X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=brompton-computer-guard.scad;h=35b0a182b6e9849e80609278345c2121e857b2ee;hp=8b1fcb239b3ca5828ea8aa71810aa9c1bc04feb4;hb=55000fa41db8d2fb6c8aba14cc5e47148c8fc189;hpb=4ae94ff85f008a89f51204570db56f2b6fb20c1c

diff --git a/brompton-computer-guard.scad b/brompton-computer-guard.scad
index 8b1fcb2..35b0a18 100644
--- a/brompton-computer-guard.scad
+++ b/brompton-computer-guard.scad
@@ -1,17 +1,17 @@
 // -*- 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 = 15;
-pbase_thick = 2;
+pbase_tab = 12;
+pbase_thick = 4;
 
 // computed
 
@@ -21,10 +21,15 @@ echo(arch_alpha,arch_beta);
 arch_in_rad = arch_width/2 / sin(arch_beta);
 arch_to_chord = arch_in_rad * cos(arch_beta);
 
+inner_pbase_thick = 8;
+echo(inner_pbase_thick);
+
+inner_pbase_rad = arch_in_rad * 2;
+
 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])
@@ -63,23 +68,39 @@ module Holes(){
   }
 }
 
+module MainCutout(){
+  ArchCircle(arch_in_rad);
+}
+
 module Arch(){
   difference(){
     rotate([0,0,180]){
+      linear_extrude(height=arch_breadth) {
+	difference(){
+	  ArchProfile(false);
+	  MainCutout();
+	}
+      }
       difference(){
-	union(){
-	  linear_extrude(height=arch_breadth) ArchProfile(false);
-	  linear_extrude(height=pbase_thick) hull(){
-	    ArchProfile(true);
-	    ArchProfile(false);
+	translate([0,0, arch_breadth - pbase_thick])
+	linear_extrude(height=pbase_thick){
+	  difference(){
+	    hull(){
+	      ArchProfile(true);
+	      ArchProfile(false);
+	    }
+	    intersection(){
+	      MainCutout();
+	      translate([0, -inner_pbase_thick
+			 - (inner_pbase_rad - arch_in_rad)])
+		ArchCircle(inner_pbase_rad);
+	    }
 	  }
 	}
-	translate([0,0,-1]) linear_extrude(height=100)
-	  ArchCircle(arch_in_rad);
       }
     }
     Holes();
   }
 }
 
-rotate([0,0,45]) Arch();
+rotate([0,0,45]) translate([0,0,arch_breadth]) rotate([0,180,0]) Arch();