X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=poster-tube-lid.scad;h=08127cde3bd7f137113fe1c0e384a143b9e21f1a;hb=3c1da07f2c510b741d2a83025220c7c1b70aab44;hp=d5d1f9318f3c2d7c1ad6c1c477f3148e4709f5ab;hpb=f1824fce4c0b4420e0ba377d8d8a4e43e42e4a7d;p=reprap-play.git

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index d5d1f93..08127cd 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -79,6 +79,7 @@ sm_closure_cnr = 3.0;
 
 catch_stalk_h = 4.5;
 catch_stalk_len = 50;
+catch_tip_th = 4;
 catch_head_th = 3;
 
 catch_pin_slop = 0.25; // each side, and above
@@ -86,11 +87,12 @@ catch_pin_slop_x_extra = 0.0; // only on one side
 catch_stalk_above_gap = 1.5;
 catch_stalk_eff_bend_rad = catch_stalk_len * 0.75;
 
+catch_strap_width = 12;
 catch_stalk_base_width = 15;
 
 catch_knob_dia = 6;
 catch_knob_above_gap = 5;
-catch_knob_height = 5;
+catch_knob_height = 3.0;
 
 catch_stalk_below_gap = 1.0;
 catch_stalk_beside_gap = 2.0;
@@ -149,7 +151,6 @@ 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_stalk_beside_gap;
-catch_strap_width = sm_main_width;
 catch_strap_thick = sm_main_thick;
 
 echo("R ", sm_inner_rad, bayo_real_rad, bayo_nom_rad);
@@ -199,8 +200,6 @@ echo(bayo_polygon);
 
 // CATCH
 
-//cppy6 = -catch_strap_width * 2/3;
-
 cppxC = 0.41 * sm_inner_rad * TAU;
 
 // catch pin
@@ -214,6 +213,7 @@ cppb = bayo_g + [1,-1] * catch_pin_slop + [1,0] * cpp_adj;
 cppd = [ bayo_n[0]
 	 - catch_pin_slop - catch_pin_slop_x_extra,
 	 -catch_stalk_above_gap ];
+cppi = [ cppa[0], cppd[1] ];
 cppc = [ cppd[0], cppb[1] ];
 cpph = cppd + [0,-1] * catch_stalk_h;
 cppe = cppd + [0,-1] * (catch_knob_above_gap + catch_knob_dia/2);
@@ -239,13 +239,15 @@ cppD = cppC + [0,-1] * catch_strap_width;
 
 // catch assembly stalk and so on
 
+catch_cr3 = catch_cr + catch_stalk_h;
+
 cppF = [ cppg[0] - catch_stalk_eff_bend_rad, cppd[1] ];
 cpp4 = [ cppg[0] - catch_stalk_len, cpph[1] ] + [1,-1] * catch_cr;
 cpp5 = [ cpp4[0], cppC[1] + catch_cr ];
 cpp2 = cpp5 + [-1,0] * (catch_cr * 2 + catch_stalk_base_width);
 cpp2r = cpp2 + [1,0] * catch_cr;
 cpp2d = cpp2 + [0,-1] * catch_cr;
-cpp3 = [ cpp2[0] + catch_cr * 2, cppd[1] - catch_cr ];
+cpp3 = [ cpp2[0] + catch_cr + catch_cr3, cppd[1] - catch_cr3 ];
 cppA = [ -cppxC, cpp9[1] ];
 cppE = [ cppA[0], cppD[1] ];
 
@@ -491,31 +493,32 @@ module ImplHeadCupTest(){ ////toplevel
       ImplHeadCup();
 }
 
-module SomeStrap(){
+module SomeStrap(width){
   // children(0) is to add, (1) subtract
   difference(){
     union(){
-      cylinder(r=sm_outer_rad, h=sm_main_width);
+      cylinder(r=sm_outer_rad, h=width);
       StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
 			   smc_max_y,
-			   sm_closure_cnr);
+			   sm_closure_cnr,
+			   width);
       children(0);
     }
     translate([0,0,-1])
-      cylinder(r=sm_inner_rad, h=sm_main_width+2);
+      cylinder(r=sm_inner_rad, h=width+2);
     translate(smc_pos)
-      StrapMountBolt(10);
+      StrapMountBolt(10, width);
     translate(smc_pos)
       cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
     children(1);
   }
 }
 
