// -*- C -*-
-tube_dia = 27.5 + 2.00;
+// use shell thickness 1.50
+// use fill density 40%
+
+include <funcs.scad>
+
+tube_dia = 27.5 + 1.625;
lock_w = 42.5 + 0.5;
lock_d = 28.0 + 0.5;
main_h = 45.0;
backflange_d = 12;
-lockshaft_dia = 15.5;
+lockshaft_dia = 14.35;
cliprecess_h = 16;
total_h = 45;
-back_gap = 10;
-main_th = 2.5;
-tube_th = 2.25;
+back_gap = 12.5;
+main_th = 2.75;
+tube_th = 2.125;
midweb_d = 3;
clip_th = 3.5;
mountscrew_dia = 4 + 0.5;
clipbolt_dia = 5 + 0.1;
-backflange_th = 3.5;
+backflange_th = 4.5;
$fn=50;
+join_cr = 9;
+
+tube_rear_extra_th = 1;
+
// calculated
lockshaft_r = [1, 1] * lockshaft_dia / 2;
backflange_ymin = tube_or+backflange_d;
lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
+lock_0x = lock_w/2 - lock_d/2;
+lock_0 = [lock_0x,lock_0y];
lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
}
}
+module JoinCircs(jr){
+ // http://mathworld.wolfram.com/Circle-CircleIntersection.html
+ R = tube_or + join_cr;
+ r = lock_or[1] + join_cr;
+ d = dist2d( [0,0], lock_0 );
+ x = (d*d - r*r + R*R) / (2*d);
+ y = sqrt( R*R - x*x );
+
+ echo(lock_0x, lock_0y, R,r, d, x,y);
+
+ for (m=[0,1]) {
+ mirror([m,0]) {
+ rotate(atan2(lock_0y, lock_0x)) {
+ translate([x,-y])
+ circle(r= jr);
+ }
+ }
+ }
+}
+
module MainPlan(){
difference(){
union(){
- circle(r = tube_or);
+ hull(){
+ for (t=[0, tube_rear_extra_th])
+ translate([0, -t])
+ circle(r = tube_or);
+ }
translate([-back_ohw,0]) mirror([0,1])
square([back_ohw*2, backflange_ymin]);
+
+ translate([0, lock_0y]){
+ oval(lock_or);
+ }
+
+ hull(){
+ JoinCircs(0.01);
+ polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
+ }
}
+
circle(r = tube_dia/2);
translate([-back_gap/2,1]) mirror([0,1])
square([back_gap, backflange_ymin+2]);
- }
- translate([0, lock_0y]){
- difference(){
- union(){
- oval(lock_or);
- }
+
+ translate([0, lock_0y]){
oval([lock_w/2, lock_d/2]);
}
+
+ JoinCircs(join_cr);
}
}
//TestTopEdge();
//TestClipBoltHole();
-//Bracket();
+Bracket();