X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=pull-cord-keeper.scad;h=c3efb7fad419a7712b782c697cb4c51a7f6b7ff4;hb=2c283d200cf00a40bb9b0ab65f7d70173e86c86a;hp=115ca91d010402029e1a20a1a7d6f8c8282d4bbf;hpb=7fc9f05c6d28fd6b866de39a01bdb58a9dc827d0;p=reprap-play.git

diff --git a/pull-cord-keeper.scad b/pull-cord-keeper.scad
index 115ca91..c3efb7f 100644
--- a/pull-cord-keeper.scad
+++ b/pull-cord-keeper.scad
@@ -11,6 +11,17 @@ blockwidth = hcentredist*2 + 6;
 
 height = 20;
 
+ziglen = hcentredist/2;
+
+feedxgap = 5;
+feedzgap = 5;
+ribsgap = 1;
+
+ribdepth = 3;
+ribheight = 4;
+
+blockoverlapcnr = 5;
+
 module Oval(centredist, rad) {
   hull() {
     translate([-centredist/2,0,0]) circle(r=rad);
@@ -32,8 +43,78 @@ module Hoop(){
 }
 
 module Positive(){
-  linear_extrude(height=20)
+  translate([0,0, -height/2])
+    linear_extrude(height=20)
     Hoop();
 }
 
-Positive();
+module Ribs(){
+  imax = ceil(height*2 / ribheight);
+  for (i=[-imax:imax]) {
+    hull(){
+      translate([-ribdepth/2,
+		 ribheight*i,
+		 0])
+	polygon([[0,          0],
+		 [ribdepth, -ribheight],
+		 [ribdepth, +ribheight]]);
+      translate([50, 0])
+	square([1, height*2], center=true);
+    }
+  }
+}	    
+
+module Division(biggerpi) {
+  xgap = feedxgap * biggerpi;
+  zgap = feedzgap * biggerpi;
+
+  mirror([0,0,1]) {
+    translate([0, 0, zgap/2 * (1 - 2*biggerpi)]) {
+      translate([-ziglen + xgap/2, -100, 0])
+	cube([100, 100, 50]);
+    }
+  }
+  translate([blockwidth/2 - blockoverlapcnr, -0.1, 0])
+    cube([100, 100, 100]);
+
+  translate([50, houterrad + blockdepth/2 + ribsgap * biggerpi, 0])
+    rotate([-90,0,90])
+    linear_extrude(height=100)
+    Ribs();
+}
+
+module SDemo(){
+  //difference(){
+  %  Positive();
+  //  Division(0);
+  //}
+  Division(0);
+}
+
+module A(){
+  difference(){
+    Positive();
+    Division(0);
+  }
+}
+
+module B(){
+  intersection(){
+    Positive();
+    Division(1);
+  }
+}
+
+module Demo(){
+  color("red") A();
+//  color("blue") B();
+}
+
+//Ribs();
+//Demo();
+
+//A();
+B();
+%Division(0);
+
+//Demo();