scaffold-clamp-cleat: wip, reorg nfc

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/scaffold-clamp-common.scad b/scaffold-clamp-common.scad
index 843e05c18d25ed398ec3d2e6c791f23b08b2a32a..f3e25ade20b7e2f9f3807fed3b352bfa439f0dad 100644 (file)
--- a/scaffold-clamp-common.scad
+++ b/scaffold-clamp-common.scad
@@ -249,12 +249,14 @@ module VHookPlanDemo(){
 
 // ---------- cleat ----------
 
+function cleat_frame_theta(s) = s * cleat_horn_l / 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));
+
 module CleatFrame(s) {
   r = ( cleat_horn_d_min * s +
        cleat_horn_d_max * (1-s) ) * 0.5;
-  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])
+  translate([cleat_frame_x(s), 0, cleat_frame_z(s)])
     rotate([0, 90, 0])
     scale([1, r[1]/r[0]])
     sphere(r= r[0]);