From: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Date: Mon, 20 Oct 2014 15:21:02 +0000 (+0200)
Subject: rocket.scad: further tuning:
X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=commitdiff_plain;h=a6d04987a7075f54a3de01817f52114abb1cfa51;p=things.git

rocket.scad: further tuning:

- 0.9 mm wall is too thin
- wider and thicker rubber band holders
- front cone rubber band holder moved down
- sharper front cone
- two motor clips instead of one, a bit thicker and lower positioned
- higher middle cylinder
---

diff --git a/rocket.scad b/rocket.scad
index d5b22b6..3acc358 100644
--- a/rocket.scad
+++ b/rocket.scad
@@ -14,22 +14,24 @@ tight_fit_diam_diff = 0.25; // cylinder with outer diameter d1
 	// will fit tightly into the hole with inner diameter
 	// d1 + tight_fit_diam_diff
 
-thin_wall = 0.9; // depends on the print width
+thin_wall = 1.0; // depends on the print width
 thick_wall = 2*thin_wall + loose_fit_diam_diff/2;
 	// motor_diam + 2*thick_wall is the outer diameter of the rocket
 motor_wall = thick_wall; // above the motor
 
 clip_height = 3.5;
-clip_clearance = segment_overlap/4;
+clip_width = 1.2;
+clip_clearance = 1.0;
 clip_inner_space = motor_diam/2 - 1.5;
 
 rod_diam = 3.4 + 1;
 rubber_beam_height = 3;
+rubber_beam_width = 1.5;
 
 fin_thickness = 1;
 
 eps = 0.01;
-infty = 1000;
+infty = 250;
 
 //----------------- MOTOR MODULE -----------------------------
 
@@ -112,10 +114,10 @@ module motor_module_solid()
 	};
 
 	// motor clip
-	rotate([0, 0, 120]) intersection() {
+	for (angle = [120, -120]) rotate([0, 0, angle]) intersection() {
 		translate([clip_inner_space, -infty/2,
 			motor_len + motor_wall + clip_clearance])
-			cube([thin_wall, infty, clip_height]);
+			cube([clip_width, infty, clip_height]);
 		rotate([0, 0, -60])
 			translate([-infty/2, 0, 0]) cube(infty);
 		rotate([0, 0, -120])
@@ -157,11 +159,12 @@ module motor_module() {
 
 // -------------------- CENTRAL TUBE ---------------------
 
-central_tube_h = 85;
+central_tube_h = 97;
 
 central_clip_r = 12;
 central_clip_w = 4;
-central_clip_clearance = 1.5;
+central_clip_wall = 1.5;
+central_clip_clearance = 2.5;
 
 module central_tube_solid() {
 	cylinder(r = motor_diam/2 + thick_wall, h = central_tube_h);
@@ -187,7 +190,7 @@ module central_tube() {
 			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 - thin_wall, h = central_clip_w + 2*eps);
+				cylinder(r = central_clip_r - central_clip_wall, h = central_clip_w + 2*eps);
 		}
 	};
 };
@@ -217,7 +220,7 @@ module front_cone_body() {
 	translate([0, 0, segment_overlap])
 		bezier_cone([
 			[ 0, motor_diam/2 + thick_wall ], // start
-			[ cone_h/2, motor_diam/2 + thick_wall ], // cp 1
+			[ cone_h/4, motor_diam/2 + thick_wall ], // cp 1
 			[ cone_h - motor_diam/2 - thick_wall, motor_diam/2 + thick_wall ], // cp 2
 			[ cone_h, 0 ],
 		], 40);
@@ -237,7 +240,7 @@ module front_cone() {
 			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/4-0.7*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);
@@ -257,36 +260,27 @@ module front_cone() {
 	intersection() {
 		cylinder(r = motor_diam/2 + thin_wall/2, h = segment_overlap);
 		translate([motor_diam/3-thin_wall/2, -infty/2,
-			segment_overlap - rubber_beam_height/2 - eps])
-			cube([thin_wall, infty, rubber_beam_height]);
+			segment_overlap - thick_wall - rubber_beam_height - eps])
+			cube([rubber_beam_width, infty, rubber_beam_height]);
 	};
 };
 
-module thread_holder() {
-	rotate([0, 90, 0]) {
-		translate([0, 0, -1.5]) difference() {
-			cylinder(r = 10, h = 3);
-			translate([0, 0, -eps])
-				cylinder(r = 8, h = 3 + 2*eps);
-		};
-	};
-}
-
-// thread_holder();
+debug = 0;
 
-/*
+if (debug == 1) {
 // debug
-difference() {
-	// front_cone();
+difference($fn = 16) {
+	front_cone();
 	// central_tube();
-	motor_module();
+	// motor_module();
 
-	translate([0, 0, -eps]) cube(infty);
+	translate([0, 0, -infty/2]) cube(infty);
 };
-*/
+
+} else {
 
 // production
-$fn = 128;
+assign($fn = 128) {
 
 translate([motor_diam + thick_wall, 0, 0])
 	motor_module();
@@ -298,3 +292,6 @@ translate([motor_diam + thick_wall, 0, 0])
 rotate([0, 0, 240])
 translate([motor_diam + thick_wall, 0, 0])
 	front_cone();
+
+}
+}