From: Jan "Yenya" Kasprzak Date: Sun, 29 Jun 2014 22:29:14 +0000 (+0200) Subject: rocket.scad: new version X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=commitdiff_plain;h=514a995eff152ea18492088ebb3f0fa0c8c8bdae;p=things.git rocket.scad: new version - tight and loose connection between the parts - new rubberband holder in the middle part - new motor clip - rubber band holder in the head cone moved higher --- diff --git a/rocket.scad b/rocket.scad index 3649fe1..da12f93 100644 --- a/rocket.scad +++ b/rocket.scad @@ -4,19 +4,30 @@ motor_diam = 17.7 + 0.5; // add some tolerance motor_len = 69.5 + 0.5; -motor_wall = 2; segment_overlap = 15; +loose_fit_diam_diff = 0.5; // 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 + // will fit tightly into the hole with inner diameter + // d1 + tight_fit_diam_diff + thin_wall = 0.9; // depends on the print width -thick_wall = 2.2*thin_wall; +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_spring_angle = 45; -clip_spring_depth = 20; +clip_height = 3.5; +clip_clearance = segment_overlap/4; +clip_inner_space = motor_diam/2 - 1.5; rod_diam = 3.4 + 1; rubber_beam_height = 3; +fin_thickness = 1; + eps = 0.01; infty = 1000; @@ -27,7 +38,7 @@ module fin() { h2 = 20, // far end height h_off = motor_len, // height offset of the far height w = 30, // distance of the far height - fin_w = thin_wall) + fin_w = fin_thickness) translate([0, -fin_w/2, -h1]) hull() { cube([eps, fin_w, h1]); // near end @@ -42,7 +53,7 @@ module fin2() { 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) + fin_w = fin_thickness) translate([0, -fin_w/2, -h1]) hull() { cube([eps, fin_w, h1]); // near end @@ -51,49 +62,32 @@ module fin2() { }; }; -rod_hole_height = 15; +rod_hole_height = 20; rod_hole_side = 1.5*(rod_diam + thin_wall); module motor_module_solid() { - // the lowest part is for joining the segments - cylinder(r = motor_diam/2 + thin_wall, h = segment_overlap + eps); + // cone from loose_fit to tight fit, 1/3 of segment overlap + cylinder(r1 = motor_diam/2 + thin_wall, + r2 = motor_diam/2 + thick_wall - thin_wall - tight_fit_diam_diff/2, + h = segment_overlap/3 + eps); + + // tight fit cylinder, 2/3 of segment overlap + translate([0, 0, segment_overlap/3]) + cylinder(r = motor_diam/2 + thick_wall - thin_wall - tight_fit_diam_diff/2, + h = 2*segment_overlap/3 + eps); // conical joint between the two cylinders translate([0, 0, segment_overlap - thick_wall + thin_wall]) - cylinder(r1 = motor_diam/2 + thin_wall, + cylinder(r1 = motor_diam/2 + thick_wall - thin_wall - tight_fit_diam_diff/2, r2 = motor_diam/2 + thick_wall, h = thick_wall - thin_wall + eps); - // protrusions to hold the main tube in place - for (a = [60, 180, 300]) { - rotate([0, 0, a]) { - translate([motor_diam/2 + thick_wall - thin_wall/2 - thick_wall, 0, 0]) - cylinder(r1 = thick_wall-thin_wall/2, r2 = thick_wall, h = segment_overlap/3 + eps); - translate([motor_diam/2 + thick_wall - thin_wall/2 - thick_wall, 0, segment_overlap/3]) - cylinder(r = thick_wall, h = 2*segment_overlap/3 + eps); - }; - }; - // the thick cylinder above it translate([0, 0, segment_overlap]) cylinder(r = motor_diam/2 + thick_wall, h = motor_len + motor_wall - segment_overlap); - // clip spring - translate([0, 0, motor_len + motor_wall]) - intersection() { - translate([motor_diam/2+6, infty/2, 4]) - rotate([90, 0, 0]) - cylinder(r = 8, h = infty); - cylinder(r = motor_diam/2 + thick_wall, h = infty); - rotate([0, 0, -clip_spring_angle/2+eps]) - cube(infty); - rotate([0, 0, clip_spring_angle/2-eps]) - scale([1, -1, 1]) - cube([infty, infty, 8]); - }; - // fins for (a = [60, 180, 300]) { rotate([0, 0, a]) @@ -108,7 +102,7 @@ module motor_module_solid() 0, segment_overlap]) scale([1, 1.4, 1]) cylinder(r = rod_diam/2 + thin_wall, h = eps); - translate([motor_diam/2 + thick_wall + rod_diam/2, 0, segment_overlap + rod_hole_side]) + 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, @@ -117,6 +111,16 @@ module motor_module_solid() cylinder(r = rod_diam/2 + thin_wall, h = eps); }; + // motor clip + rotate([0, 0, 120]) intersection() { + translate([clip_inner_space, -infty/2, + motor_len + motor_wall + clip_clearance]) + cube([thin_wall, infty, clip_height]); + rotate([0, 0, -60]) + translate([-infty/2, 0, 0]) cube(infty); + rotate([0, 0, -120]) + translate([-infty/2, 0, 0]) cube(infty); + }; }; module motor_module() { @@ -145,26 +149,8 @@ module motor_module() { cylinder(r = 3, h = infty); }; - // clip spring - for (r = [-clip_spring_angle/2, clip_spring_angle/2]) { - rotate([0, 0, r]) - translate([-thin_wall/2, 0, motor_len + motor_wall - clip_spring_depth]) - cube([infty, thin_wall, infty]); - }; - translate([0, 0, motor_len - eps]) - intersection() { - cylinder(r = motor_diam/2, - h = thick_wall + 2*eps); - rotate([0, 0, -clip_spring_angle/2+eps]) - cube(infty); - rotate([0, 0, clip_spring_angle/2-eps]) - scale([1, -1, 1]) - cube([infty, infty, 8]); - }; - - // rod hole - translate([motor_diam/2 + thick_wall + eps + rod_diam/2, 0, 0]) + translate([motor_diam/2 + thick_wall + thin_wall + eps + rod_diam/2, 0, 0]) cylinder(r = rod_diam/2, h = infty); }; }; @@ -173,6 +159,10 @@ module motor_module() { central_tube_h = 85; +central_clip_r = 12; +central_clip_w = 4; +central_clip_clearance = 1.5; + module central_tube_solid() { cylinder(r = motor_diam/2 + thick_wall, h = central_tube_h); }; @@ -187,9 +177,18 @@ module central_tube() { // 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 - thin_wall, h = central_clip_w + 2*eps); + } }; }; @@ -258,7 +257,7 @@ 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/2 - rubber_beam_height/2]) + segment_overlap - rubber_beam_height/2 - eps]) cube([thin_wall, infty, rubber_beam_height]); }; };