sewing-table: RoundCorner rework: introduce ctr3 (nfc)

[reprap-play.git] / lock-inframe-bracket.scad

diff --git a/lock-inframe-bracket.scad b/lock-inframe-bracket.scad
index 75c9a52e8f05f75f44ba327486bdcc46bb905a27..bf3c9130374c9d8305a8d55ef14158aa763e0f0d 100644 (file)
--- a/lock-inframe-bracket.scad
+++ b/lock-inframe-bracket.scad
@@ -1,5 +1,8 @@
 // -*- C -*-
 
+// use shell thickness 1.50
+// use fill density 40%
+
 include <funcs.scad>
 
 tube_dia = 27.5 + 1.625;
@@ -12,9 +15,9 @@ lockshaft_dia = 14.35;
 cliprecess_h = 16;
 total_h = 45;
 
-back_gap = 10;
-main_th = 2.5;
-tube_th = 2.25;
+back_gap = 12.5;
+main_th = 2.75;
+tube_th = 2.125;
 
 midweb_d = 3;
 clip_th = 3.5;
@@ -24,11 +27,13 @@ clip_d = 22.0;
 mountscrew_dia = 4 + 0.5;
 clipbolt_dia = 5 + 0.1;
 
-backflange_th = 3.5;
+backflange_th = 4.5;
 
 $fn=50;
 
-join_cr = 5;
+join_cr = 9;
+
+tube_rear_extra_th = 1;
 
 // calculated
 
@@ -56,7 +61,8 @@ module oval(sz){ // sz[0] > sz[1]
   }
 }
 
-module JoinCirc(jr){
+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 );
@@ -65,16 +71,24 @@ module JoinCirc(jr){
 
   echo(lock_0x, lock_0y, R,r, d, x,y);
 
-  rotate(atan2(lock_0y, lock_0x)) {
-    translate([x,-y])
-      circle(r= jr);
+  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]);
 
@@ -83,9 +97,7 @@ module MainPlan(){
       }
 
       hull(){
-       for (m=[0,1])
-         mirror([m,0])
-           JoinCirc(0.01);
+       JoinCircs(0.01);
        polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]);
       }
     }
@@ -98,9 +110,7 @@ module MainPlan(){
       oval([lock_w/2, lock_d/2]);
     }
 
-    for (m=[0,1])
-      mirror([m,0])
-       JoinCirc(join_cr);
+    JoinCircs(join_cr);
   }
 }
 
@@ -211,4 +221,4 @@ module TestClipBoltHole(){ //// toplevel
 //TestTopEdge();
 //TestClipBoltHole();
 
-//Bracket();
+Bracket();