witte1000 dirk.willems at tutanota.com
Thu May 23 06:39:19 EDT 2019

```Thank you all guy's for all your's kindly feedback and examples, this make
things very clear and do see now how to play with the different combinations
is just amazing, love it very much

For making things clear, I'm trying to re-design my protein skimmer inlet,
because I'm convince that my design will work much smoother, better mixing
of air and water and the most important less noise  ...

But for knowing I've to put it to the test ...

What I already accomplished is the following

\$fn=100;
eps=0.01;

// Skimmer_Inlet_Cone1
// cylinder 1
sic11h=30;
sic11r1=25;
sic11r2=16;

sic111h=sic11h;
sic111r1=sic11r1-2;
sic111r2=sic11r2-2;

// cylinder 2

sic12h=20;
sic12r=5;

sic122h=sic12h;
sic122r=sic12r-1;

// Skimmer_Inlet_Cone2

sic22h=30;
sic22r1=25;
sic22r2=12;

sic222h=sic22h;
sic222r1=sic22r1-1;
sic222r2=sic22r2-1;

// Skimmer_Large_Pipe
slph=105;
slphr1=16;
slphr2=14;

// Skimmer_Inlet_Cone1

difference() {
union() {
translate([0,37,15]) rotate([90,0,0]) cylinder(h=sic12h,r=sic12r);
cylinder(h=sic11h,r1=sic11r1,r2=sic11r2);
}
union() {
translate([0,37+eps,15]) rotate([90,0,0])
cylinder(h=sic122h+eps*2,r=sic122r);
translate([0,0,-eps])
cylinder(h=sic111h+2*eps,r1=sic111r1,r2=sic111r2);
}
}

//difference() {
//  union() {
//   translate([0,37,15]) rotate([90,0,0]) cylinder(h=20,r=5);
//   cylinder(h=30,r1=25,r2=16,central=true);
//}
//    translate([0,37,15]) rotate([90,0,0]) cylinder(h=20,r=4);
//    cylinder(h=30,r1=23,r2=14,central=true);
//}

// Skimmer_Inlet_Cone2

difference() {
cylinder(h=sic22h,r1=sic22r1,r2=sic22r2,central=true);
cylinder(h=sic222h,r1=sic222r1,r2=sic222r2,central=true);
}

// Skimmer_Large_Pipe

difference() {
translate([0,0,30]) cylinder(h=slph+2*eps,r=slphr1,central=true);
translate([0,0,30]) cylinder(h=slph+2*eps,r=slphr2,central=true);
}

which give me the result I've in my mind, don't know if it is all correct
with the overlays etc ....

The next thing I want is to smooth rounded the edge's of the front of the
cone and the large pipe, trying with hull and minkowski but I've to play
more with it ...

Also some more ambition is to have wings inside the cone for accelerator the
water ....

Great appreciate very much all your kind feedback ...

Thank you very much for teaching me all this amazing great stuff !!!

Kind Regards,
Dirk

--