fully encircle propeller with guard

diff --git a/crazyflie-2.0-housing.scad b/crazyflie-2.0-housing.scad
index 1bbd7e58d17099282dc089b029dd57349e8673c4..f4f59cc781fd1f47c1dfa1986d76fecaa017c101 100644 (file)
--- a/crazyflie-2.0-housing.scad
+++ b/crazyflie-2.0-housing.scad
@@ -9,70 +9,56 @@
    wrapped around the motor shaft.
  */
 
-main_body_width_measured = 28.0;
-main_body_length_measured = 31.0;
-main_body_height_measured = 1.5;
+$fn = 300;
 
-arm_width_measured = 3.6;
-arm_length_measured = 79.0;
-arm_height_measured = main_body_height_measured;
+// propeller diameter was measured with calipers
+propeller_radius = 46.35 / 2;
+// 7mm from spec
+motor_grippable_height = 8;
+motor_gripper_height = motor_grippable_height / 2;
+holder_height = motor_grippable_height * 1.1;
 
-motor_diameter_measured = 7;
-motor_height_measured = 17;
-motor_radius_measured = motor_diameter_measured / 2;
-
-/*this is how far down the motor sticks below the circuit board*/
-motor_z_offset_measured = 5;
+propeller_radius_measured = 46.35 / 2;
+holder_wall_thickness = 1.2;
+propeller_guard_wall_thickness = 1.2;
 
-motor_z_translate = (motor_height_measured - arm_height_measured) / 2 - motor_z_offset_measured;
+motor_diameter = 7;
+motor_height_measured = 17;
+motor_radius = motor_diameter / 2;
 
-cube([main_body_width_measured,
-      main_body_length_measured,
-      main_body_height_measured],
-     center = true);
-rotate(45){
-  cube([arm_width_measured,
-        arm_length_measured,
-        arm_height_measured],
-       center = true);}
-rotate(-45){
-  cube([arm_width_measured,
-        arm_length_measured,
-        arm_height_measured],
-       center = true);}
+module propeller_protector(motor_radius,
+                           holder_wall_thickness,
+                           propeller_guard_wall_thickness,
+                           motor_gripper_height,
+                           holder_height,
+                           propeller_radius) {
+  propeller_guard_inner_radius = propeller_radius + 1.5;
+  holder_outer_radius = motor_radius + holder_wall_thickness;
+  number_of_arms = 3;
+  linear_extrude(height = motor_gripper_height) {
+    // part that holds the motor
+    difference() {
+      circle(r = holder_outer_radius);
+      circle(r = motor_radius); }
+    for(arm_number = [0: (number_of_arms - 1)]) {
+      rotate(arm_number * (360 / number_of_arms)) {
+        translate([-propeller_guard_inner_radius,
+                   -holder_wall_thickness / 2]) {
+          square([propeller_guard_inner_radius - motor_radius,
+                  holder_wall_thickness]); } } } }
+  // prop protector
+  linear_extrude(height = holder_height) {
+    difference() {
+      circle(propeller_guard_inner_radius +
+             propeller_guard_wall_thickness);
+      circle(propeller_guard_inner_radius); } } }
 
-rotate(45) {
-  translate([arm_length_measured / 2 + motor_radius_measured,
-             0,
-             motor_z_translate]){
-    cylinder(h = motor_height_measured,
-             r = motor_radius_measured,
-             center = true,
-             $fn = 50); } }
-rotate(45 + 90) {
-  translate([arm_length_measured / 2 + motor_radius_measured,
-             0,
-             motor_z_translate]){
-    cylinder(h = motor_height_measured,
-             r = motor_radius_measured,
-             center = true,
-             $fn = 50); } }
-rotate(45 + 90 * 2) {
-  translate([arm_length_measured / 2 + motor_radius_measured,
-             0,
-             motor_z_translate]){
-    cylinder(h = motor_height_measured,
-             r = motor_radius_measured,
-             center = true,
-             $fn = 50); } }
-rotate(45 + 90 * 3) {
-  translate([arm_length_measured / 2 + motor_radius_measured,
-             0,
-             motor_z_translate]){
-    cylinder(h = motor_height_measured,
-             r = motor_radius_measured,
-             center = true,
-             $fn = 50); } }
+propeller_protector(motor_radius,
+                    holder_wall_thickness,
+                    propeller_guard_wall_thickness,
+                    motor_gripper_height,
+                    holder_height,
+                    propeller_radius_measured);
 
 /*
   This file is part of 3d-printables.