From: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Date: Sun, 18 May 2014 14:26:35 +0000 (+0200)
Subject: rocked.scad: first printed version
X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=commitdiff_plain;h=538652f820660c5cedd6a843fc421e572e4536b2;p=things.git

rocked.scad: first printed version
---

diff --git a/rocket.scad b/rocket.scad
index 12d0378..b0bf088 100644
--- a/rocket.scad
+++ b/rocket.scad
@@ -2,7 +2,7 @@
 // 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 + 0.5; // add some tolerance
+motor_diam = 17.7 + 0.7; // add some tolerance
 motor_len  = 69.5 + 0.5;
 motor_wall = 2;
 
@@ -15,6 +15,7 @@ clip_spring_angle = 45;
 clip_spring_depth = 20;
 
 rod_diam = 4;
+rubber_beam_height = 3;
 
 eps = 0.01;
 infty = 1000;
@@ -38,8 +39,8 @@ module fin() {
 // alternative fin layout
 module fin2() {
 	assign(h1 = motor_len/2, // near end height
-		w2 = 18,	// bottom/far end width
-		h_off = 50, // height offset of the far height
+		w2 = 23,	// bottom/far end width
+		h_off = 60, // height offset of the far height
 		w = 30, // distance of the far height
 		fin_w = thin_wall)
 	translate([0, -fin_w/2, -h1])
@@ -183,11 +184,19 @@ module central_tube() {
 			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-thin_wall, -infty/2,
+			segment_overlap + thick_wall])
+			cube([thin_wall, infty, rubber_beam_height]);
+	};
 };
 
 //------------------------- FRONT CONE -----------------------
 cone_h = 45;
 cone_resolution = 40;
+cone_solid_h = 10;
 
 function bez_i4(t, ctls) =
 	(pow(1-t, 3) * ctls[0])
@@ -225,13 +234,17 @@ module front_cone_body() {
 module front_cone() {
 	difference() {
 		front_cone_body();
-		translate([0, 0, segment_overlap])
-			bezier_cone([
-				[ 0.7*thin_wall, motor_diam/2 + thick_wall - thin_wall ], // start
-			[ cone_h/2-0.7*thin_wall, motor_diam/2 + thick_wall - thin_wall], // cp 1
-			[ cone_h - motor_diam/2 - thick_wall + thin_wall - 1.4*thin_wall, motor_diam/2 + thick_wall - thin_wall ], // cp 2
-			[ cone_h - 1.4*thin_wall, 0 ],
-		], 40);
+		intersection() {
+			translate([0, 0, segment_overlap])
+				bezier_cone([
+					[ 0.7*thin_wall, motor_diam/2 + thick_wall - thin_wall ], // start
+				[ cone_h/2-0.7*thin_wall, motor_diam/2 + thick_wall - thin_wall], // cp 1
+				[ cone_h - motor_diam/2 - thick_wall + thin_wall - 1.4*thin_wall, motor_diam/2 + thick_wall - thin_wall ], // cp 2
+				[ cone_h - 1.4*thin_wall, 0 ],
+			], 40);
+			cylinder(r = motor_diam/2 + thick_wall + eps,
+				h = cone_h + segment_overlap - cone_solid_h);
+		};
 
 		translate([0, 0, segment_overlap-thick_wall+1.7*thin_wall])
 			cylinder(r1 = motor_diam/2,
@@ -240,9 +253,13 @@ module front_cone() {
 
 		translate([0, 0, -eps])
 			cylinder(r = motor_diam/2, h = segment_overlap + 2*eps);
-
-		// debug
-		// translate([0, 0, -eps]) cube(infty);
+	};
+	// 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/2 - rubber_beam_height/2])
+			cube([thin_wall, infty, rubber_beam_height]);
 	};
 };
 
@@ -258,6 +275,16 @@ module thread_holder() {
 
 // thread_holder();
 
+// debug
+difference() {
+	// front_cone();
+	// central_tube();
+	// motor_module();
+
+	// translate([0, 0, -eps]) cube(infty);
+};
+
+// production
 $fn = 128;
 
 translate([motor_diam + thick_wall, 0, 0])
@@ -270,4 +297,3 @@ translate([motor_diam + thick_wall, 0, 0])
 rotate([0, 0, 240])
 translate([motor_diam + thick_wall, 0, 0])
 	front_cone();
-