mead-horn/mead-horn.scad

   1 // 2021
   2
   3 // Single person mead horn, for winter solstice 2021 since sharing
   4 // mead from the real horn is probably still unsafe.
   5
   6 use <dotscad/shape_circle.scad>;
   7 use <dotscad/helix_extrude.scad>;
   8
   9 bottom_radius =   4;
  10 top_radius    =  33;
  11 horn_length   = 135;
  12 horn_rise     =  40;
  13 horn_twist    =   0;
  14 horn_aspect   = [ 1.0, 0.92 ];
  15
  16 module helix_horn () {
  17      helix_levels = 1/6;
  18
  19      arc_measure  = (360 * helix_levels) * (3.13 / 180);
  20      arc_length   = horn_length;
  21      helix_radius = (arc_length / arc_measure);
  22
  23      // Round off end
  24      // todo: dotscad rounded cone instead?
  25      translate ([helix_radius, 0, 0]) scale ([horn_aspect[0], 1/2, horn_aspect[1]]) intersection () {
  26           sphere (r = bottom_radius);
  27           rotate ([90, 0, 0]) cylinder (h = bottom_radius, r = bottom_radius, center=false);
  28      }
  29
  30      shape_pts = [ for (pts = shape_circle (radius = bottom_radius)) [ pts[0] * horn_aspect[0], pts[1] * horn_aspect[1] ] ];
  31
  32      helix_extrude(shape_pts,
  33                    radius = helix_radius,
  34                    scale = top_radius/bottom_radius,
  35                    levels = helix_levels,
  36                    level_dist = horn_rise / helix_levels,
  37                    vt_dir = "SPI_UP",
  38                    twist = horn_twist / helix_levels
  39           );
  40 }
  41
  42 helix_horn ($fs = 0.1, $fa = 1);