see bottom for more license info */
/* spin thing that erin likes */
-$fn = 500;
+$fn = 50;
+
+layer_height = 0.35;
weight = "penny";
// weight = "608zz";
bearing = "608zz";
-wall_thickness = 2;
-_608zz_radius = 22;
-penny_radius = 19.05 / 2;
+weight_lip_overhang = 0.3;
+bearing_lip_overhang = weight_lip_overhang;
+wall = 3;
penny_thickness = 1.52;
+penny_radius = 19.05 / 2;
+
+_608zz_radius = 22 / 2;
+_608zz_inner_radius = 8.1 / 2;
+_608zz_cover_radius = _608zz_radius;
+_608zz_cap_footprint_radius = 12 / 2;
+_608zz_thickness = 7;
+
weight_radius = (weight == "penny") ? penny_radius : _608zz_radius;
+weight_thickness = (weight == "penny") ?
+ penny_thickness * 5 : _608zz_thickness;
+
bearing_radius = (bearing == "608zz") ? _608zz_radius : 1/0;
+bearing_window_radius = bearing_radius - bearing_lip_overhang - 1;
+bearing_inner_radius = (bearing == "608zz") ? _608zz_inner_radius : 1/0;
+bearing_cover_radius = (bearing == "608zz")
+ ? _608zz_cover_radius
+ : 1/0;
+bearing_cap_footprint_radius =
+ (bearing == "608zz") ? _608zz_cap_footprint_radius : 1/0;
+bearing_thickness = (bearing == "608zz") ? _608zz_thickness : 1/0;
+
+spinner_height = penny_thickness * 5 + 2;
arms = 3;
-module spin(weight_radius,
- arms,
- wall_thickness,
- bearing_radius) {
- bearing_holder_radius = bearing_radius + wall_thickness;
- weight_holder_radius = weight_radius + wall_thickness;
-
- circle(bearing_holder_radius);
-
- /*
- * imagine a right triangle with one point at the origin, at the
- * center of the spinning bearing holder, one point in the middle of
- * the weight holder, and one point at the center of a circle tangent
- * to the first two, called the joiner circle.
- * the radius of the joiner circle is the arithmetic average of the
- * weight holder and bearing holder.
- */
- joiner_radius = (bearing_holder_radius + weight_holder_radius) / 2;
- /* a: goes between the center of the weight holder and the center of
- the joiner circle. */
- a = joiner_radius + weight_holder_radius;
- /* b: length of the base, which goes along the x-axis between
- the origin and the center of the weight holder. */
- b = weight_holder_radius + bearing_holder_radius;
- /* c: goes between origin and joiner circle. */
- c = bearing_holder_radius + joiner_radius;
-
- /* A: angle at the origin, between the base and hypotenuse.
- it is calculated using law of cosines, given the lengths of
- all 3 sides of the triangle. */
- A = acos((pow(b, 2) + pow(c, 2) - pow(a, 2)) / (2 * b * c));
- /* find the center of the joiner circle */
- joiner_x = cos(A) * c;
- joiner_y = sin(A) * c;
-
- /* find the points where the circles meet */
- bearing_joiner_point = [cos(A) * bearing_holder_radius,
- sin(A) * bearing_holder_radius];
- bearing_weight_point = [bearing_holder_radius, 0];
- /* C: angle between x-axis and line-segment between center of weight
- holder and center of joiner.
- it is calculated using law of cosines, given the lengths of
- all 3 sides of the triangle. */
- C = acos((pow(a, 2) + pow(b, 2) - pow(c, 2)) / (2 * a * b));
- weight_joiner_point = [b - cos(C) * weight_holder_radius,
- sin(C) * weight_holder_radius];
+module cap(bearing_inner_radius,
+ bearing_cap_footprint_radius,
+ bearing_cover_radius,
+ bearing_thickness,
+ bearing_window_radius) {
+ footprint_height = 4.5;
+ footprint_radius_safety = 0.2;
+ cap_height = 3;
+ bearing_thickness_safety = 0.6;
+ finger_spot_height = cap_height / 10;
+
+ difference() {
+ union() {
+ cylinder(r1 = bearing_cover_radius - tan(30) * cap_height,
+ r2 = bearing_cover_radius,
+ h = cap_height);
+ linear_extrude(height = cap_height
+ + footprint_height
+ - 1.05) {
+ circle(bearing_window_radius - 1); }
+ linear_extrude(height = cap_height + footprint_height) {
+ circle(bearing_cap_footprint_radius - footprint_radius_safety); }
+ linear_extrude(height = cap_height
+ + footprint_height
+ + bearing_thickness / 2
+ - bearing_thickness_safety) {
+ circle(bearing_inner_radius); }
+ }
+ translate([0, 0, -0.01]) {
+ cylinder(r1 = bearing_inner_radius,
+ r2 = bearing_inner_radius - tan(30) * finger_spot_height,
+ h = finger_spot_height); } } }
+
+module donut(height, footprint_radius) {
+ bread_radius = height / 2;
+ rotate_extrude() {
+ translate([footprint_radius, 0]) {
+ circle(bread_radius); } } }
+
+module donut_hole(height, footprint_radius) {
+ difference() {
