round the corner of sonar table top holder

[challenge-bot] / 3d-printables / sonar-table-top-holder.scad

diff --git a/3d-printables/sonar-table-top-holder.scad b/3d-printables/sonar-table-top-holder.scad
index 42578116602547606d7927d23504471146d9f736..8f0d1539d9a9aa6f39172a40759669127db5723f 100644 (file)
--- a/3d-printables/sonar-table-top-holder.scad
+++ b/3d-printables/sonar-table-top-holder.scad
@@ -4,8 +4,20 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
+/*
+  this holds an hc-sr04 sonar sensor to a 3/16 inch deck.
+  http://fritzing.org/projects/hc-sr04-project
+  it can hold the sonar sensor either facing down, or forwards.
+  when facing down, it can detect if it passes over the edge of a table.
+  when facing forwards, it can detect and follow something in front of it.
+ */
+
 $fn = 60;
 
+use <oshw.scad>
+oshw_dy = 120.366;
+oshw_dx = 133.888;
+
 // 3/16 inch in mm deck_depth = 4.7625;
 // 1/4 inch in mm = 6.35
 // subtract a little to be a squeeze fit
@@ -44,10 +56,15 @@ module sonars(){
 
 module sonar_holder(){
   elbow_length = deck_depth - 0.5;
+  rounded_corner_radius = buffer;
   difference(){
     cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
     translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]){
-      sonars();}}
+      sonars();}
+    translate([sonar_holder_length - rounded_corner_radius,
+               sonar_holder_width - rounded_corner_radius,
+               0]){
+      corner_rounder(rounded_corner_radius, sonar_holder_depth);}}
   translate([sonar_holder_length, 0, 0]){
     cube([elbow_length, deck_depth, sonar_holder_depth]);
     translate([elbow_length, 0, 0]){
@@ -69,15 +86,39 @@ module sonar_holder(){
 
 module deck_holder(){
   deck_holder_width = sonar_holder_width - deck_depth;
+  deck_holder_height = sonar_holder_depth * 2 + deck_depth;
   linear_extrude(height = deck_holder_width){
     difference(){
-      square([deck_holder_length, sonar_holder_depth * 2 + deck_depth]);
+      square([deck_holder_length, deck_holder_height]);
       translate([sonar_holder_depth, sonar_holder_depth]){
         square(deck_depth);}
-      translate([sonar_holder_depth * 2 + deck_depth, sonar_holder_depth]){
-        square([deck_holder_length - (sonar_holder_depth * 2 + deck_depth),
-                deck_depth]);}}}}
+      translate([deck_holder_height, sonar_holder_depth]){
+        square([deck_holder_length - (deck_holder_height), deck_depth]);}}}
+  translate([deck_holder_length - oshw_dy * 0.05, 0, deck_holder_width / 2])
+    scale([0.1, 1, 0.1])
+      rotate(v = [1, 0, 0], a = 90)
+        rotate(90)
+          linear_extrude(height = 0.5)
+            oshw();
+  translate([deck_holder_length - oshw_dy * 0.05,
+             deck_holder_height + 0.5,
+             deck_holder_width / 2])
+    rotate(v = [1, 0, 0], a = 90)
+      rotate(90)
+        scale([0.1, 0.1, 1])
+          linear_extrude(height = 0.5)
+            oshw();}
+
+module corner_rounder_2d(radius){
+    difference (){
+        square (radius);
+        circle (radius);}}
+
+module corner_rounder(radius, height){
+    linear_extrude(height = height){
+        corner_rounder_2d(radius);}}
 
 deck_holder();
+
 translate([0, sonar_holder_depth * 2 + deck_depth + 2, 0]){
   sonar_holder();}