Summary

a parametric arrowhead

difficult to print, Brim death and variable A = 0 if necessary!

sand has to be a clear edge and use in a foundry mold!

une pointe de fleche parametrique

difficile a imprimer, Brim aÂ mort et variable A=0 au besoin !

a poncer pour avoir un tranchant net et a utiliser dans un moule en fonderie !

Instructions

open in openscad
change value
compile & render
export as STL

use on fondry casting !

//parametric Standart
n=3; //number of wings - nombre d'ailette
L=50; //lenght top to bottom - longueur de la pointe a la base
l=20; //largeur d'une ailette
E=3 ; //thickness wings - epaisseur a la base de l'aillette
D=4; //interne tube diametre - diametre du tube interieur ferule

//Hole
hole="yes"; //"yes" or "no" hole
d=6.66; //Hole Diametre

// arrowbility!!
A=10; //arrawbility !! 0 for noob printer !, negative for the furious !

$fa=2;
$fs=0.01;

//1 aile
module aile(){

if(hole=="yes"){      difference(){          polyhedron(              points=[[0,0,0],[l,0,L],[0,-E/2,L-A],[0,E/2,L-A]],              faces=[[2,1,0],[3,2,0],[3,0,1],[1,2,3]]              );            translate([l/2.33,E,L/1.33]) rotate([90,0,0])cylinder(r=d/2,h=2*E);      }  }  else{      polyhedron(              points=[[0,0,0],[l,0,L],[0,-E/2,L-A],[0,E/2,L-A]],              faces=[[2,1,0],[3,2,0],[3,0,1],[1,2,3]]              );    }

}

//n aile
module fleche(){
for (i=[1:n]){
rotate([0,0,i*(360/n)])aile();
}
}
//tube centrale
module tube(){
translate([0,0,L/2])cylinder (r=D/2+0.75, h=L/2);
translate([0,0,L/5])cylinder(d1=0,r2=D/2+0.75,h=L/2-L/5);
}

// module principal
translate([0,0,L]) rotate([180,0,0])
difference(){
union(){
fleche();
tube();
}
translate([0,0,L/2+3]) cylinder (r=D/2, h=L);
}

parametric arrowheads - pointe de fleche parametrique