From 4c90200e603eee34c54c0c7d9745c09f05bc558b Mon Sep 17 00:00:00 2001
From: Timothy Schmidt <timschmidt@gmail.com>
Date: Wed, 5 Jan 2011 12:23:09 +0800
Subject: [PATCH] added gridbeam library

---
 gridbeam.scad | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 gridbeam.scad

diff --git a/gridbeam.scad b/gridbeam.scad
new file mode 100644
index 0000000..7701242
--- /dev/null
+++ b/gridbeam.scad
@@ -0,0 +1,71 @@
+/*
+ *  OpenSCAD GridBeam Library (www.openscad.org)
+ *  Copyright (C) 2009 Timothy Schmidt
+ *
+ *  License: LGPL 2.1 or later
+*/
+
+// zBeam(segments) - create a vertical gridbeam strut 'segments' long
+// xBeam(segments) - create a horizontal gridbeam strut along the X axis
+// yBeam(segments) - create a horizontal gridbeam strut along the Y axis
+// shelf(width, height) - create a shelf suitable for use in gridbeam structures width and height in 'segments'
+// translateBeam([x, y, z]) - translate gridbeam struts or shelves in X, Y, or Z axes in units 'segments'
+
+include <units.scad>
+
+$beam_width = inch * 1.5;
+$beam_hole_radius = inch * 5/16;
+$beam_is_hollow = 1;
+$beam_wall_thickness = inch * 1/8;
+$beam_shelf_thickness = inch * 1/4;
+
+module zBeam(segments) {
+	difference() {
+		cube([$beam_width, $beam_width, $beam_width * segments]);
+		for(i = [0 : segments - 1]) {
+			translate([$beam_width / 2, $beam_width + 1, $beam_width * i + $beam_width / 2])
+			rotate([90,0,0])
+			cylinder(r=$beam_hole_radius, h=$beam_width + 2);
+
+			translate([-1, $beam_width / 2, $beam_width * i + $beam_width / 2])
+			rotate([0,90,0])
+			cylinder(r=$beam_hole_radius, h=$beam_width + 2);
+		}
+	if ($beam_is_hollow == 1) {
+		translate([$beam_wall_thickness, $beam_wall_thickness, -1])
+		cube([$beam_width - $beam_wall_thickness * 2, $beam_width - $beam_wall_thickness * 2, $beam_width * segments + 2]);
+	}
+	}
+}
+
+module xBeam(segments) {
+	translateBeam([0,0,1])
+	rotate([0,90,0])
+	zBeam(segments);
+}
+
+module yBeam(segments) {
+	translateBeam([0,0,1])
+	rotate([-90,0,0])
+	zBeam(segments);
+}
+
+module translateBeam(v) {
+	for (i = [0 : $children - 1]) {
+		translate(v * $beam_width) child(i);
+	}
+}
+
+module shelf(width, depth) {
+	difference() {
+		cube([width * $beam_width, depth * $beam_width, $beam_shelf_thickness]);
+		translate([-1,  -1,  -1])
+		cube([$beam_width + 2, $beam_width + 2, $beam_shelf_thickness + 2]);
+		translate([-1, (depth - 1) * $beam_width, -1])
+		cube([$beam_width + 2, $beam_width + 2, $beam_shelf_thickness + 2]);
+		translate([(width - 1) * $beam_width, -1, -1])
+		cube([$beam_width + 2, $beam_width + 2, $beam_shelf_thickness + 2]);
+		translate([(width - 1) * $beam_width, (depth - 1) * $beam_width, -1])
+		cube([$beam_width + 2, $beam_width + 2, $beam_shelf_thickness + 2]);
+	}
+}
\ No newline at end of file