From bd267a1c154423c410e00ab145c62dbbb2de85d9 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 22 Jan 2021 18:01:51 +0000
Subject: [PATCH] scaffold-clamp-cleat: wip

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 scaffold-clamp-cleat.scad  | 11 +++++++++++
 scaffold-clamp-common.scad | 39 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 scaffold-clamp-cleat.scad

diff --git a/scaffold-clamp-cleat.scad b/scaffold-clamp-cleat.scad
new file mode 100644
index 0000000..ec697a3
--- /dev/null
+++ b/scaffold-clamp-cleat.scad
@@ -0,0 +1,11 @@
+// -*- C -*-
+
+// Per cleat print
+//     VCleatA
+//     GeneralB
+//     Pin
+
+//// toplevels-from:
+include <scaffold-clamp-common.scad>
+
+module DemoA(){ VHookA(); }
diff --git a/scaffold-clamp-common.scad b/scaffold-clamp-common.scad
index d2640b6..5dabac5 100644
--- a/scaffold-clamp-common.scad
+++ b/scaffold-clamp-common.scad
@@ -28,6 +28,14 @@ bolt_gap = 1.0; // total, on both sides
 
 vhook_th = 14;
 
+// ---------- cleat ----------
+
+cleat_frames = 10;
+cleat_curve_r = 200;
+cleat_horn_l = 60;
+cleat_horn_d_min = 8;
+cleat_horn_d_max = 10;
+
 // ---------- hhook ----------
 
 hhook_inside = 40;
@@ -43,6 +51,8 @@ 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;
@@ -236,6 +246,35 @@ module VHookPlanDemo(){
     }
 }
 
+// ---------- cleat ----------
+
+module CleatFrame(s) {
+  translate([0,0, cleat_curve_r])
+    rotate( s * cleat_horn_l / cleat_curve_r * 360/TAU * [0,1,0] )
+    translate([0,0, -cleat_curve_r])
+    rotate([0, 90, 0])
+    sphere(r= ( cleat_horn_d_min * s +
+		cleat_horn_d_max * (1-s) ) * 0.5);
+}
+
+
+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 VCleatA(){ ////toplevel
+//  DummyA();
+
+  CleatHorn();
+}
+
 // ---------- hhook ----------
 
 module HHookHookPlan(){
-- 
2.30.2