X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=poster-tube-lid.scad;h=4ab3636d84a6bf0767cc9e04789594053d164ef8;hb=0738625c2c475ee9c363936c2a893360732b57ed;hp=73eec6200265cf055fd0a7011c44bf80b2ebe00f;hpb=592ab447dcaeb17bccefd78b29419b49ecca84bc;p=reprap-play.git

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 73eec62..4ab3636 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -1,6 +1,6 @@
 // -*- C -*-
 
-main_dia = 71.2 + 0.50;
+main_dia = 71.2 + 0.50 - 2.26;
 top_thick = 4;
 
 main_cnr = 4.0;
@@ -13,13 +13,16 @@ rivet_tall = 5.51 + 0.49;
 over_rivet_wall = 0.5;
 side_rivet_gap = 1.5;
 
-bayo_interf = 0.75;
+bayo_interf = 1.25;
 bayo_behind = 3.5;
 bayo_interf_width = 2.0;
 bayo_interf_slope = 0.75;
 
-seal_thick = 0.1;
-seal_recess = [ 2.0, 2.0 ]; // recess depth, recess height
+oring_thick = 5.0;
+oring_bore = 62.0;
+
+oring_upper_embed_angle = 80;
+oring_compress = 0.1; // proportion
 
 side_taper = 1.0;
 
@@ -32,7 +35,7 @@ bayo_slice_size = 1;
 brace_hole_width = 1.0;
 brace_above_below = 1.2;
 
-jig_thick = 1.0;
+jig_thick = 1.4;
 jig_hole_dia = 3.0;
 jig_rim = 5;
 jig_mark = 5;
@@ -44,6 +47,16 @@ bayo_entry_z = bayo_entry;
 bayo_inramp_x = bayo_entry;
 bayo_inramp_z = bayo_entry;
 
+oring_mid_dia = oring_bore + oring_thick;
+oring_outer_dia = oring_mid_dia + oring_thick;
+
+oring_oblate = (1 - oring_compress);
+
+oring_y_rad = oring_thick/2 * oring_oblate;
+oring_x_rad = oring_thick/2 / oring_oblate;
+
+seal_thick = oring_y_rad * (1 + cos(oring_upper_embed_angle));
+
 side_height = rivet_posn + bayo_behind + rivet_thick/2;
 side_thick = rivet_tall + over_rivet_wall;
 
@@ -70,7 +83,8 @@ bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
 bayo_k = bayo_l + [ bayo_interf_width, 0 ];
 bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
 bayo_i = bayo_j + [ rivet_width, 0 ];
-bayo_h = [ bayo_i[0], bayo_behind + rivet_thick + bayo_above_gap ];
+bayo_h = [ bayo_i[0], bayo_behind + rivet_thick
+	              + bayo_above_gap + bayo_interf ];
 bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];
 
 bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
@@ -100,27 +114,37 @@ echo(bayo_polygon);
 
 module MainProfile(){
   main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
-  translate(main_cnr_pos){
-    intersection(){
-      difference(){
-	circle(r = main_cnr);
-	circle(r = main_cnr * 0.5);
+  difference(){
+    union(){
+      translate(main_cnr_pos){
+	intersection(){
+	  difference(){
+	    circle(r = main_cnr);
+	    circle(r = main_cnr * 0.5);
+	  }
+	  square([10,10]);
+	}
       }
-      square([10,10]);
+      polygon([[ -11,                   seal_thick        ],
+	       [ -11,                   top_z             ],
+	       [ main_cnr_pos[0],       top_z             ],
+	       [ side_thick,            main_cnr_pos[1]   ],
+	       [ side_thick,            -side_height      ],
+	       [ side_taper,            -side_height      ],
+	       [ 0,                     -rivet_posn       ],
+	       [ 0,                     seal_thick        ],
+	       ],
+	      convexity=10);
+    }
+    translate([ oring_mid_dia/2 - main_dia/2, 0 ])
+      hull(){
+      translate([ 0, oring_y_rad ])
+	scale([ 1/oring_oblate, oring_oblate ])
+	circle(oring_thick/2);
+      translate([ 0, oring_y_rad*2 - oring_thick/2 ])
+	circle(oring_thick/2);
     }
   }
-  polygon([[ -1,                    seal_thick        ],
-	   [ -1,                    top_z             ],
-	   [ main_cnr_pos[0],       top_z             ],
-	   [ side_thick,            main_cnr_pos[1]   ],
-	   [ side_thick,            -side_height      ],
-	   [ side_taper,            -side_height      ],
-	   [ 0,                     -rivet_posn       ],
-	   [ 0,                     -(seal_recess[0] + seal_recess[1]) ],
-	   [ seal_recess[0],        -(seal_recess[0]) ],
-	   [ seal_recess[0],        seal_thick        ],
-	   ],
-	  convexity=10);
 }
 
 module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){
@@ -159,7 +183,7 @@ module BayonetCutout(){
     polygon(bayo_polygon, convexity=10);
 }
 
-module ProfilesDemo(){
+module ProfilesDemo(){ ////toplevel
   translate([-20,0]) MainProfile();
   polygon(bayo_polygon, convexity=10);
 }
@@ -171,7 +195,7 @@ module Cover(){ ////toplevel
 	translate([main_dia/2, 0])
 	MainProfile();
       translate([0,0, seal_thick])
-	cylinder(h= top_thick, r = main_dia/2);
+	cylinder(h= top_thick, r = main_dia/2 - 10);
     }
     for (r=[0,180])
       rotate([0,0, r])
@@ -211,13 +235,21 @@ module Jig(){ ////toplevel
   }
 }
 
-module CoverTest(){ ////toplevel
+module CoverTest2(){ ////toplevel
   difference(){
     Cover();
     SavingHole();
   }
 }
 
+module CoverTest1(){ ////toplevel
+  difference(){
+    CoverTest2();
+    translate([0,0, -10])
+      cube([ main_dia*3, main_dia * .85, 20], center=true);
+  }
+}
+
 //ProfilesDemo();
 //BayonetCutout();
 //MainProfile();