67 lines
1.2 KiB
OpenSCAD
67 lines
1.2 KiB
OpenSCAD
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include <globals.scad>;
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use <pressfit_headband.scad>;
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$fn=360;
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A=30;
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N=4;
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R=45;
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LENGTH=100;
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TWIST=720;
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STEPS=360;
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SLICES=max(TWIST, STEPS, LENGTH);
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SHEIGHT=LENGTH/STEPS;
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BEND_X_FACTOR=0.5;
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BEND_Y_FACTOR=1;
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COLORS=[
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"#f00",
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"#f70",
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"#7f0",
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"#0f0",
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"#0f7",
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"#07f",
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"#00f",
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"#70f",
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"#f07"
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];
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difference() {
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union() for (step=[1:STEPS]) {
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a = A*(1-(step-1)/STEPS);
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b = A*(1-step/STEPS);
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r = TWIST/STEPS*(step-1);
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sh_xy = 0;
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sh_yx = 0;
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sh_xz = 1/STEPS*step*BEND_X_FACTOR;
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sh_yz = 1/STEPS*step*BEND_Y_FACTOR;
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sh_zx = 0;
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sh_zy = 0;
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t_x = sh_xz*SHEIGHT*(step-1)*0.5;
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t_y = sh_yz*SHEIGHT*(step-1)*0.5;
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t_z = LENGTH/STEPS*(step-1);
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sc_x = 1;
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sc_y = 1;
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sc_z = 1;
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mm = [
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[sc_x, sh_xy, sh_xz, t_x],
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[sh_yx, sc_y, sh_yz, t_y],
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[sh_zx, sh_zy, sc_z, t_z],
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];
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echo(a, b, b/a, r, mm);
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multmatrix(mm)
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color(COLORS[(step-1)%9])
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linear_extrude(
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SHEIGHT,
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center=false,
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twist=TWIST/STEPS,
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scale=b/a,
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slices=SLICES/STEPS
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) rotate(R-r)
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circle(d=a, $fn=N);
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}
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translate([0, 0, INSERTICLE_Z/2])
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inserticle();
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}
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echo("twist angle: ", TWIST/STEPS);
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