// -*- C -*-
+// use shell thickness 1.50
+// use fill density 40%
+
include <funcs.scad>
tube_dia = 27.5 + 1.625;
cliprecess_h = 16;
total_h = 45;
-back_gap = 11;
-main_th = 2.75;
-tube_th = 2.25;
+back_gap = 12.5;
+main_th = 3.50;
+tube_th = 4.00;
midweb_d = 3;
clip_th = 3.5;
clip_d = 22.0;
mountscrew_dia = 4 + 0.5;
-clipbolt_dia = 5 + 0.1;
+clipbolt_dia = 5 + 0.6;
backflange_th = 4.5;
$fn=50;
-join_cr = 7;
+join_cr = 9;
tube_rear_extra_th = 1;
+divide_shaft_w = 1.75;
+divide_shaft_l = 1.5;
+divide_head_dx = 1.75;
+divide_head_th = 1.5;
+divide_gap = 0.50;
+divide_heads = 2;
+
+divide_angle = 26;
+divide_fudge_r = 4.75;
+divide_around = 3.5;
+
+backflange_angle = 20;
+
// calculated
lockshaft_r = [1, 1] * lockshaft_dia / 2;
}
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 );
}
}
+module DividePlan(xl=10){
+ w = divide_shaft_w;
+ g = divide_gap;
+ l = divide_shaft_l + g;
+ t = divide_head_th + g;
+ dx = divide_head_dx;
+ for (m=[0,1]) mirror([m,0]) {
+ translate([w, 0]) square([xl, g]);
+ for (i=[0:divide_heads-1]) {
+ translate([w, i*(l + t)]) {
+ translate([0, 0]) square([g, l + g]);
+ translate([0, l]) square([divide_head_dx + g, g]);
+ translate([dx, l]) square([g, t + g]);
+ translate([0, l + t])
+ square([divide_head_dx + g, g]);
+ }
+ }
+ translate([-0.1, (l + t) * divide_heads])
+ square([w + g, g]);
+ }
+}
+
+module DividePlanInPlace(xl=10){
+ rotate([0,0, -divide_angle])
+ translate([ -tube_dia/2 -tube_th/2 - divide_fudge_r, 0])
+ DividePlan(xl);
+}
+
module MainPlan(){
difference(){
union(){
- 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);
+ difference(){
+ union(){
+ hull(){
+ for (t=[0, tube_rear_extra_th])
+ translate([0, -t])
+ circle(r = tube_or);
+ }
+ rotate([0,0, backflange_angle])
+ 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]]]);
+ }
+ }
+
+ rotate([0,0, backflange_angle])
+ translate([-back_gap/2,1]) mirror([0,1])
+ square([back_gap, backflange_ymin+2]);
+
+ JoinCircs(join_cr);
}
hull(){
- JoinCircs(0.01);
- polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
+ minkowski(){
+ DividePlanInPlace(0.1);
+ circle(divide_around);
+ }
}
}
-
- circle(r = tube_dia/2);
- translate([-back_gap/2,1]) mirror([0,1])
- square([back_gap, backflange_ymin+2]);
-
translate([0, lock_0y]){
oval([lock_w/2, lock_d/2]);
}
- JoinCircs(join_cr);
+ circle(r = tube_dia/2);
+
+ DividePlanInPlace();
}
}
module ThroughHoles(){
for (z=[ 1/4, 3/4 ]) {
- ThroughHole( mountscrew_dia/2,
- -tube_or -0.5*backflange_d,
- total_h * z );
+ rotate([0,0, backflange_angle])
+ ThroughHole( mountscrew_dia/2,
+ -tube_or -0.5*backflange_d,
+ total_h * z );
}
ThroughHole( clipbolt_dia/2,
}
}
-module Bracket(){ //// toplevel
+module Bracket(){ ////toplevel
difference(){
MainPositive();
ThroughHoles();
}
}
-module TestTopEdge(){ //// toplevel
+module TestTopEdge(){ ////toplevel
intersection(){
translate([0,0, -total_h])
translate([0,0, 4])
}
}
-module TestClipBoltHole(){ //// toplevel
+module TestClipBoltHole(){ ////toplevel
intersection(){
union(){
translate([0, 0, -5])
//%ThroughHoles();
//TestTopEdge();
//TestClipBoltHole();
+//DividePlan();
//Bracket();
+