X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=sonar-table-top-holder.scad;h=9cb881de5609da37309af24bcb85dd60511fba9d;hb=458dfcbecacab3244c9c988877546c35fbf456dc;hp=18efe08119ee219a31d1a4e182dc2d4fae3d78a0;hpb=e747f01347e2365ab484651b6583bca119b5f1a6;p=challenge-bot

diff --git a/sonar-table-top-holder.scad b/sonar-table-top-holder.scad
index 18efe08..9cb881d 100644
--- a/sonar-table-top-holder.scad
+++ b/sonar-table-top-holder.scad
@@ -4,28 +4,73 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
+$fn = 60;
 
-// sonar sensor measurements from https://www.thingiverse.com/thing:92869,
-//  released under GPL.
-deck_depth = 4.7625; // 3/8 inch in mm
+// 3/16 inch in mm deck_depth = 4.7625;
+// 1/4 inch in mm - a little to be a squeeze fit
+deck_depth = 6.35 - 0.4;
 sonar_plate_width = 20;
-sonar_plate_length = 45;
-sonar_plate_height = 1.2;
-sonar_sensor_radius = 8;
+// sonar sensor measurements taken with calipers:
+//  10.82 in between, 42.33 outside, 15.82 diameter
+// measured diameter of 15.82 with calipers,
+//  but when printed ends up being too small
+sonar_sensor_radius = 15.82 / 2 + 0.3;
 sonar_sensor_height = 13.8;
-sonar_holder_length = sonar_plate_length + 30;
-sonar_holder_depth = 3;
-
-difference (){
-  union(){
-    cube([sonar_holder_length, sonar_plate_width, sonar_holder_depth]);
-    translate([sonar_plate_length + 5, 0, sonar_holder_depth]){
-      cube([5, sonar_plate_width, deck_depth]);
-      translate([0, 0, deck_depth]){
-        cube([sonar_holder_length - sonar_plate_length - 5,
-              sonar_plate_width,
-              sonar_holder_depth]);}}}
-  translate([45/2 - 13.5, 10, 0]){
-    cylinder(r=sonar_sensor_radius, h = sonar_sensor_height, center = true);}
-  translate([45/2 + 13.5, 10, 0]){
-    cylinder(r=sonar_sensor_radius, h = sonar_sensor_height, center = true);}}
+between_sensor_centers = 15.82 + 10.82;
+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;
+sonar_holder_depth = 4;
+
+deck_holder_length = 30;
+deck_holder_width = sonar_holder_width;
+
+module sensors(){
+  translate([between_sensor_centers / 2, 0, 0]){
+    cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}
+  translate([-between_sensor_centers / 2, 0, 0]){
+    cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}}
+
+module sensor_holder(){
+  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 + 0.3, deck_depth - 0.3, deck_depth - 0.3]);
+    translate([sonar_holder_depth + 0.3, 0, 0]){
+      // subtract a little bit (0.3) to make it fit
+      cube([deck_depth - 0.3, sonar_holder_width, deck_depth - 0.3]);}}}
+
+module deck_holder(){
+  cube([deck_holder_length, sonar_holder_depth, sonar_holder_width]);
+  cube([sonar_holder_depth,
+        sonar_holder_depth * 2 + deck_depth,
+        sonar_holder_width]);
+  translate([0, sonar_holder_depth + deck_depth, 0]){
+    cube([deck_holder_length, sonar_holder_depth, sonar_holder_width]);}
+  translate([sonar_holder_depth + deck_depth, 0, 0]){
+    cube([sonar_holder_depth,
+          sonar_holder_depth * 2 + deck_depth,
+          sonar_holder_width]);}}
+
+module sonar_table_top_holder(){
+  difference(){
+    union(){
+      cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
+      translate([sonar_holder_length, 0, 0]){
+        deck_holder();}}
+    translate([between_sensor_centers / 2 + sonar_sensor_radius + 3,
+               sonar_holder_width / 2,
+               -1]){
+      sensors();}
+    // cut out a bit of the circle to make it 3d printable,
+    //  no severe overhang
+    translate([3 + sonar_sensor_radius,
+               sonar_holder_width - 3.025,
+               sonar_holder_depth / 2 - 0.025]){
+      cube([10, 6.1, sonar_holder_depth + .1], center = true);
+      translate([between_sensor_centers, 0, 0]){
+        cube([10, 6.1, sonar_holder_depth + .1], center = true);}}}}
+
+sensor_holder();