X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=trailerhubcap.scad;h=4ae4c7d48e7c8a9123d1fd9927410ad1d406f74f;hp=e3bcd4d6abbfc3dfaa6550a39b8f58842677a385;hb=ede4cdb4cb035387f745308a99a155ce50c8196f;hpb=95a6345a3442d4a3bf9a7f79eed333670b8650c6

diff --git a/trailerhubcap.scad b/trailerhubcap.scad
index e3bcd4d..4ae4c7d 100644
--- a/trailerhubcap.scad
+++ b/trailerhubcap.scad
@@ -1,15 +1,80 @@
-mainrad = 28.4;
+// Copyright (C)2012 Ian Jackson
+// Licenced under the GNU General Public Licence, version 3, or
+// (at your option) any later version.  There is NO WARRANTY.
+
+maindia = 29.7;
 poleholeh = 5.0;
 polecovth = 0.4;
 poleholerad = 6;
-  
+
+mainoverlap = 1.5;
+
+hookbasew = 5.0;
+hookfullw = 7;
+hookheight = 4.5;
+hookwidth = 8;
+hookbevelw = 0.75;
+hookbevelh = 1.5;
+
+fingernaildepth = 5;
+fingernailheight = 2.5;
+fingernailwidth = 6;
+
+bigrad = maindia/2 + mainoverlap;
 mainth = poleholeh + polecovth;
+hooklessdepth = hookfullw - hookbasew;
+
+module base() {
+  rotate_extrude(convexity=10)
+    mirror([1,0,0])
+    polygon(points=[[-bigrad, 0],
+		    [-bigrad + mainth, -mainth],
+		    [0, -mainth],
+		    [0, -poleholeh],
+		    [-poleholerad, -poleholeh],
+		    [-poleholerad, 0]]);
+}
+
+module fingernails() {
+  for (ang=[60,180,300])
+    rotate([0,0,ang])
+      translate([bigrad - fingernaildepth,
+		 -fingernailwidth/2,
+		 -fingernailheight])
+      cube([fingernaildepth + 1, fingernailwidth, fingernailheight + 1]);
+}
+
+module hookrim() {
+  rotate_extrude(convexity=10)
+    mirror([1,0,0])
+    translate([-maindia/2, 0, 0])
+    polygon(points=[[hooklessdepth, 0],
+		    [hookfullw, 0],
+		    [hookfullw*0.33, hookheight],
+		    [hookbevelw, hookheight],
+		    [0, hookheight-hookbevelh],
+		    [0, hooklessdepth]]);
+}
+
+module hooktriangles() {
+  for (ang=[0,120,240]) {
+    rotate([0,0,ang]) {
+      translate([0,0,-1]) {
+	linear_extrude(height=hookheight+2) {
+	  polygon(points=[[0, 0],
+			  [maindia/2 + 1, -hookwidth],
+			  [maindia/2 + 1, +hookwidth]]);
+	}
+      }
+    }
+  }
+}
 
-rotate_extrude(convexity=10)
-  mirror([1,0,0])
-  polygon(points=[[-mainrad/2, 0],
-		  [-mainrad/2 + mainth, -mainth],
-		  [0, -mainth],
-		  [0, -poleholeh],
-		  [-poleholerad, -poleholeh],
-		  [-poleholerad, 0]]);
+difference(){
+  base();
+  fingernails();
+}
+intersection(){
+  hookrim();
+  hooktriangles();
+}