// -*- C -*-
-arch_height = 24;
+arch_height = 18;
arch_width = 75;
end_width = 25;
-arch_thick = 5;
+arch_thick = 4;
arch_breadth = 25;
-hole_dia = 3 + 0.5;
+hole_dia = 4 + 0.5;
+
+pbase_tab = 12;
+pbase_thick = 2;
// computed
end_thick = arch_thick;
holes = [[[ 5 , 5 ], [16 , 21]], // left
- [[ 18.5, 4.5], [ 4.5, 22]]]; // right
+ [[ 18.5, 4.5], [ 4.5, 21]]]; // right
module ArchCircle(rad){
translate([0,-arch_to_chord])
circle(rad, $fa=0.1);
}
-module ArchProfile(){
+module ArchProfile(pbase){
intersection(){
translate([-200,0])
square([400,200]);
for (m=[0,1])
mirror([m,0])
translate([arch_width/2,0])
- square([end_width, end_thick]);
+ multmatrix([[1,pbase ? -0.75 : 0,0,0],
+ [0,1,0,0],
+ [0,0,1,0],
+ [0,0,0,1]])
+ square([end_width, pbase ? pbase_tab : end_thick]);
}
- ArchCircle(arch_in_rad);
}
}
}
module Arch(){
difference(){
- rotate([0,0,180])
- linear_extrude(height=arch_breadth) ArchProfile();
+ rotate([0,0,180]){
+ difference(){
+ union(){
+ linear_extrude(height=arch_breadth) ArchProfile(false);
+ linear_extrude(height=pbase_thick) hull(){
+ ArchProfile(true);
+ ArchProfile(false);
+ }
+ }
+ translate([0,0,-1]) linear_extrude(height=100)
+ ArchCircle(arch_in_rad);
+ }
+ }
Holes();
}
}
-Arch();
+rotate([0,0,45]) Arch();