X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=rocket.scad;h=23594977fbc513f9738af15b5e91d9a98ca1fc3b;hb=HEAD;hp=b2f621bbaaf971c7e24504a4b4d67306e6841a9c;hpb=ee9fb6e94bee92b17ad0f16a2e4797e346788311;p=things.git

diff --git a/rocket.scad b/rocket.scad
index b2f621b..2359497 100644
--- a/rocket.scad
+++ b/rocket.scad
@@ -2,15 +2,15 @@
 // The Estes A8-3 and C6-7 motors have diameter of 17.7 mm,
 // length 69.5 mm. The Estes Alpha launch pad has rod diameter 3.4 mm.
 
-motor_diam = 17.7 + 0.6; // add some tolerance
+motor_diam = 17.7 + 1.2; // add some tolerance
 motor_len  = 69.5 + 0.5;
 
 segment_overlap = 15;
 
-loose_fit_diam_diff = 0.5; // cylinder with outer diameter d1
+loose_fit_diam_diff = 1.1; // cylinder with outer diameter d1
 	// will fit loosely into the hole with inner diameter
 	// d1 + loose_fit_diam_diff
-tight_fit_diam_diff = 0.25; // cylinder with outer diameter d1
+tight_fit_diam_diff = 0.4; // cylinder with outer diameter d1
 	// will fit tightly into the hole with inner diameter
 	// d1 + tight_fit_diam_diff
 
@@ -33,6 +33,25 @@ fin_thickness = 1.5;
 eps = 0.01;
 infty = 250;
 
+// rod holder
+
+module rod_holder() {
+	// rod hole holder
+	hull() {
+		translate([motor_diam/2 + thick_wall + thin_wall + rod_diam/2, 0, 0])
+			cylinder(r = rod_diam/2 + thin_wall, h = thick_wall);
+		translate([motor_diam/2 + thick_wall - thin_wall - rod_diam/2, 0, 0])
+				
+			cylinder(r = rod_diam/2 + thin_wall, h = 3*thick_wall);
+	}
+}
+
+module rod_hole() {
+	// rod hole
+	translate([motor_diam/2 + thick_wall + thin_wall + eps + rod_diam/2, 0, 0])
+		cylinder(r = rod_diam/2, h = infty);
+}
+
 //----------------- MOTOR MODULE -----------------------------
 
 module fin() {
@@ -98,21 +117,6 @@ module motor_module_solid()
                         fin2();
         };
 
-	// rod hole holder
-	hull() {
-		translate([motor_diam/2 + thick_wall - rod_diam/2 - thin_wall,
-			0, segment_overlap])
-			scale([1, 1.4, 1])
-			cylinder(r = rod_diam/2 + thin_wall, h = eps);
-		translate([motor_diam/2 + thick_wall + thin_wall + rod_diam/2, 0, segment_overlap + rod_hole_side])
-			scale([1, 1.1, 1])
-			cylinder(r = rod_diam/2 + thin_wall, h = rod_hole_height);
-		translate([motor_diam/2 + thick_wall - rod_diam/2 - thin_wall,
-			0, segment_overlap + 2*rod_hole_side + rod_hole_height])
-			scale([1, 1.4, 1])
-			cylinder(r = rod_diam/2 + thin_wall, h = eps);
-	};
-
 	// motor clip
 	for (angle = [120, -120]) rotate([0, 0, angle]) intersection() {
 		translate([clip_inner_space, -infty/2,
@@ -123,6 +127,10 @@ module motor_module_solid()
 		rotate([0, 0, -120])
 			translate([-infty/2, 0, 0]) cube(infty);
 	};
+
+	translate([0, 0, motor_len + motor_wall])
+		scale([1, 1, -1])
+		rod_holder();
 };
 	
 module motor_module() {
@@ -151,9 +159,7 @@ module motor_module() {
 					cylinder(r = 3, h = infty);
 		};
 
-		// rod hole
-		translate([motor_diam/2 + thick_wall + thin_wall + eps + rod_diam/2, 0, 0])
-			cylinder(r = rod_diam/2, h = infty);
+		rod_hole();
 	};
 };
 
@@ -168,6 +174,7 @@ central_clip_clearance = 2.5;
 
 module central_tube_solid() {
 	cylinder(r = motor_diam/2 + thick_wall, h = central_tube_h);
+	rod_holder();
 };
 
 module central_tube() {
@@ -176,22 +183,7 @@ module central_tube() {
 		translate([0, 0, -eps])
 			cylinder(r = motor_diam/2 + thick_wall - thin_wall,
 				h = infty);
-	};
-	// rubber band holder
-	intersection() {
-		cylinder(r = motor_diam/2 + thick_wall - eps, h = central_tube_h);
-/*
-		translate([motor_diam/2 - thick_wall, -infty/2,
-			segment_overlap + thick_wall])
-			cube([thin_wall, infty, rubber_beam_height]);
-*/
-		translate([-central_clip_w/2,
-			central_clip_r + motor_diam/2 + thick_wall - 2*thin_wall - central_clip_clearance,
-			central_tube_h/3]) rotate([0, 90, 0]) difference() {
-			cylinder(r = central_clip_r, h = central_clip_w);
-			translate([0, 0, -eps])
-				cylinder(r = central_clip_r - central_clip_wall, h = central_clip_w + 2*eps);
-		}
+		rod_hole();
 	};
 };
 
@@ -256,13 +248,6 @@ module front_cone() {
 		translate([0, 0, -eps])
 			cylinder(r = motor_diam/2, h = segment_overlap + 2*eps);
 	};
-	// rubber band holder
-	intersection() {
-		cylinder(r = motor_diam/2 + thin_wall/2, h = segment_overlap);
-		translate([motor_diam/3-thin_wall/2, -infty/2,
-			segment_overlap - thick_wall - rubber_beam_height - eps])
-			cube([rubber_beam_width, infty, rubber_beam_height]);
-	};
 };
 
 debug = 0;
@@ -271,8 +256,8 @@ if (debug == 1) {
 // debug
 difference($fn = 16) {
 	front_cone();
-	// central_tube();
-	// motor_module();
+	central_tube();
+	motor_module();
 
 	translate([0, 0, -infty/2]) cube(infty);
 };
@@ -280,7 +265,7 @@ difference($fn = 16) {
 } else {
 
 // production
-assign($fn = 128) {
+$fn = 128;
 
 translate([motor_diam + thick_wall, 0, 0])
 	motor_module();
@@ -294,4 +279,3 @@ translate([motor_diam + thick_wall, 0, 0])
 	front_cone();
 
 }
-}