X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=scaffold-clamp-common.scad;h=c16fbd8bce6dcb593b5101b543908aeb3d8af8f1;hb=3c1da07f2c510b741d2a83025220c7c1b70aab44;hp=d2640b6a9a08ef3e8b75c0467896634de7a9da05;hpb=8021ea1a561f769b7d4f66c47812397a726c722f;p=reprap-play.git

diff --git a/scaffold-clamp-common.scad b/scaffold-clamp-common.scad
index d2640b6..c16fbd8 100644
--- a/scaffold-clamp-common.scad
+++ b/scaffold-clamp-common.scad
@@ -28,6 +28,16 @@ bolt_gap = 1.0; // total, on both sides
 
 vhook_th = 14;
 
+// ---------- cleat ----------
+
+cleat_frames = 10;
+cleat_curve_r = 200;
+cleat_horn_l = 40;
+cleat_horn_d_min = [10, 12];
+cleat_horn_d_max = [12, 14];
+cleat_height = 25;
+cleat_stem_l = 20;
+
 // ---------- hhook ----------
 
 hhook_inside = 40;
@@ -43,6 +53,8 @@ pin_tail = pin_hole_dia + pin_head_th + hinge_z_gap*3;
 
 // ========== calculated ==========
 
+TAU = PI*2;
+
 hole_dia = th + pin_gap;
 
 bolt_hole_r = (bolt_dia + bolt_gap)/2;
@@ -79,6 +91,14 @@ vhook_y0 = -max(main_r, (tube_dia/2 + vhook_th));
 vhook_ctr = vhook_y0 - vhook_inside/2;
 vhook_outer_dia = vhook_inside + vhook_th*2;
 
+// calculated - cleat
+
+cleat_horn_tl = cleat_horn_l + cleat_stem_l/2;
+
+vcleat_dz = max(0,
+		cleat_horn_tl + cleat_horn_d_min[0]/2 - total_z/2
+		);
+
 // calculated - hhook
 
 hhook_outer_dia = hhook_inside + hhook_th*2;
@@ -236,6 +256,80 @@ module VHookPlanDemo(){
     }
 }
 
+// ---------- cleat ----------
+
+function cleat_frame_theta(s) = s * cleat_horn_tl / cleat_curve_r * 360/TAU;
+function cleat_frame_z(s) = cleat_curve_r * (1 - cos(cleat_frame_theta(s)));
+function cleat_frame_x(s) = cleat_curve_r * sin(cleat_frame_theta(s));
+function cleat_frame_r(s) = ( cleat_horn_d_min * s +
+			      cleat_horn_d_max * (1-s) ) * 0.5;
+
+module CleatFrameSphere(r) {
+  scale([1, r[1]/r[0], 1])
+    sphere(r= r[0]);
+}
+
+module CleatFrame(s) {
+  r = cleat_frame_r(s);
+  translate([cleat_frame_x(s), 0, cleat_frame_z(s)])
+    rotate([0, 90, 0])
+    CleatFrameSphere(r);
+}
+
+
+module CleatHorn(){
+  for (si=[0 : cleat_frames-2]) {
+    s0 = si / (cleat_frames-1);
+    s1 = (si+1) / (cleat_frames-1);
+    hull(){
+      CleatFrame(s0);
+      CleatFrame(s1);
+    }
+  }
+}
+
+module CleatBase(){
+  frames = cleat_frames/2;
+  se = cleat_stem_l/2 / cleat_horn_tl;
+  r = cleat_frame_r(se);
+
+  hull(){
+    for (s = [-se, se]) {
+      for (z= [-(cleat_height + tube_dia/2),
+	       cleat_frame_z(s)]) {
+	translate([cleat_frame_x(s), 0, z])
+	  linear_extrude(height=0.1)
+	  scale([1, r[1]/r[0]])
+	  circle(r=r[0]);
+      }
+    }
+  }
+}
+
+module VCleat(){
+  translate([0,0, vcleat_dz]){
+    difference(){
+      translate([0, -(main_r + cleat_height), 0]) {
+	rotate([0, -90, 90]) {
+	  CleatBase();
+	  for (m=[0,1]) {
+	    mirror([m,0,0]) {
+	      CleatHorn();
+	    }
+	  }
+	}
+      }
+      linextr(-cleat_stem_l, +cleat_stem_l)
+	circle(r = tube_dia/2 + 0.1);
+    }
+  }
+}
+
+module VCleatA(){ ////toplevel
+  DummyA();
+  VCleat();
+}
+
 // ---------- hhook ----------
 
 module HHookHookPlan(){
@@ -329,5 +423,12 @@ module Demo(){ ////toplevel
     rotate([0,0,180]) PinSitu();
 }
 
+module DemoPair(){ ////toplevel
+  color("red") rotate([180,0,0]) DemoA();
+  color("blue") DemoA();
+  color("orange") translate([hinge_x, 0, min_z - hinge_z_gap])
+    rotate([0,0,180]) PinSitu();
+}
+
 //PlanDemo();
 //HalfClamp();