X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=poster-tube-lid.scad;h=fb0667f9a8ec1283b8df0cfe6aa8928b632121c6;hp=cadbe62537c6a6b4f314240cfbf9f6a0a7c29130;hb=cd9506cd4f5fea2b670bf46cf45d937376e5e77f;hpb=d8f70205282e42f105ad4cb6df44d73a3404a166

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index cadbe62..fb0667f 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -81,12 +81,12 @@ catch_stem_th = 3;
 
 catch_knob_dia = 6;
 catch_knob_above_gap = 8;
-catch_stem_end_h = 12;
 catch_pin_height = 7;
 
 catch_stem_below_gap = 1.0;
 catch_stem_beside_gap = 2.0;
 catch_pin_gap = 0.5;
+catch_hook_slope = 0.15;
 
 // calculated
 
@@ -140,26 +140,39 @@ smc_cnr_c_x = sm_bolt_shaft/2 - sm_closure_cnr
 
 catch_cr = catch_knob_dia/2 + catch_stem_beside_gap;
 catch_strap_width = sm_main_width;
-
-cpp0 = [0,0];
+catch_strap_thick = sm_main_thick;
+catch_stem_end_h = catch_stem_h;
+catch_pin_width = rivet_entry_width - catch_pin_gap;
+
+cppy6 = -catch_strap_width/2;
+cppxC = 0.34 * sm_inner_rad * TAU;
+cppB = [ catch_pin_width/2,
+	 cppy6
+	 + catch_stem_below_gap
+	 + catch_pin_height
+	 + catch_knob_dia/2 ];
+cpp0 = [ 0,
+	 cppB[1]
+	 + catch_knob_dia
+	 + catch_knob_above_gap ];
+cpp12 = cpp0 + [1,0] * (catch_pin_height * catch_hook_slope);
 cpp1 = cpp0 + [0,1] * catch_pin_height;
-cpp2 = cpp0 + [1,0] * (rivet_entry_width - catch_pin_gap);
-cpp3 = cpp2 + [0,-1] * catch_stem_end_h;
-cpp4 = cpp2 + [0,-1] * catch_stem_end_h;
+cpp2 = cpp1 + [1,0] * catch_pin_width;
+cpp4 = cpp0 + [0,-1] * catch_stem_end_h;
+cpp3 = [ cpp2[0], cpp4[1] ];
 cpp5 = [ cpp0[0] - catch_stem_len,
-	 cpp0[1] - (catch_stem_h + catch_cr) ];
-cppB = [ 0.5*(cpp1 + cpp2)[0],
-	 cpp1[1] - catch_pin_height - catch_knob_above_gap -
-	 0.5 * catch_knob_dia ];
-cpp7 = cppB + [-1,-1] * catch_knob_dia/2
+	 -catch_stem_h ];
+cpp6 = [ cpp5[0], catch_cr ];
+cpp7 = cppB + [1,-1] * catch_knob_dia/2
             + [ catch_stem_beside_gap, -catch_stem_below_gap ]
             + [ 0, -catch_pin_height ]
             + [-1,1] * catch_cr;
-cpp6 = [ cpp5[0], cpp7[1] ];
-cpp8 = [ cpp7[0] + catch_cr*2,
-	 cpp0[0] - catch_cr ];
-cppC = cpp8 + [1,1] * catch_cr;
-cppA = [ cpp5[0] - catch_cr*2, cpp0[1] ];
+cpp11 = cpp7 + [1,0] * catch_cr;
+cpp10 = [ cpp11[0], 0 - catch_cr ];
+cpp8 = cpp10 + [1,0] * catch_cr;
+cpp9 = cpp8 + [0,1] * catch_cr;
+cppC = [ cppxC, cpp9[1] ];
+cppA = [ -cppxC, 0 ];
 cppD = cppC + [0,-1] * catch_strap_width;
 cppE = [ cppA[0], cppD[1] ];
 