-module StrapMountBolt(l_delta){ ///toplevel
+module StrapMountBolt(l_delta, strap_width){ ///toplevel
   // positioned relative to smc_pos
   translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
 	     smc_bolt_y,
-	     sm_main_width/2]){
+	     strap_width/2]){
     translate([ -sm_bolt_shaft/2-1, 0,0 ]){
       rotate([0,90,0]) cylinder(r= sm_bolt_dia/2, h= sm_bolt_shaft+2);
     }
@@ -529,9 +532,9 @@ module StrapMountBolt(l_delta){ ///toplevel
   }
 }
 
-module StrapMountProtrusion(half_x, max_y, cnr){
+module StrapMountProtrusion(half_x, max_y, cnr, width){
   translate(smc_pos){
-    linear_extrude(height=sm_main_width, convexity=10){
+    linear_extrude(height=width, convexity=10){
       hull(){
 	for (m = [0,1]) mirror([m,0,0]) {
 	  translate([-(half_x - cnr), max_y - cnr])
@@ -545,7 +548,7 @@ module StrapMountProtrusion(half_x, max_y, cnr){
 }
 
 module StrapMount(){ ////toplevel
-  SomeStrap(){
+  SomeStrap(sm_main_width){
     rotate([0,0,180]){
       StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
 			   strap_hoop_thick,
@@ -563,7 +566,7 @@ module CatchAssemblyCoreProfile(){
   difference(){
     union(){
       hull(){
-	translate(cpp3) circle(r= catch_cr);
+	translate(cpp3) circle(r= catch_cr3);
 	polygon([ cpp3,
 		  cpp2r,
 		  cpp5,
@@ -597,9 +600,19 @@ module CatchAssemblyCoreProfile(){
     }
     translate(cpp2) circle(r= catch_cr);
   }
+  // if cpp11 is above cpp10, the subtracted hull above
+  // can go down too far.  Ensure we do not cut off below cppy6.
+  polygon([ cppE,
+	    cppD,
+	    cpp9,
+	    [ cpp9[0],            cppy6 ],
+	    [ cpp7[0] - catch_cr, cppy6 ],
+	    cpp2d
+	    ]);
 }
 
-module CatchHeadProfile(){
+module CatchTipProfile(dy){
+  ddy = [0,dy];
   intersection(){
     translate(cppF){
       difference(){
@@ -608,14 +621,17 @@ module CatchHeadProfile(){
       }
     }
     polygon([ cppa,
-	      cppg,
-	      cpph,
-	      cppd,
+	      cppi + ddy,
+	      cppd + ddy,
 	      cppc,
 	      cppb ]);
   }
+}
+
+module CatchHeadProfile(){
   polygon([ cppd,
-	    cppg,
+	    cppd,
+	    cppi,
 	    cppf,
 	    cppe,
 	    cpph ]);
@@ -626,6 +642,13 @@ module CatchCore(){ /////toplevel
   linear_extrude(height=catch_strap_thick, convexity=10)
     CatchAssemblyCoreProfile();
 
+  hull(){
+    linear_extrude(height=catch_head_th, convexity=10)
+      CatchTipProfile(0);
+    linear_extrude(height=catch_tip_th, convexity=10)
+      CatchTipProfile(catch_tip_th - catch_head_th);
+  }
+
   linear_extrude(height=catch_head_th, convexity=10)
     CatchHeadProfile();
 
@@ -651,7 +674,7 @@ module CatchAssembly(){ /////toplevel
 	       ".stl"),
 	   convexity=20);
 
-  SomeStrap(){
+  SomeStrap(catch_strap_width){
     union(){ }
     union(){
       translate([-200, -200, -200])