//3 cup anaometer and windmill gen
//three way cross piece (better hole res).
//J P Hare version 1.2 Sept. 1st 2014
//includes hex nut fitting

//ca. 50 min print time on Ormerod

hex_nut = 3.4;

difference () {
//draw first arm
translate([0,-5,-5])
cube([60,10,10]);

//3mm central hole
cylinder(h = 12, r=1.5, $fn=30, center = true);

//'drill' a 3mm hole at arm end
translate([55,0,0])
rotate ([90,0,0])
cylinder(h = 12, r=1.5,  $fn=30, center = true);

//hex nut hole on top
translate([0,0,4])
cylinder(h = 3, r=hex_nut, $fn=6, center = true);
}

difference () {
//draw second arm
rotate ([0,0,120])
translate([0,-5,-5])
cube([60,10,10]);

//repeat 3mm central hole
cylinder(h = 12, r=1.5, $fn=30, center = true);

//'drill' a 3mm hole at arm end
rotate ([90,0,120])
translate([55,0,0])
cylinder(h = 12, r=1.5,  $fn=30, center = true);

//hex nut hole on top
translate([0,0,4])
cylinder(h = 3, r=hex_nut, $fn=6, center = true);
}

difference () {
//draw third arm
rotate ([0,0,-120])
translate([0,-5,-5])
cube([60,10,10]);

//repeat 3mm central hole
cylinder(h = 12, r=1.5, $fn=30, center = true);

//'drill' a 3mm hole at arm end
rotate ([90,0,-120])
translate([55,0,0])
cylinder(h = 12, r=1.5,  $fn=30, center = true);

//hex nut hole on top
translate([0,0,4])
cylinder(h = 3, r=hex_nut, $fn=6, center = true);

}