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Patronendicke = 7.5;
Patronenlaenge = 40;
Wanddicke = 3;
Gewindelaenge = 10;
Gang = 2;
epsilon = 0.01;
auszen = 1;
difference() {
union() {
translate([0,0,-Wanddicke])
cylinder(h = Patronenlaenge/2 - Gewindelaenge/2 + Wanddicke, r = Patronendicke/2 + Wanddicke, $fn = 100);
translate([0,0,Patronenlaenge/2])
cylinder(h = Gewindelaenge, r = Patronendicke/2 + Wanddicke/3, $fn = 100, center = true);
translate([0,0,Patronenlaenge/2 - Gewindelaenge/2]) {
intersection() {
difference() {
linear_extrude(Gewindelaenge, twist = -Gewindelaenge / Gang * 360, slices = Gewindelaenge/Gang * 50, $fn = 100, convexity = 10)
translate([-Patronendicke,epsilon])
square(2*Patronendicke);
cylinder(h = Patronenlaenge, r = Patronendicke/2 + auszen*epsilon, $fn = 100);
}
cylinder(h = Gewindelaenge, r = Patronendicke/2 + Wanddicke*2/3 - (1-auszen) * epsilon, $fn=100);
}
difference() {
cylinder(h = Gewindelaenge, r = Patronendicke/2 + Wanddicke*auszen, $fn = 100);
cylinder(h = Gewindelaenge, r = Patronendicke/2 + Wanddicke*2/3 + epsilon, $fn = 100);
}
}
}
cylinder(h = Patronenlaenge + Wanddicke, r = Patronendicke/2, $fn = 100);
translate([0,0,(Patronenlaenge-Gewindelaenge)/2])
cylinder(h = Patronenlaenge + Wanddicke, r = Patronendicke/2 + auszen * (Wanddicke/3 + epsilon), $fn = 100);
}
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