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headband v0.4: add chamfering, fix indentation

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user 2024-01-30 20:56:00 +01:00
parent 2bf06487c0
commit 8b9f7e27e5
2 changed files with 130 additions and 38 deletions
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78
chamfer.scad Normal file
View file

@ -0,0 +1,78 @@
/// Chamfering OpenSCAD Example
/// Written by Robert Quattlebaum, 2022-12-14
///
/// This example shows a method for adding a chamfer to a certain
/// class of 3D objects where the profile in the Z dimension doesn't
/// change significantly.
///
/// You must specify the size of the chamfer, the height of the child
/// and the Z-offset for the bottom of the object. You can also specify
/// the shape of the chamfer, which can be either "cone", "curve", "curve-in",
/// or "pyramid".
///
/// This process is ultimately slow, but should be faster than using minkowski.
module chamfer(size=2, child_h=5, child_bot=0, shape="curve") {
chamfer_size=size;
module chamfer_shape() {
if (shape == "cone") {
$fn=16;
cylinder(chamfer_size/2,chamfer_size/2,0);
} else if (shape == "curve") {
$fn=4;
for( y = [0:1/$fn:1]) {
cylinder(chamfer_size/2*(1-y),chamfer_size/2/cos(180/$fn)*y,0);
}
} else if (shape == "curve-in") {
$fn=16;
intersection() {
sphere(chamfer_size/2/cos(180/$fn));
translate([0,0,chamfer_size/2])
cube(chamfer_size, center=true);
}
} else if (shape == "pyramid") {
$fn=4;
cylinder(chamfer_size/2/cos(180/$fn),chamfer_size/2,0);
}
}
module lower_chamfer() {
minkowski()
{
linear_extrude(0.0001) difference() {
square([1000,1000],center=true);
projection()children(0);
}
chamfer_shape();
}
}
module upper_chamfer() {
scale([1,1,-1])lower_chamfer()children();
}
render()difference() {
children();
translate([0,0,child_bot])lower_chamfer()children();
translate([0,0,child_bot+child_h])upper_chamfer()children();
}
}
/////////////////////////////////////////////////////////////////////////
module my_shape(h=5) {
translate([0,0,h/2]) {
difference() {
cube([50,50,h],center=true);
cube([20,20,h+1],center=true);
}
translate([20,21,0])cylinder(h=h,r=20,center=true);
}
}
h=5;
chamfer(3, child_h=h, shape="cone")
my_shape(h);

34
headband.scad
View file

@ -10,7 +10,11 @@ TIP_BEND=20;
RAKE_DEPTH=1;
RAKE_WIDTH=1;
RAKE_STRETCH=1;
RAKE_CHAMPFER=0.5;
RAKE_CHAMFER=0.5;
CHAMFER=1;
CHAMFER_SHAPE="cone";
use <chamfer.scad>
module partial_ring(part, radius, thickness, height) {
rotate(180-180*part, [0, 0, 1])
@ -19,10 +23,13 @@ module partial_ring(part, radius, thickness, height) {
square([thickness, height], center=true);
}
module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, rake_depth=RAKE_DEPTH, rake_width=RAKE_WIDTH, rake_stretch=RAKE_STRETCH, rake_champfer=RAKE_CHAMPFER) {
module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, rake_depth=RAKE_DEPTH, rake_width=RAKE_WIDTH, rake_stretch=RAKE_STRETCH, rake_chamfer=RAKE_CHAMFER, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE) {
union() {
color("purple") partial_ring(part, radius=size, thickness=thickness, height=height);
rotate( 90-180*part, [0, 0, 1]) translate([stretch_len/2, size, 0]) {
chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape) union() {
color("purple")
partial_ring(part, radius=size, thickness=thickness, height=height);
rotate( 90-180*part, [0, 0, 1])
translate([stretch_len/2, size, 0]) {
color("orange") cube([stretch_len, thickness, height], center=true);
color("purple") translate([stretch_len/2, tip_bend, 0])
rotate(90+180*tip_len, [0, 0, 1])
@ -33,9 +40,13 @@ module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part
height=height
);
}
rotate(-90+180*part, [0, 0, 1]) translate([stretch_len/2, -size, 0]) {
color("orange") cube([stretch_len, thickness, height], center=true);
color("purple") scale([1, -1, 1]) translate([stretch_len/2, tip_bend, 0])
rotate(-90+180*part, [0, 0, 1])
translate([stretch_len/2, -size, 0]) {
color("orange")
cube([stretch_len, thickness, height], center=true);
color("purple")
scale([1, -1, 1])
translate([stretch_len/2, tip_bend, 0])
rotate(90+180*tip_len, [0, 0, 1])
partial_ring(
part=tip_len,
@ -44,14 +55,17 @@ module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part
height=height
);
}
}
for (i=[-size/2:size/2]) {
rotate(i*2-rake_width/2, [0, 0, 1]) intersection() {
rotate(i*2-rake_width/2, [0, 0, 1])
intersection() {
scale([1, 1, rake_stretch/(rake_depth/height)])
translate([0, rake_width/2, 0]) rotate_extrude(angle=rake_width)
translate([0, rake_width/2, 0])
rotate_extrude(angle=rake_width)
translate([rake_depth/2-size+thickness/2, 0, 0])
scale([1, 0.5, 1])
circle(r=rake_depth, $fn=3);
translate([rake_depth/2-size+thickness/2-rake_champfer, 0, 0])
translate([rake_depth/2-size+thickness/2-rake_chamfer, 0, 0])
color("red")
cube([2*rake_depth, rake_width, height], center=true);
}