Clifford Wolf:

	Added examples/example020.scad (screw and nut)



git-svn-id: http://svn.clifford.at/openscad/trunk@325 b57f626f-c46c-0410-a088-ec61d464b74c

1 files changed, 39 insertions, 0 deletions

diff --git a/examples/example020.scad b/examples/example020.scad
new file mode 100644
index 0000000..8322939
--- /dev/null
+++ b/examples/example020.scad
@@ -0,0 +1,39 @@
+
+module screw(type = 2, r1 = 15, r2 = 20, n = 7, h = 100, t = 8)
+{
+	linear_extrude(height = h, twist = 360*t/n, convexity = t)
+	difference() {
+		circle(r2);
+		for (i = [0:n-1]) {
+				if (type == 1) rotate(i*360/n) polygon([
+						[ 2*r2, 0 ],
+						[ r2, 0 ],
+						[ r1*cos(180/n), r1*sin(180/n) ],
+						[ r2*cos(360/n), r2*sin(360/n) ],
+						[ 2*r2*cos(360/n), 2*r2*sin(360/n) ],
+				]);
+				if (type == 2) rotate(i*360/n) polygon([
+						[ 2*r2, 0 ],
+						[ r2, 0 ],
+						[ r1*cos(90/n), r1*sin(90/n) ],
+						[ r1*cos(180/n), r1*sin(180/n) ],
+						[ r2*cos(270/n), r2*sin(270/n) ],
+						[ 2*r2*cos(270/n), 2*r2*sin(270/n) ],
+				]);
+		}
+	}
+}
+
+module nut(type = 2, r1 = 16, r2 = 21, r3 = 30, s = 6, n = 7, h = 100/5, t = 8/5)
+{
+	difference() {
+		cylinder($fn = s, r = r3, h = h);
+		translate([ 0, 0, -h/2 ]) screw(type, r1, r2, n, h*2, t*2);
+	}
+}
+
+translate([ -30, 0, 0 ])
+screw();
+
+translate([ 30, 0, 0 ])
+nut();