+ cylinder(r = footprint_radius, h = height, center = true);
+ donut(height, footprint_radius); } }
+
+module jelly_filled(height, footprint_radius) {
+ cylinder(r = footprint_radius, h = height, center = true);
+ donut(height, footprint_radius); }
+
+module fillet(r) {
+ offset(r = -r) { offset(delta = r) { children(); } } }
+
+module mirrored(axis) {
+ children();
+ mirror(axis) children(); }
+
+module spin_slice(weight_radius,
+ bearing_radius,
+ round_extra,
+ wall,
+ arms) {
+ joiner_radius = (bearing_radius + weight_radius) / 2;
+
+ bearing_xy = [0, 0];
+ // a = side along x axis
+ a = bearing_radius + weight_radius + wall;
+ // b = side from center to joiner
+ b = bearing_radius + joiner_radius + round_extra;
+ // c = side between joiner and arm center
+ c = joiner_radius + weight_radius + round_extra;
+
+ weight_xy = [a, 0];
+
+ cos_C = (pow(a, 2) + pow(b, 2) - pow(c, 2)) / (2 * a * b);
+ sin_C = sqrt(1 - pow(cos_C, 2));
+
+ joiner_xy = [cos_C, sin_C] * b;
+
for(arm = [0 : arms - 1]) {
- rotate(arm * 360.0 / arms) {
+ rotate(arm * (360 / arms)) {
difference() {
- polygon([bearing_weight_point,
- bearing_joiner_point,
- weight_joiner_point]);
- translate([joiner_x, joiner_y]) {
- circle(joiner_radius); } }
- mirror(v = [0, 1, 0]) {
- difference() {
- polygon([bearing_weight_point,
- bearing_joiner_point,
- weight_joiner_point]);
- translate([joiner_x, joiner_y]) {
- circle(joiner_radius); } } }
- translate([weight_holder_radius + bearing_holder_radius, 0]) {
- circle(weight_holder_radius); } } } }
+ union() {
+ translate(bearing_xy) {
+ circle(bearing_radius + round_extra); }
+ translate(weight_xy) {
+ circle(weight_radius + round_extra); }
+ mirrored([0, 1]) {
+ polygon([bearing_xy, weight_xy, joiner_xy]); } }
+ mirrored([0, 1]) {
+ translate(joiner_xy) {
+ circle(joiner_radius); } } } } } }
+
+module spin_slices(weight_radius,
+ weight_thickness,
+ bearing_radius,
+ bearing_thickness,
+ weight_lip_overhang = 0.3,
+ bearing_lip_overhang = 0.3,
+ wall = 3,
+ arms = 3,
+ layer_height = 0.15) {
+ thicker_thickness = (bearing_thickness > weight_thickness) ?
+ bearing_thickness : weight_thickness;
+ calculated_height = thicker_thickness + 2 * wall;
+ layers = 2 * ceil(ceil(calculated_height / layer_height) / 2);
+ actual_height = layers * layer_height;
+ round_radius = actual_height / 2;
+
+ /* rounding the outside edge of the spinner with a semi-circle leads
+ to a shape that an overhang on the second layer several times the
+ thickness of a printed extrusion width.
+
+ rather than using a full semi-circle, this code aims to use just the
+ portion in the middle, where the overhang is less severe */
+ old_start = 0;
+ old_end = (layers / 2) - 1;
+
+ /* add one to have some thickness all around weight holes
+ for first layer */
+ new_start = old_end / 16 + 1;
+ new_end = old_end;
+
+ old_range = old_end - old_start;
+ new_range = new_end - new_start;
+
+ factor = new_range / old_range;
+
+ /* initial adjacent is adjusted to (new start - 1) to allow some
+ thickness all around weight holes on first layer */
+ initial_adjacent = round_radius - ((new_start - 1) * layer_height);
+ initial_angle = acos(initial_adjacent / round_radius);
+ initial_round_extra = initial_adjacent * tan(initial_angle);
+
+ difference() {
+ mirrored([0, 0, 1]) {
+ for(layer = [0 : (layers / 2) - 1]) {
+ translate([0, 0, layer * layer_height - actual_height / 2]) {
+ linear_extrude(height = layer_height) {
+ new_layer = (layer - old_start) * factor + new_start;
+ adjacent = round_radius - (new_layer * layer_height);
+ angle = acos(adjacent / round_radius);
+ round_extra = adjacent * tan(angle) - initial_round_extra;
+ spin_slice(weight_radius,
+ bearing_radius,
+ round_extra,
+ wall,
+ arms); } } } }
+ cylinder(h = actual_height + 0.1,
+ r = bearing_radius - bearing_lip_overhang,
+ center = true);
+ cylinder(h = bearing_thickness + 0.05,
+ r = bearing_radius + 0.15,
+ center = true);
+ for(arm = [0 : arms - 1]) {
+ rotate(arm * (360 / arms)) {
+ translate([bearing_radius + wall + weight_radius, 0]) {
+ cylinder(h = actual_height + 0.1,
+ r = weight_radius - weight_lip_overhang,
+ center = true);
+ cylinder(h = weight_thickness + 0.05,
+ r = weight_radius + 0.15,
+ center = true); } } } } }
/*
This file is part of 3d-printables.
projects / ozzloy@gmail.com / 3d-printables / blobdiff