From 87430bbb717b73eead94523d1db31681ad5d831b Mon Sep 17 00:00:00 2001
From: Jan Huwald <jh@sotun.de>
Date: Wed, 12 Feb 2014 14:05:28 +0100
Subject: back connector: add assembly hooks, add pcb holes

During assembly, use small hooks to hold the backplane board in the
correct position before it is attached with scews.

diff --git a/backplane.scad b/backplane.scad
index 9f00c95..d1f3f9f 100644
--- a/backplane.scad
+++ b/backplane.scad
@@ -17,10 +17,17 @@ module backplane_pcb() {
   difference() {
     cube([backplane_width, backplane_thickness, backplane_height]);
 
-    // screw holes for PCB screws
-    for (p = [[0, bar_thickness/2],
-              [0, tray_height - bar_thickness/2],
-	      [tray_width/2 - bar_thickness, tray_height - bar_thickness/2]])
+    // screw holes for ...
+    for (p = [// ... PCB screws
+              [0,                              bar_thickness/2],
+              [0,                              tray_height - bar_thickness/2],
+              [tray_width/2 - bar_thickness,   tray_height - bar_thickness/2],
+              [tray_width/2 + bar_thickness,   tray_height - bar_thickness/2],
+
+              // .. assembly hooks
+              [rail_width/2 + bar_thickness/2, bar_thickness/2],
+              [tray_width/4,                   tray_height - bar_thickness/2]
+             ])
       translate([p[0] - backplane_hoffset, 0, p[1] - backplane_voffset])
       rotate([-90, 0, 0])
       screw_hole();
diff --git a/connector_back.scad b/connector_back.scad
index 7672bce..532b5c8 100644
--- a/connector_back.scad
+++ b/connector_back.scad
@@ -1,6 +1,7 @@
 include <parameters.scad>
 
 use <connector.scad>
+use <hook.scad>
 use <nipple.scad>
 use <rail.scad>
 use <screw_hole.scad>
@@ -30,12 +31,21 @@ module back_connector(
                  back_connector_half(border_right, border_top, border_bottom);
     }
 
-  // screw holes for PCB screws
-  for (h = [bar_thickness/2, tray_height - bar_thickness/2])
-    translate([0, 0, h])
-    rotate([-90, 0, 0])
-    screw_hole(nut_depth = 1.1 * nut_height);
+    // screw holes for PCB screws
+    for (h = [bar_thickness/2, tray_height - bar_thickness/2])
+      translate([0, 0, h])
+      rotate([-90, 0, 0])
+      screw_hole(nut_depth = 1.1 * nut_height);
   }
+
+  // hooks to hold PCB during assembly
+  if (!border_right)
+    for (p = [[rail_width/2 + bar_thickness/2, bar_thickness/2],
+              [tray_width/4,                   tray_height - bar_thickness/2]])
+      translate([p[0], bar_thickness, p[1]])
+      hook(diameter = 0.7 * rod_diameter,
+           length_rest  = backplane_thickness,
+           length_slide = backplane_thickness);
 }
 
 back_connector();
diff --git a/hook.scad b/hook.scad
new file mode 100644
index 0000000..bdab179
--- /dev/null
+++ b/hook.scad
@@ -0,0 +1,16 @@
+module hook(diameter, length_rest, length_slide, angle=45) {
+  angle = 30;
+  rotate([-90, 0, 0])
+  cylinder(r=diameter/2, h=length_rest, $fs=0.1);
+
+  translate([0, length_rest, 0])
+  rotate([angle, 0, 0])
+  hull() {
+    translate([0, length_slide, 0])
+    sphere(diameter/2, $fs=0.1);
+
+    sphere(diameter/2, $fs=0.1);
+  }
+}
+
+hook(5, 20, 10);
-- 
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