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=b70ea3d50cf7e4408020ec1d8e7655dab5ef5733;hp=1123a05e83ed0c5c4507b1e0023cd3f91eb1cf9d;hb=3c75c6575c9ec874afd93fe9d2e1c7f28390806f;hpb=6d012a0f0039c551e0210ad072ad3d1c7b7220df

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 1123a05..b70ea3d 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -75,6 +75,19 @@ sm_bolt_y_over = 0.5;
 
 sm_closure_cnr = 3.0;
 
+catch_stem_h = 3;
+catch_stem_len = 50;
+catch_stem_th = 3;
+
+catch_knob_dia = 6;
+catch_knob_above_gap = 8;
+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
 
 TAU = PI*2;
@@ -125,6 +138,44 @@ smc_max_y = smc_bolt_y + sm_bolt_y_over
 smc_cnr_c_x = sm_bolt_shaft/2 - sm_closure_cnr
   + sm_bolt_head_thick/2 + smc_bolt_nut_eff_thick/2;
 
+catch_cr = catch_knob_dia/2 + catch_stem_beside_gap;
+catch_strap_width = sm_main_width;
+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 = 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,
+	 -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;
+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] ];
+
 $fs= coarse ? 2.5 : 0.5;
 $fa= coarse ? 5 : 1;
 
@@ -407,6 +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,
@@ -441,31 +512,102 @@ module StrapMountProtrusion(half_x, max_y, cnr){
 }
 
 module StrapMount(){ ////toplevel
+  SomeStrap(){
+    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();
+    }
+    union(){ };
+  }
+}
+
+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,
+	      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
+  rotate([0,0, -0.5 * (cpp1[0] + cpp2[0]) / sm_inner_rad * 360/TAU])
+    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(){
-      cylinder(r=sm_outer_rad, h=sm_main_width);
-      StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
-			   smc_max_y,
-			   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([-200, -200, -200])
+	cube([400, 200, 400]);
     }
-    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);
   }
 }
 
+module CatchDemo(){ /////toplevel
+  color("blue") translate([0,0,
+	     -catch_strap_width
+	     -cpp0[1]
+	     ])
+    CatchAssembly();
+  translate([0,0,+side_height
+	     ])
+    Cover();
+}
+
 //ProfilesDemo();
 //BayonetCutout();
 //MainProfile();