// 3/16 inch in mm deck_depth = 4.7625;
// 1/4 inch in mm = 6.35
// subtract a little to be a squeeze fit
-deck_depth = 6.35 - 0.4;
+deck_depth = 4.7625 - 0.4;
sonar_plate_width = 20;
// sonar sensor measurements taken with calipers:
// 10.82 in between, 42.33 outside, 15.82 diameter
// but when printed ends up being too small
sonar_sensor_radius = 15.82 / 2 + 0.3;
sonar_sensor_height = 13.8;
-between_sensor_centers = 15.82 + 10.82;
+between_sensor_centers = sonar_sensor_radius * 2 + 10.82;
+between_sensor_centers_variance = 2;
sonar_plate_length = 3 + between_sensor_centers + sonar_sensor_radius + 3;
sonar_holder_length = sonar_plate_length + 10;
sonar_holder_width = sonar_plate_width + 3;
module sensors(){
translate([between_sensor_centers / 2, 0, 0]){
cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}
+ translate([between_sensor_centers / 2 - between_sensor_centers_variance,
+ 0,
+ 0]){
+ cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);
+ translate([0, -sonar_sensor_radius, 0]){
+ cube([between_sensor_centers_variance,
+ sonar_sensor_radius * 2,
+ sonar_sensor_height]);}}
translate([-between_sensor_centers / 2, 0, 0]){
cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}}
module sensor_holder(){
+ // arm_depth is deck_depth minus a little bit to make it fit
+ arm_depth = deck_depth - 0.7;
+ elbow_length = deck_depth + 0.8;
difference(){
cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]){
sensors();}}
translate([sonar_holder_length, 0, 0]){
- cube([sonar_holder_depth + 0.7, deck_depth, deck_depth - 0.7]);
- translate([sonar_holder_depth + 0.7, 0, 0]){
- // subtract a little bit (0.3) to make it fit
- cube([deck_depth - 0.7, sonar_holder_width, deck_depth - 0.7]);}}}
+ cube([elbow_length, deck_depth, arm_depth]);
+ translate([elbow_length, 0, 0]){
+ linear_extrude(height = arm_depth){
+ polygon([[0, 0],
+ [arm_depth, 0],
+ [arm_depth, sonar_holder_width / 2],
+ [0, sonar_holder_width / 2 + arm_depth]]);}
+ translate([0, (sonar_holder_width + arm_depth) / 2, 0]){
+ cube([arm_depth / 2,
+ (sonar_holder_width - arm_depth) / 2 + 0.8,
+ arm_depth]);}
+ translate([-1.7, sonar_holder_width + 0.8, 0]){
+ linear_extrude(height = arm_depth){
+ polygon([[0, 0],
+ [arm_depth / 2 + 1.7, 4],
+ [arm_depth / 2 + 1.7, 0]]);}}}}}
module deck_holder(){
deck_holder_width = sonar_holder_width - deck_depth;