X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=scaffold-clamp-common.scad;h=0f7ddf00b0b13732d6ebd835d83494a80b713b29;hb=6dba99d4594590c1af949fbd0379d366a05c2ca6;hp=dd714d490216cb0d26dc77164e2ea0979cdb0020;hpb=d5e5d1beef338e3c74cf5f4f436c009606aebd42;p=reprap-play.git

diff --git a/scaffold-clamp-common.scad b/scaffold-clamp-common.scad
index dd714d4..0f7ddf0 100644
--- a/scaffold-clamp-common.scad
+++ b/scaffold-clamp-common.scad
@@ -18,11 +18,20 @@ open_gap = 10;
 hinge_unit = 10;
 hinge_z_gap = 1;
 
+hinge_units = 4;
+
+// vhook
+
+vhook_th = 10;
+
+
 // calculated
 
 pin_dia = th;
 hole_dia = th + pin_gap;
 
+main_r = tube_dia/2 + th;
+
 hinge_gap = pin_gap;
 
 hinge_o_r = 0.5 * hole_dia + th;
@@ -41,6 +50,17 @@ max_z = +total_z/2;
 
 pin_flatten = pin_dia/2 * (1 - cos(45));
 
+// calculated - vhook
+
+vhook_inside = 15;
+
+vhook_theta = atan2( smooth_r, main_r );
+
+vhook_y0 = -cos(vhook_theta) * (main_r + smooth_r);
+vhook_ctr = vhook_y0 - vhook_inside/2;
+vhook_outer_dia = vhook_inside + vhook_th*2;
+
+
 $fa = 3;
 $fs = 0.1;
 
@@ -49,7 +69,7 @@ module SmoothPlan(){
 }
 
 module TubePlan(){ circle(r = tube_dia/2); }
-module MainCirclePlan(){ circle(r = tube_dia/2 + th); }
+module MainCirclePlan(){ circle(r = main_r); }
 
 module PlanWeldMainCircle(){
   intersection(){
@@ -131,7 +151,7 @@ module HalfClampX(flatten=false){
   }
 }
 
-module GeneralPlanDemo(){ ////toplevel
+module PlanDemo(){ ////toplevel
   MainPlan();
   translate([0,0,-4]) color("red") Portion(1);
   translate([0,0,-2]) color("grey") Portion(0);
@@ -140,9 +160,64 @@ module GeneralPlanDemo(){ ////toplevel
     MainPlanB();
     MainPlanA();
   }
+
+  translate([0, -tube_dia*1.5]) {
+    VHookPlanDemo();
+  }
 //  translate([max_x - hinge_x + 20, 0]) color("blue") MainPlanA();
 }
 
+// ---------- vhook ----------
+
+module VHookPlan() {
+  PlanWeldMainCircle(){
+    rectfromto([ -vhook_th/2, 0 ],
+	       [ +vhook_th/2, vhook_y0 ]);
+  }
+}
+
+module VHookProfile() {
+  translate([0, -vhook_inside/2 - vhook_th/2])
+    circle(r = vhook_th/2);
+}
+
+module VHookHookMain(){ ////toplevel
+  rotate([0,90,0])
+    rotate_extrude(convexity=10)
+    rotate([0,0,90])
+    VHookProfile();
+}
+
+module VHookPartA(){ ////toplevel
+  DummyA();
+  linextr(min_z, min(min_z + vhook_outer_dia * 1.5, max_z))
+    VHookPlan();
+
+  translate([0, vhook_ctr, min_z + vhook_outer_dia/2]){
+    linextr(-0.1, vhook_outer_dia/2)
+      VHookProfile();
+    intersection(){
+      VHookHookMain();
+      translate([0,0, -vhook_outer_dia])
+	cube(center=true, vhook_outer_dia*2);
+    }
+  }
+
+  //translate([0, vhook_y0, 50]) rotate([0,0,-90]) color("black") cube(10);
+  // translate([0,0,-150]) rotate([0,0,180 + theta]) color("blue") cube(100);
+}
+
+module VHookPlanDemo(){
+  VHookPlan();
+  translate([0, vhook_ctr, 5])
+    for (m=[0,1]) {
+      mirror([0,m])
+	color("blue") VHookProfile();
+    }
+}
+
+// ---------- misc ----------
+
 module GeneralB(){ ////toplevel
   HalfClampX(true);
 }