challenge-bot.com Git - challenge-bot/blob - 3d-printables/sonar-table-top-holder-dimensions.scad

   1 // 3/16 inch in mm deck_depth = 4.7625;
   2 // 1/4 inch in mm = 6.35
   3 // subtract a little to be a squeeze fit
   4 deck_depth = 4.7625 - 0.4;
   5 // sonar sensor measurements taken with calipers:
   6 //  10.82 in between, 42.33 outside, 15.82 diameter
   7 // measured diameter of 15.82 with calipers,
   8 //  but when printed ends up being too small, so add some
   9 sonar_diameter = 15.82 + 0.4;
  10 sonar_radius = sonar_diameter / 2;
  11 sonar_height = 13.8;
  12 between_sonar_centers = sonar_diameter + 10.82;
  13 // the sonar cylinders are placed on the pcb at slightly different positions
  14 //  from one sensor to the next, so this allows for that variance.
  15 between_sonar_centers_variance = 2;
  16 // keep at least this much plastic surrounding the sonar cylinder on all sides
  17 buffer = 3;
  18 sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer;
  19 sonar_holder_width = buffer + sonar_diameter + buffer;
  20 // sonar_holder_depth is deck_depth minus a little bit to make arm fit
  21 //  into deck holder
  22 sonar_holder_depth = deck_depth - 0.7875;
  23
  24 deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15;