From 41516027f2175860aeaebd734cfc74c288b395c6 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 10 Jun 2013 16:33:35 +0100
Subject: [PATCH] belt-slot-cut-jig: RegistrationProtrusions

---
 belt-slot-cut-jig.scad | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad
index f6e954c..4cb8331 100644
--- a/belt-slot-cut-jig.scad
+++ b/belt-slot-cut-jig.scad
@@ -31,6 +31,9 @@ jig_max_len = 160; // print diagonally
 registrationgroove_width = 0.8;
 registrationgroove_depth = 1.2;
 
+registrationprotrusion_poke = 3;
+registrationprotrusion_slope = 0.75;
+
 jig_overlap = 1;
 
 // from careful measurement
@@ -157,7 +160,38 @@ module OneJig(){
   }
 }
 
+module RegistrationProtrusion(){
+  // points towards the positive x axis
+  xsz = registrationprotrusion_poke;
+  ysz = registrationprotrusion_poke;
+  diag_sz = xsz * sqrt(2);
+  zsz = diag_sz / registrationprotrusion_slope;
+  hull(){
+    translate([0, 0, 0.1]){
+      linear_extrude(height=0.1)
+	polygon([[   0, -ysz ],
+		 [ xsz,    0 ],
+		 [   0,  ysz ]]);
+      translate([-0.1, 0, zsz ])
+	rotate([0,0,45])
+	cube(0.1);
+    }
+  }
+}
+
 module Jig(){
+  for(end=[0,1]){
+    for(yfrac=[-1/2, 0, 1/2]){
+      translate([ end
+		  ? jig_interval * (jig_iters - 0.5)
+		  : -jig_interval/2,
+		 yfrac * strap_width,
+		 0])
+	rotate([0,0, end ? 0 : 180])
+	translate([ jig_overlap, 0, 0 ])
+	RegistrationProtrusion();
+    }
+  }
   for (i=[0:jig_iters-1]) {
     translate([jig_interval * i, 0, 0])
       OneJig();
@@ -185,4 +219,5 @@ module Demo(){
 //Jig();
 //Demo();
 //JigT();
+//RegistrationProtrusion();
 //PunchHolderT();
-- 
2.30.2