5 tube_dia = 27.5 + 1.625;
10 lockshaft_dia = 14.35;
24 mountscrew_dia = 4 + 0.5;
25 clipbolt_dia = 5 + 0.1;
33 tube_rear_extra_th = 1;
37 lockshaft_r = [1, 1] * lockshaft_dia / 2;
40 tube_or = tube_dia/2 + tube_th;
41 back_ohw = back_gap/2 + backflange_th;
42 backflange_ymin = tube_or+backflange_d;
44 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
45 lock_0x = lock_w/2 - lock_d/2;
46 lock_0 = [lock_0x,lock_0y];
48 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
50 module oval(sz){ // sz[0] > sz[1]
55 translate([sx * (xr-yr), 0])
62 # http://mathworld.wolfram.com/Circle-CircleIntersection.html
63 R = tube_or + join_cr;
64 r = lock_or[1] + join_cr;
65 d = dist2d( [0,0], lock_0 );
66 x = (d*d - r*r + R*R) / (2*d);
67 y = sqrt( R*R - x*x );
69 echo(lock_0x, lock_0y, R,r, d, x,y);
73 rotate(atan2(lock_0y, lock_0x)) {
85 for (t=[0, tube_rear_extra_th])
89 translate([-back_ohw,0]) mirror([0,1])
90 square([back_ohw*2, backflange_ymin]);
92 translate([0, lock_0y]){
98 polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
102 circle(r = tube_dia/2);
103 translate([-back_gap/2,1]) mirror([0,1])
104 square([back_gap, backflange_ymin+2]);
106 translate([0, lock_0y]){
107 oval([lock_w/2, lock_d/2]);
114 lockshaft_or = lockshaft_r + [clip_th,clip_th];
115 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
116 clip_ymin = cliprecess_ymax - total_h;
117 clip_ogap = clip_gap + clip_th*2;
119 module ClipElevationPositive(){
122 translate([0, -lockshaft_or[1] * sqrt(2)])
123 square(center=true, 0.5);
125 translate([-lockshaft_or[0], 0])
126 square([lockshaft_or[0]*2, cliprecess_ymax]);
127 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
130 module ClipElevationNegative(){
132 for (y=[0, cliprecess_ymax+1])
136 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
139 module ClipElevation(){
141 ClipElevationPositive(1);
142 ClipElevationNegative(0);
146 module ExtrudeClipElevation(extra=0){
148 lock_0y + lock_d/2 + clip_d + extra,
151 linear_extrude(height= clip_d + extra*2, convexity=100)
155 module ThroughHole(r, y, z) {
156 translate([-50, y, z])
158 cylinder(r=r, h=100, $fn=20);
161 module ThroughHoles(){
162 for (z=[ 1/4, 3/4 ]) {
163 ThroughHole( mountscrew_dia/2,
164 -tube_or -0.5*backflange_d,
168 ThroughHole( clipbolt_dia/2,
169 lock_0y + lock_d/2 + clip_d/2 + front_th/2,
170 total_h - cliprecess_h - clip_th - clip_d/2 );
173 module MainPositive(){
176 linear_extrude(height=total_h, convexity=100) MainPlan();
177 ExtrudeClipElevation() ClipElevationPositive();
179 ExtrudeClipElevation(1) ClipElevationNegative();
183 module Bracket(){ //// toplevel
190 module TestTopEdge(){ //// toplevel
192 translate([0,0, -total_h])
195 translate([-200,-200,0])
200 module TestClipBoltHole(){ //// toplevel
203 translate([0, 0, -5])
205 translate([-4, lock_0y + lock_d/2 + 1, 0])
208 translate([-200, lock_0y + lock_d/2 + 0.1])
209 cube([400, 400, total_h-20]);
214 //ClipElevationPositive();
219 //TestClipBoltHole();