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=94803d23bc4f14ab2b5542681a74053796872af4;hb=c0adfd670e03721fba3a19638a860309d5c37702;hpb=892cd79fc5a6853ac9efce9fc5d1cd75c1670599

diff --git a/brompton-computer-guard.scad b/brompton-computer-guard.scad
index 94803d2..35b0a18 100644
--- a/brompton-computer-guard.scad
+++ b/brompton-computer-guard.scad
@@ -11,7 +11,7 @@ arch_breadth = 25;
 hole_dia = 4 + 0.5;
 
 pbase_tab = 12;
-pbase_thick = 2;
+pbase_thick = 4;
 
 // computed
 
@@ -21,6 +21,11 @@ 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
@@ -64,27 +69,38 @@ module Holes(){
 }
 
 module MainCutout(){
-  translate([0,0,-1]) linear_extrude(height=100)
-    ArchCircle(arch_in_rad);
+  ArchCircle(arch_in_rad);
 }
 
 module Arch(){
   difference(){
     rotate([0,0,180]){
-      difference(){
-	linear_extrude(height=arch_breadth) ArchProfile(false);
-	MainCutout();
+      linear_extrude(height=arch_breadth) {
+	difference(){
+	  ArchProfile(false);
+	  MainCutout();
+	}
       }
       difference(){
-	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);
+	    }
+	  }
 	}
-	MainCutout();
       }
     }
     Holes();
   }
 }
 
-rotate([0,0,45]) Arch();
+rotate([0,0,45]) translate([0,0,arch_breadth]) rotate([0,180,0]) Arch();