X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=pull-cord-keeper.scad;h=c8655c9842f942882addc05c8ce758eccbd62858;hp=b7a6aa7e6a9a929b6f9bba2c4b0a29bdcf93df6e;hb=b911b865a383d58a3ae5a3df866869e1963e099d;hpb=98e8b71a90856a50147edcce3c30a6836648f497

diff --git a/pull-cord-keeper.scad b/pull-cord-keeper.scad
index b7a6aa7..c8655c9 100644
--- a/pull-cord-keeper.scad
+++ b/pull-cord-keeper.scad
@@ -9,6 +9,25 @@ hcentredist = 10;
 blockdepth = 5;
 blockwidth = hcentredist*2 + 6;
 
+height = 20;
+
+roundedgedia = 7.5;
+
+ziglen = hcentredist/2;
+
+feedxgap = 5;
+feedzgap = 5;
+ribsgap = 1;
+
+ribdepth = 3;
+ribheight = 4;
+
+backxgap = 1;
+
+blockoverlapcnr = 5;
+
+screwholedia = 4 + 0.5;
+
 module Oval(centredist, rad) {
   hull() {
     translate([-centredist/2,0,0]) circle(r=rad);
@@ -16,19 +35,155 @@ module Oval(centredist, rad) {
   }
 }  
 
+module VExtrude(){
+  translate([0,0, -height/2])
+    linear_extrude(height=20)
+    children(0);
+}
+
+module OuterOval(){
+  Oval(hcentredist, houterrad);
+}
+
 module Hoop(){
   difference(){
-    Oval(hcentredist, houterrad);
+    hull(){
+      OuterOval();
+      translate([0, (blockdepth + hoopthick)/2 + hinnerrad])
+	square([blockwidth,
+		blockdepth + hoopthick],
+	       center=true);
+    }
     Oval(hcentredist, hinnerrad);
   }
 }
 
+module RoundEdges(){
+  intersection(){
+    VExtrude()
+      OuterOval();
+
+    for (xi=[-1,1]) {
+      hull(){
+	for (yi=[-1,1]) {
+	  translate([xi * (hcentredist/2 + hinnerrad),
+		     houterrad,
+		     yi * (height/2 - roundedgedia / 4 * sqrt(2))])
+	    rotate([90,0,0])
+	    cylinder(r=roundedgedia/2, h=houterrad*2, $fn=20);
+	}
+      }
+    }
+  }
+}
+
 module Positive(){
-  Hoop();
-  translate([0, (blockdepth + hoopthick)/2 + hinnerrad])
-    square([blockwidth,
-	    blockdepth + hoopthick],
-	   center=true);
+  difference(){
+    VExtrude()
+      Hoop();
+
+    rotate([90,0,0])
+      translate([0,0,-50])
+      cylinder(r=screwholedia/2, h=100);
+  }
+
+  RoundEdges();
+}
+
+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(cutmore) {
+  mirror([0,0,1]) {
+    translate([0, 0, -cutmore*feedzgap/2]) {
+      translate([-ziglen + -cutmore*feedxgap/2, -100, 0])
+	cube([100, 100, 50]);
+    }
+  }
+  translate([blockwidth/2 - blockoverlapcnr + -cutmore*backxgap/2,
+	     -1,
+	     -50])
+    cube([100, 100, 100]);
+
+  translate([ziglen + -cutmore*feedxgap/2,
+	     -50,
+	     -50])
+    cube([100, 51, 100]);
+
+  translate([50,
+	     hinnerrad/2 + houterrad/2 + blockdepth/2 + -cutmore*ribsgap/2,
+	     0])
+    rotate([-90,0,90])
+    linear_extrude(height=100)
+    Ribs();
+}
+
+module SDemo(){
+  //difference(){
+  %  Positive();
+  //  Division(0);
+  //}
+  Division(-1);
+}
+
+module A(){
+  difference(){
+    Positive();
+    Division(+1);
+  }
+}
+
+module B(){
+  intersection(){
+    Positive();
+    Division(-1);
+  }
 }
 
-Positive();
+module Demo(){
+  color("red") A();
+  color("blue") B();
+}
+
+module APrint(){ ////toplevel
+  rotate([0,180,0])
+    A();
+}
+
+module BPrint(){ ////toplevel
+  B();
+}
+
+module Kit(){ ////toplevel
+  translate([0, hinnerrad, 0])
+    APrint();
+  rotate([0,0,180])
+    BPrint();
+}
+
+//Ribs();
+//Demo();
+
+//A();
+//B();
+//%Division(+1);
+
+//Hoop();
+
+//Demo();
+//BPrint();
+
+//Kit();