut)/2) {
xflip_copy() {
zrot(cross_ang) {
down(strut/2) cube([strut, cross_len, strut], center=true);
for (soff = [0 : supp_reps-1] ) {
yflip_copy() {
back(soff*supp_step) {
skew_xy(ya=supp_ang) {
upcube([strut, strut, zstep]);
}
}
}
}
}
}
}
}
}
}
}
}
}
//!sparse_strut3d(h=40, w=40, l=120, thick=3, strut=3);
// Makes an open rectangular strut with X-shaped cross-bracing, designed to reduce