3 // use shell thickness 1.50
4 // use fill density 40%
8 tube_dia = 27.5 + 1.625;
13 lockshaft_dia = 14.35;
27 mountscrew_dia = 4 + 0.5;
28 clipbolt_dia = 5 + 0.6;
30 mountscrew_washer = 10;
38 tube_rear_extra_th = 1;
40 divide_shaft_w = 1.75;
42 divide_head_dx = 1.75;
48 divide_fudge_r = 4.75;
51 backflange_angle = 20;
55 lockshaft_r = [1, 1] * lockshaft_dia / 2;
58 tube_or = tube_dia/2 + tube_th;
59 back_ohw = back_gap/2 + backflange_th;
60 backflange_ymin = tube_or+backflange_d;
62 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
63 lock_0x = lock_w/2 - lock_d/2;
64 lock_0 = [lock_0x,lock_0y];
66 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
68 module oval(sz){ // sz[0] > sz[1]
73 translate([sx * (xr-yr), 0])
80 // http://mathworld.wolfram.com/Circle-CircleIntersection.html
81 R = tube_or + join_cr;
82 r = lock_or[1] + join_cr;
83 d = dist2d( [0,0], lock_0 );
84 x = (d*d - r*r + R*R) / (2*d);
85 y = sqrt( R*R - x*x );
87 echo(lock_0x, lock_0y, R,r, d, x,y);
91 rotate(atan2(lock_0y, lock_0x)) {
99 module DividePlan(xl=10){
102 l = divide_shaft_l + g;
103 t = divide_head_th + g;
105 for (m=[0,1]) mirror([m,0]) {
106 translate([w, 0]) square([xl, g]);
107 for (i=[0:divide_heads-1]) {
108 translate([w, i*(l + t)]) {
109 translate([0, 0]) square([g, l + g]);
110 translate([0, l]) square([divide_head_dx + g, g]);
111 translate([dx, l]) square([g, t + g]);
112 translate([0, l + t])
113 square([divide_head_dx + g, g]);
116 translate([-0.1, (l + t) * divide_heads])
121 module DividePlanInPlace(xl=10){
122 rotate([0,0, -divide_angle])
123 translate([ -tube_dia/2 -tube_th/2 - divide_fudge_r, 0])
133 for (t=[0, tube_rear_extra_th])
137 rotate([0,0, backflange_angle])
138 translate([-back_ohw,0]) mirror([0,1])
139 square([back_ohw*2, backflange_ymin]);
141 translate([0, lock_0y]){
147 polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
151 rotate([0,0, backflange_angle])
152 translate([-back_gap/2,1]) mirror([0,1])
153 square([back_gap, backflange_ymin+2]);
160 DividePlanInPlace(0.1);
161 circle(divide_around);
165 translate([0, lock_0y]){
166 oval([lock_w/2, lock_d/2]);
169 circle(r = tube_dia/2);
175 lockshaft_or = lockshaft_r + [clip_th,clip_th];
176 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
177 clip_ymin = cliprecess_ymax - total_h;
178 clip_ogap = clip_gap + clip_th*2;
180 module ClipElevationPositive(){
183 translate([0, -lockshaft_or[1] * sqrt(2)])
184 square(center=true, 0.5);
186 translate([-lockshaft_or[0], 0])
187 square([lockshaft_or[0]*2, cliprecess_ymax]);
188 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
191 module ClipElevationNegative(){
193 for (y=[0, cliprecess_ymax+1])
197 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
200 module ClipElevation(){
202 ClipElevationPositive(1);
203 ClipElevationNegative(0);
207 module ExtrudeClipElevation(extra=0){
209 lock_0y + lock_d/2 + clip_d + extra,
212 linear_extrude(height= clip_d + extra*2, convexity=100)
216 module ThroughHole(r, y, z, x=-50) {
219 cylinder(r=r, h=100, $fn=20);
222 module MountingHoleCylinders(r, x=-50){
223 for (z=[ 1/4, 3/4 ]) {
224 rotate([0,0, backflange_angle])
226 -tube_or -0.5*backflange_d,
232 module ThroughHoles(){
233 MountingHoleCylinders(mountscrew_dia/2);
235 ThroughHole( clipbolt_dia/2,
236 lock_0y + lock_d/2 + clip_d/2 + front_th/2,
237 total_h - cliprecess_h - clip_th - clip_d/2 );
240 module MainPositive(){
243 linear_extrude(height=total_h, convexity=100) MainPlan();
244 ExtrudeClipElevation() ClipElevationPositive();
246 ExtrudeClipElevation(1) ClipElevationNegative();
250 module Bracket(){ ////toplevel
257 module TestTopEdge(){ ////toplevel
259 translate([0,0, -total_h])
262 translate([-200,-200,0])
267 module TestClipBoltHole(){ ////toplevel
270 translate([0, 0, -5])
272 translate([-4, lock_0y + lock_d/2 + 1, 0])
275 translate([-200, lock_0y + lock_d/2 + 0.1])
276 cube([400, 400, total_h-20]);
280 module Demo(){ ////toplevel
282 color("blue") MountingHoleCylinders(mountscrew_dia/2 - 0.1);
283 color("black") MountingHoleCylinders(mountscrew_washer/2,
288 //ClipElevationPositive();
293 //TestClipBoltHole();