Updates

tir_sportif/dioptre-pédagogique/scad/ballJoint.scad

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+// Ball joint in SCAD by Erik de Bruijn
+// Based on a design by Makerblock ( http://makerblock.com/2010/03/blender-help/ )
+size=10; // size of the ball joint
+joint_spacing =0.5; // some space between them?
+joint_thickness = 2; // thickness of the arms
+joint_arms = 5; // how many arms do you want?
+arm_width = 10; // actually: how much is removed from the arms Larger values will remove more
+
+//render settings
+$fs=0.8; // def 1, 0.2 is high res
+$fa=4;//def 12, 3 is very nice
+
+//print();
+demo(); // turn on animation, FPS 15, steps 200
+
+module demo()
+{
+ball();
+rotate([sin($t*720)*28,cos($t*360*4)*28,cos($t*360*2)*20]) joint();
+
+}
+module print()
+{
+  translate([size*2+10,0,0]) ball();
+  rotate([0,180,0]) joint();
+}
+
+module ball()
+{
+	sphere(r=size);
+	translate([0,0,-size]) cylinder(r1=8,r2=6,h=3);
+	translate([0,0,-size-3]) cylinder(r=8,h=3);
+}
+
+
+
+module joint()
+{
+difference()
+{
+	sphere(r=size+joint_spacing+joint_thickness);
+	sphere(r=size+joint_spacing);
+	translate([0,0,-size-3]) cube([size+joint_spacing+joint_thickness+25,size+joint_spacing+joint_thickness+25,18],center=true);
+	for(i=[0:joint_arms])
+	{
+		rotate([0,0,360/joint_arms*i]) translate([-arm_width/2,0, -size/2-4])
+			cube([arm_width,size+joint_spacing+joint_thickness+20,size+6]);
+	}
+}
+	translate([0,0,size-2]) cylinder(r2=8,r1=8,h=5);
+
+}