update sonar sensor holder after physical test

diff --git a/sonar-table-top-holder.scad b/sonar-table-top-holder.scad
index 4fa2dda21b645e412b2631410c39a66acd4a448b..1381dd5126d947e1523ba6de5e1653676668ab88 100644 (file)
--- a/sonar-table-top-holder.scad
+++ b/sonar-table-top-holder.scad
@@ -4,18 +4,22 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
-// sonar sensor measurements from https://www.thingiverse.com/thing:92869,
-
 // 3/8 inch in mm
 deck_depth = 4.7625;
 sonar_plate_width = 20;
 sonar_plate_length = 45;
-sonar_sensor_radius = 8;
+// sonar sensor measurements taken with calipers:
+//  9.6 in between, 41.33 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;
+between_sensor_centers = 15.82 + 9.6;
+
 sonar_holder_length = sonar_plate_length + 10;
 sonar_holder_width = sonar_plate_width + 3;
 sonar_holder_depth = 3;
-between_sensor_centers = 27;
+
 
 module sensors(){
   translate([between_sensor_centers / 2, 0, 0]){