X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=lock-inframe-bracket.scad;h=bf3c9130374c9d8305a8d55ef14158aa763e0f0d;hp=e531cb73dbd4f3c284bad091be758ca5eeb1bddb;hb=55000fa41db8d2fb6c8aba14cc5e47148c8fc189;hpb=67f71df744431b445649cc905e92829633ee8dc4

diff --git a/lock-inframe-bracket.scad b/lock-inframe-bracket.scad
index e531cb7..bf3c913 100644
--- a/lock-inframe-bracket.scad
+++ b/lock-inframe-bracket.scad
@@ -1,39 +1,52 @@
 // -*- C -*-
 
-tube_dia = 27.5 + 0.5;
+// use shell thickness 1.50
+// use fill density 40%
+
+include <funcs.scad>
+
+tube_dia = 27.5 + 1.625;
 lock_w = 42.5 + 0.5;
 lock_d = 28.0 + 0.5;
 main_h = 45.0;
 backflange_d = 12;
+lockshaft_dia = 14.35;
 
-lockshaft_r = [5, 5];
 cliprecess_h = 16;
 total_h = 45;
 
-back_gap = 7;
-main_th = 2.5;
+back_gap = 12.5;
+main_th = 2.75;
+tube_th = 2.125;
+
 midweb_d = 3;
-clip_th = 2.5;
+clip_th = 3.5;
 clip_gap = 2.5;
 clip_d = 22.0;
 
 mountscrew_dia = 4 + 0.5;
-clipbolt_dia = 5 + 0.5;
+clipbolt_dia = 5 + 0.1;
 
-backflange_th = 3.5;
+backflange_th = 4.5;
 
 $fn=50;
 
+join_cr = 9;
+
+tube_rear_extra_th = 1;
+
 // calculated
 
+lockshaft_r = [1, 1] * lockshaft_dia / 2;
 front_th = main_th;
-tube_th = main_th;
 
 tube_or = tube_dia/2 + tube_th;
 back_ohw = back_gap/2 + backflange_th;
 backflange_ymin = tube_or+backflange_d;
 
 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
+lock_0x = lock_w/2 - lock_d/2;
+lock_0 = [lock_0x,lock_0y];
 
 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
 
@@ -48,24 +61,56 @@ module oval(sz){ // sz[0] > sz[1]
   }
 }
 
+module JoinCircs(jr){
+  // http://mathworld.wolfram.com/Circle-CircleIntersection.html
+  R = tube_or + join_cr;
+  r = lock_or[1] + join_cr;
+  d = dist2d( [0,0], lock_0 );
+  x = (d*d - r*r + R*R) / (2*d);
+  y = sqrt( R*R - x*x );
+
+  echo(lock_0x, lock_0y, R,r, d, x,y);
+
+  for (m=[0,1]) {
+    mirror([m,0]) {
+      rotate(atan2(lock_0y, lock_0x)) {
+	translate([x,-y])
+	  circle(r= jr);
+      }
+    }
+  }
+}
+
 module MainPlan(){
   difference(){
     union(){
-      circle(r = tube_or);
+      hull(){
+	for (t=[0, tube_rear_extra_th])
+	  translate([0, -t])
+	    circle(r = tube_or);
+      }
       translate([-back_ohw,0]) mirror([0,1])
 	square([back_ohw*2, backflange_ymin]);
+
+      translate([0, lock_0y]){
+	oval(lock_or);
+      }
+
+      hull(){
+	JoinCircs(0.01);
+	polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
+      }
     }
+
     circle(r = tube_dia/2);
     translate([-back_gap/2,1]) mirror([0,1])
       square([back_gap, backflange_ymin+2]);
-  }
-  translate([0, lock_0y]){
-    difference(){
-      union(){
-	oval(lock_or);
-      }
+
+    translate([0, lock_0y]){
       oval([lock_w/2, lock_d/2]);
     }
+
+    JoinCircs(join_cr);
   }
 }
 
@@ -75,7 +120,11 @@ clip_ymin = cliprecess_ymax - total_h;
 clip_ogap = clip_gap + clip_th*2;
 
 module ClipElevationPositive(){
-  oval(lockshaft_or);
+  hull(){
+    oval(lockshaft_or);
+    translate([0, -lockshaft_or[1] * sqrt(2)])
+      square(center=true, 0.5);
+  }
   translate([-lockshaft_or[0], 0])
     square([lockshaft_or[0]*2, cliprecess_ymax]);
   translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
@@ -120,7 +169,7 @@ module ThroughHoles(){
   }
 
   ThroughHole( clipbolt_dia/2,
-	       lock_0y + lock_d/2 + clip_d/2,
+	       lock_0y + lock_d/2 + clip_d/2 + front_th/2,
 	       total_h - cliprecess_h - clip_th - clip_d/2 );
 }
 
@@ -134,16 +183,42 @@ module MainPositive(){
   }
 }
 
-module Bracket(){
+module Bracket(){ //// toplevel
   difference(){
     MainPositive();
     ThroughHoles();
   }
 }
 
+module TestTopEdge(){ //// toplevel
+  intersection(){
+    translate([0,0, -total_h])
+      translate([0,0, 4])
+      Bracket();
+    translate([-200,-200,0])
+      cube([400,400,100]);
+  }
+}
+
+module TestClipBoltHole(){ //// toplevel
+  intersection(){
+    union(){
+      translate([0, 0, -5])
+	Bracket();
+      translate([-4, lock_0y + lock_d/2 + 1, 0])
+	cube([8, 4, 1.5]);
+    }
+    translate([-200, lock_0y + lock_d/2 + 0.1])
+      cube([400, 400, total_h-20]);
+  }
+}
+
 //MainPlan();
+//ClipElevationPositive();
 //ClipElevation();
 //MainPositive();
 //%ThroughHoles();
+//TestTopEdge();
+//TestClipBoltHole();
 
 Bracket();