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djerun 2025-06-15 16:30:38 +02:00
commit 519a41c7a4
4 changed files with 71 additions and 24 deletions
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pressfit_catears.scad
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@ -1,5 +1,7 @@
include <globals.scad>;
include <primitives.scad>;
use <headband.scad>;
use <catear_headband.scad>;
use <pressfit_headband.scad>;
use <chamfer.scad>;
@ -7,9 +9,9 @@ use <chamfer.scad>;
EAR_SCALE = 1.5;
EAR_BEND_FACTOR = 0.15;
EAR_STRETCH_FACTOR = 1.2;
STEP_SIZE = 1;
STEP_SIZE = 100;
difference() {
translate([50, 0, 0]) difference() {
translate([20*pow(0.99, SIZE/2*EAR_SCALE-1-THICKNESS), 0, -THICKNESS/2])
union() for (i=[0:STEP_SIZE:SIZE/2*EAR_SCALE-1]) {
j=pow(0.99, i);
@ -32,3 +34,25 @@ difference() {
translate([0, 0, -THICKNESS]) cube([100, 100, THICKNESS], center=true);
scale([1, 1, 2]) inserticle();
}
side_len=SIZE/2*EAR_SCALE;
r=side_len/2;
E=1.6*EAR_STRETCH_FACTOR;
e=E*(r+THICKNESS/4)/(r-THICKNESS/4);
T=side_len+THICKNESS;
S=side_len-THICKNESS;
xremap = function (x) pow(x, EAR_STRETCH_FACTOR);
yremap = function (y) pow(y, 1);
//f = function (p) [j((p.x+T/2)/T)*T-T/2, pow(p.y, 2)/r*E, p.z];
//g = function (p) [j((p.x+S/2)/S)*S-S/2, pow(p.y, 2)/r*E*(T+THICKNESS)/S, p.z];
f = function (p) [scalc(xremap, p.x, -T/2, T/2), scalc(yremap, p.y, 0, T/2)*E, p.z];
g = function (p) [scalc(xremap, p.x, -S/2, S/2), scalc(yremap, p.y, 0, S/2)*e, p.z];
rotate([0, 90, 0]) color("yellow") arc(0.5, r, THICKNESS, HEIGHT, outer_remap=f, inner_remap=g);
color("red") catear_v2(HEIGHT, THICKNESS, side_len=SIZE/2*EAR_SCALE, stretch_factor=EAR_STRETCH_FACTOR);
// a = b + c
// x * a = y * b + c
// y / x = a /(b + c)
// y = x * a /(b + c)