@@ -445,6 +458,26 @@ module ImplHeadCupTest(){ ////toplevel
       ImplHeadCup();
 }
 
+module SomeStrap(){
+  // children(0) is to add, (1) subtract
+  difference(){
+    union(){
+      cylinder(r=sm_outer_rad, h=sm_main_width);
+      StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
+			   smc_max_y,
+			   sm_closure_cnr);
+      children(0);
+    }
+    translate([0,0,-1])
+      cylinder(r=sm_inner_rad, h=sm_main_width+2);
+    translate(smc_pos)
+      StrapMountBolt(10);
+    translate(smc_pos)
+      cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
+    children(1);
+  }
+}
+
 module StrapMountBolt(l_delta){ ///toplevel
   // positioned relative to smc_pos
   translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
@@ -479,43 +512,87 @@ module StrapMountProtrusion(half_x, max_y, cnr){
 }
 
 module StrapMount(){ ////toplevel
-  difference(){
-    union(){
-      cylinder(r=sm_outer_rad, h=sm_main_width);
-      StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
-			   smc_max_y,
+  SomeStrap(){
+    rotate([0,0,180]){
+      StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
+			   strap_hoop_thick,
 			   sm_closure_cnr);
-      rotate([0,0,180]){
-	StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
-			     strap_hoop_thick,
-			     sm_closure_cnr);
-	translate(smc_pos +
-		  [0,0, sm_main_width] +
-		  strap_hoop_thick * [ 0, 0.5, -1.0 ])
-	  StrapHoop();
-      }
+      translate(smc_pos +
+		[0,0, sm_main_width] +
+		strap_hoop_thick * [ 0, 0.5, -1.0 ])
+	StrapHoop();
     }
-    translate([0,0,-1])
-      cylinder(r=sm_inner_rad, h=sm_main_width+2);
-    translate(smc_pos)
-      StrapMountBolt(10);
-    translate(smc_pos)
-      cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
+    union(){ };
   }
 }
 
-module CatchCoreProfile(){
+module CatchCoreProfile(){ ////toplevel
+  hull(){
+    translate(cppB) circle(r= catch_knob_dia/2);
+    polygon([cpp4,
+	     cppB,
+	     cpp3]);
+  }
+  translate(cpp8)
+    circle(catch_cr);
+  polygon([
+	   cpp4,
+	   cppB,
+	   cpp3,
+	   cpp2,
+	   cpp1,
+	   cpp12,
+	   ]);
   difference(){
     polygon([ cpp4,
 	      cpp3,
-	      cpp2,
-	      cpp1,
-	      cpp0,
+	      cpp12,
 	      cppA,
 	      cppE,
 	      cppD,
 	      cppC,
-	      ]);
+	      cpp9,
+	      cpp10,
+	      cpp11,
+	      cpp7,
+	      cpp5,
+	      ], convexity=10);
+    hull(){
+      translate(cpp7) circle(r= catch_cr);
+      polygon([ cpp7,
+		cpp5,
+		cpp11 ]);
+    }
+    hull(){
+      translate(cpp6) circle(catch_cr);
+      polygon([ cppA,
+		cpp0,
+		cpp1 ]);
+    }
+  }
+}
+
+module CatchPreDistort(){ /////toplevel
+  scale(100 / sm_inner_rad)
+    rotate([90,0,0])
+    linear_extrude(height=catch_strap_thick, convexity=10)
+    CatchCoreProfile();
+}
+
+module CatchAssembly(){ /////toplevel
+  translate([0,0, catch_strap_width])
+    scale(sm_inner_rad / 100)
+    import(str("poster-tube-lid,CatchPostDistort-fa",
+	       (coarse ? 20 : 1),
+	       ".stl"),
+	   convexity=20);
+
+  SomeStrap(){
+    union(){ }
+    union(){
+      translate([-200, -200, -200])
+	cube([400, 200, 400]);
+    }
   }
 }