X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=poster-tube-lid.scad;h=526f7ea6a89ad136db79cc052b17d2cb00aa317a;hb=87da6b24773fbbb33640a6ddfe2432b0d1aea8a3;hp=4ab3636d84a6bf0767cc9e04789594053d164ef8;hpb=0738625c2c475ee9c363936c2a893360732b57ed;p=reprap-play.git

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 4ab3636..526f7ea 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -1,16 +1,20 @@
 // -*- C -*-
 
+coarse = false;
+
 main_dia = 71.2 + 0.50 - 2.26;
-top_thick = 4;
+top_thick_middle = 4;
+top_thick_by_oring = 3.0;
+top_middle_dr = 11;
 
-main_cnr = 4.0;
+main_cnr = 6.0;
 
 rivet_posn = 6.0;
 rivet_thick = 1.67;
 rivet_width = 4.15 + 1.0;
 rivet_tall = 5.51 + 0.49;
 
-over_rivet_wall = 0.5;
+over_rivet_wall = 1.0;
 side_rivet_gap = 1.5;
 
 bayo_interf = 1.25;
@@ -30,10 +34,11 @@ bayo_above_gap = 1.0;
 
 bayo_entry = bayo_behind/3;
 
-bayo_slice_size = 1;
+bayo_slice_size = coarse ? 5 : 1;
 
 brace_hole_width = 1.0;
 brace_above_below = 1.2;
+brace_end_shorter = 0.3;
 
 jig_thick = 1.4;
 jig_hole_dia = 3.0;
@@ -55,12 +60,14 @@ 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));
+by_oring_z = 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;
 
-top_z = top_thick + seal_thick;
+top_z = top_thick_by_oring + oring_y_rad + by_oring_z;
+
+middle_bot_z = top_z - top_thick_middle;
 
 bayo_entry = bayo_behind / 3.0;
 bayo_top_z = bayo_behind + rivet_thick + bayo_above_gap;
@@ -70,8 +77,8 @@ rivet_entry_width = rivet_width + side_rivet_gap;
 
 jig_mark_rad = jig_mark + main_dia/2 + jig_thick;
 
-$fs=0.5;
-$fa=1;
+$fs= coarse ? 2.5 : 0.5;
+$fa= coarse ? 5 : 1;
 
 // bayonet definition
 
@@ -125,14 +132,15 @@ module MainProfile(){
 	  square([10,10]);
 	}
       }
-      polygon([[ -11,                   seal_thick        ],
-	       [ -11,                   top_z             ],
+      polygon([[ -top_middle_dr,        middle_bot_z      ],
+	       [ -top_middle_dr,        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        ],
+	       [ 0,                     by_oring_z        ],
+	       [ -oring_x_rad,          by_oring_z        ],
 	       ],
 	      convexity=10);
     }
@@ -184,8 +192,8 @@ module BayonetCutout(){
 }
 
 module ProfilesDemo(){ ////toplevel
-  translate([-20,0]) MainProfile();
-  polygon(bayo_polygon, convexity=10);
+  translate([-10,0]) MainProfile();
+  translate([+10,0]) polygon(bayo_polygon, convexity=10);
 }
 
 module Cover(){ ////toplevel
@@ -194,8 +202,8 @@ module Cover(){ ////toplevel
       rotate_extrude(convexity=10)
 	translate([main_dia/2, 0])
 	MainProfile();
-      translate([0,0, seal_thick])
-	cylinder(h= top_thick, r = main_dia/2 - 10);
+      translate([0,0, middle_bot_z])
+	cylinder(h= top_thick_middle, r = main_dia/2 - top_middle_dr + 1);
     }
     for (r=[0,180])
       rotate([0,0, r])
@@ -203,9 +211,10 @@ module Cover(){ ////toplevel
 	BayonetCutout();
     for (r=[0 : 60 : 179]) {
       rotate([0,0, r]) {
-	height = top_thick - brace_above_below*2;
-	translate([0,0, seal_thick + brace_above_below + height/2 ])
-	cube(center=true, [ main_dia, brace_hole_width, height ]);
+	height = top_thick_middle - brace_above_below*2;
+	translate([0,0, middle_bot_z + brace_above_below + height/2 ])
+	cube(center=true, [ oring_bore - brace_end_shorter,
+			    brace_hole_width, height ]);
       }
     }
   }
@@ -245,8 +254,13 @@ module CoverTest2(){ ////toplevel
 module CoverTest1(){ ////toplevel
   difference(){
     CoverTest2();
-    translate([0,0, -10])
-      cube([ main_dia*3, main_dia * .85, 20], center=true);
+    for (r= [ 40, 147 ]){
+      rotate([0,0, r]){
+	translate([0,0, -10]) {
+	  cube([ main_dia*3, main_dia * .55, 18], center=true);
+	}
+      }
+    }
   }
 }