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;
36 tube_rear_extra_th = 1;
47 lockshaft_r = [1, 1] * lockshaft_dia / 2;
50 tube_or = tube_dia/2 + tube_th;
51 back_ohw = back_gap/2 + backflange_th;
52 backflange_ymin = tube_or+backflange_d;
54 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
55 lock_0x = lock_w/2 - lock_d/2;
56 lock_0 = [lock_0x,lock_0y];
58 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
60 module oval(sz){ // sz[0] > sz[1]
65 translate([sx * (xr-yr), 0])
72 // http://mathworld.wolfram.com/Circle-CircleIntersection.html
73 R = tube_or + join_cr;
74 r = lock_or[1] + join_cr;
75 d = dist2d( [0,0], lock_0 );
76 x = (d*d - r*r + R*R) / (2*d);
77 y = sqrt( R*R - x*x );
79 echo(lock_0x, lock_0y, R,r, d, x,y);
83 rotate(atan2(lock_0y, lock_0x)) {
94 for (m=[0,1]) mirror([m,0]) {
95 translate([divide_shaft_w, 0]) square([10, g]);
96 for (i=[0:divide_heads-1]) {
97 translate([divide_shaft_w, i*(divide_shaft_l + divide_head_th)]) {
98 translate([0, 0]) square([g, divide_shaft_l + g]);
99 translate([0, divide_shaft_l]) square([divide_head_dx + g, g]);
100 translate([dx, divide_shaft_l]) square([g, divide_head_th + g]);
101 translate([0, divide_shaft_l + divide_head_th])
102 square([divide_head_dx + g, g]);
105 translate([-0.1, (divide_shaft_l + divide_head_th) * divide_heads])
106 square([divide_shaft_w + g, g]);
114 for (t=[0, tube_rear_extra_th])
118 translate([-back_ohw,0]) mirror([0,1])
119 square([back_ohw*2, backflange_ymin]);
121 translate([0, lock_0y]){
127 polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
131 circle(r = tube_dia/2);
132 translate([-back_gap/2,1]) mirror([0,1])
133 square([back_gap, backflange_ymin+2]);
135 translate([0, lock_0y]){
136 oval([lock_w/2, lock_d/2]);
143 lockshaft_or = lockshaft_r + [clip_th,clip_th];
144 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
145 clip_ymin = cliprecess_ymax - total_h;
146 clip_ogap = clip_gap + clip_th*2;
148 module ClipElevationPositive(){
151 translate([0, -lockshaft_or[1] * sqrt(2)])
152 square(center=true, 0.5);
154 translate([-lockshaft_or[0], 0])
155 square([lockshaft_or[0]*2, cliprecess_ymax]);
156 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
159 module ClipElevationNegative(){
161 for (y=[0, cliprecess_ymax+1])
165 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
168 module ClipElevation(){
170 ClipElevationPositive(1);
171 ClipElevationNegative(0);
175 module ExtrudeClipElevation(extra=0){
177 lock_0y + lock_d/2 + clip_d + extra,
180 linear_extrude(height= clip_d + extra*2, convexity=100)
184 module ThroughHole(r, y, z) {
185 translate([-50, y, z])
187 cylinder(r=r, h=100, $fn=20);
190 module ThroughHoles(){
191 for (z=[ 1/4, 3/4 ]) {
192 ThroughHole( mountscrew_dia/2,
193 -tube_or -0.5*backflange_d,
197 ThroughHole( clipbolt_dia/2,
198 lock_0y + lock_d/2 + clip_d/2 + front_th/2,
199 total_h - cliprecess_h - clip_th - clip_d/2 );
202 module MainPositive(){
205 linear_extrude(height=total_h, convexity=100) MainPlan();
206 ExtrudeClipElevation() ClipElevationPositive();
208 ExtrudeClipElevation(1) ClipElevationNegative();
212 module Bracket(){ //// toplevel
219 module TestTopEdge(){ //// toplevel
221 translate([0,0, -total_h])
224 translate([-200,-200,0])
229 module TestClipBoltHole(){ //// toplevel
232 translate([0, 0, -5])
234 translate([-4, lock_0y + lock_d/2 + 1, 0])
237 translate([-200, lock_0y + lock_d/2 + 0.1])
238 cube([400, 400, total_h-20]);
243 //ClipElevationPositive();
248 //TestClipBoltHole();