headband v0.4: add chamfering, fix indentation #7
78
chamfer.scad
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78
chamfer.scad
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/// Chamfering OpenSCAD Example
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/// Written by Robert Quattlebaum, 2022-12-14
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///
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/// This example shows a method for adding a chamfer to a certain
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/// class of 3D objects where the profile in the Z dimension doesn't
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/// change significantly.
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///
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/// You must specify the size of the chamfer, the height of the child
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/// and the Z-offset for the bottom of the object. You can also specify
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/// the shape of the chamfer, which can be either "cone", "curve", "curve-in",
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/// or "pyramid".
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///
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/// This process is ultimately slow, but should be faster than using minkowski.
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module chamfer(size=2, child_h=5, child_bot=0, shape="curve") {
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chamfer_size=size;
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module chamfer_shape() {
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if (shape == "cone") {
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$fn=16;
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cylinder(chamfer_size/2,chamfer_size/2,0);
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} else if (shape == "curve") {
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$fn=4;
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for( y = [0:1/$fn:1]) {
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cylinder(chamfer_size/2*(1-y),chamfer_size/2/cos(180/$fn)*y,0);
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}
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} else if (shape == "curve-in") {
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$fn=16;
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intersection() {
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sphere(chamfer_size/2/cos(180/$fn));
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translate([0,0,chamfer_size/2])
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cube(chamfer_size, center=true);
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}
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} else if (shape == "pyramid") {
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$fn=4;
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cylinder(chamfer_size/2/cos(180/$fn),chamfer_size/2,0);
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}
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}
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module lower_chamfer() {
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minkowski()
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{
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linear_extrude(0.0001) difference() {
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square([1000,1000],center=true);
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projection()children(0);
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}
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chamfer_shape();
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}
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}
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module upper_chamfer() {
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scale([1,1,-1])lower_chamfer()children();
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}
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render()difference() {
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children();
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translate([0,0,child_bot])lower_chamfer()children();
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translate([0,0,child_bot+child_h])upper_chamfer()children();
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}
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}
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/////////////////////////////////////////////////////////////////////////
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module my_shape(h=5) {
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translate([0,0,h/2]) {
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difference() {
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cube([50,50,h],center=true);
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cube([20,20,h+1],center=true);
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}
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translate([20,21,0])cylinder(h=h,r=20,center=true);
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}
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}
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h=5;
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chamfer(3, child_h=h, shape="cone")
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my_shape(h);
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@ -10,51 +10,65 @@ TIP_BEND=20;
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RAKE_DEPTH=1;
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RAKE_DEPTH=1;
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RAKE_WIDTH=1;
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RAKE_WIDTH=1;
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RAKE_STRETCH=1;
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RAKE_STRETCH=1;
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RAKE_CHAMPFER=0.5;
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RAKE_CHAMFER=0.5;
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CHAMFER=1;
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CHAMFER_SHAPE="cone";
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use <chamfer.scad>
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module partial_ring(part, radius, thickness, height) {
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module partial_ring(part, radius, thickness, height) {
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rotate(180-180*part, [0, 0, 1])
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rotate(180-180*part, [0, 0, 1])
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rotate_extrude(angle=360*part)
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rotate_extrude(angle=360*part)
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translate([radius, 0])
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translate([radius, 0])
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square([thickness, height], center=true);
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square([thickness, height], center=true);
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}
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}
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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) {
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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) {
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union() {
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union() {
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color("purple") partial_ring(part, radius=size, thickness=thickness, height=height);
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chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape) union() {
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rotate( 90-180*part, [0, 0, 1]) translate([stretch_len/2, size, 0]) {
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color("purple")
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color("orange") cube([stretch_len, thickness, height], center=true);
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partial_ring(part, radius=size, thickness=thickness, height=height);
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rotate( 90-180*part, [0, 0, 1])
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translate([stretch_len/2, size, 0]) {
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color("orange") cube([stretch_len, thickness, height], center=true);
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color("purple") translate([stretch_len/2, tip_bend, 0])
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color("purple") translate([stretch_len/2, tip_bend, 0])
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rotate(90+180*tip_len, [0, 0, 1])
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rotate(90+180*tip_len, [0, 0, 1])
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partial_ring(
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partial_ring(
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part=tip_len,
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part=tip_len,
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radius=tip_bend,
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radius=tip_bend,
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thickness=thickness,
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thickness=thickness,
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height=height
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height=height
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);
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);
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}
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}
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rotate(-90+180*part, [0, 0, 1]) translate([stretch_len/2, -size, 0]) {
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rotate(-90+180*part, [0, 0, 1])
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color("orange") cube([stretch_len, thickness, height], center=true);
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translate([stretch_len/2, -size, 0]) {
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color("purple") scale([1, -1, 1]) translate([stretch_len/2, tip_bend, 0])
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color("orange")
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cube([stretch_len, thickness, height], center=true);
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color("purple")
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scale([1, -1, 1])
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translate([stretch_len/2, tip_bend, 0])
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rotate(90+180*tip_len, [0, 0, 1])
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rotate(90+180*tip_len, [0, 0, 1])
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partial_ring(
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partial_ring(
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part=tip_len,
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part=tip_len,
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radius=tip_bend,
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radius=tip_bend,
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thickness=thickness,
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thickness=thickness,
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height=height
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height=height
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);
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);
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}
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}
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for (i=[-size/2:size/2]) {
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rotate(i*2-rake_width/2, [0, 0, 1])
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intersection() {
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scale([1, 1, rake_stretch/(rake_depth/height)])
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translate([0, rake_width/2, 0])
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rotate_extrude(angle=rake_width)
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translate([rake_depth/2-size+thickness/2, 0, 0])
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scale([1, 0.5, 1])
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circle(r=rake_depth, $fn=3);
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translate([rake_depth/2-size+thickness/2-rake_chamfer, 0, 0])
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color("red")
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cube([2*rake_depth, rake_width, height], center=true);
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}
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}
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for (i=[-size/2:size/2]) {
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rotate(i*2-rake_width/2, [0, 0, 1]) intersection() {
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scale([1, 1, rake_stretch/(rake_depth/height)])
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translate([0, rake_width/2, 0]) rotate_extrude(angle=rake_width)
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translate([rake_depth/2-size+thickness/2, 0, 0])
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scale([1, 0.5, 1])
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circle(r=rake_depth, $fn=3);
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translate([rake_depth/2-size+thickness/2-rake_champfer, 0, 0])
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color("red")
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cube([2*rake_depth, rake_width, height], center=true);
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}
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};
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};
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};
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};
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}
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}
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