Can't figure this out - need some advice

I'm making an end cap that goes in the end of a carbon fiber tube with an outside diameter of 12mm and an inside diameter of 10mm.

To that end, I created the following:

difference ()
	{

		union ()
			{
				cylinder(13,3,3,$fn=100);  //main cylinder
				cylinder(3,6,6,$fn=100);   //disk on end
				translate([0,0,5])
				cylinder(1,5,5,$fn=100);   //fin 1
				translate([0,0,7])
				cylinder(1,5,5,$fn=100);	//fin 2
				translate([0,0,9])
				cylinder(1,5,5,$fn=100); //fin 3
				translate([0,0,11])
				cylinder(1,5,5,$fn=100);  //fin4
			}
		translate ([0,0,1])
		cylinder(25,1,1,$fn=100); //hollow center
	}

This works just fine, and looks......ok. What I really want to do is make the end cap (the 12mm X 3mm disk) into a slightly domed shape so it will look nicer. That's been the problem. Nothing I've tried works. Anyone have any advice?

Thanks,

Andy

---

"I have noticed that even those who assert that everything is predestined and that
we can change nothing about it still look both ways before they cross the street"

-Stephen Hawking

How about that?

difference ()
	{

		union ()
			{
		translate([0,0,3])
                cylinder(10,3,3,$fn=100);  //main cylinder
		intersection(){
                    translate ([0,0,6])
                    sphere(6, $fn=100);
                    cylinder(3,6,6,$fn=100);    //disk on end
                }
				translate([0,0,5])
				cylinder(1,5,5,$fn=100);   //fin 1
				translate([0,0,7])
				cylinder(1,5,5,$fn=100);	//fin 2
				translate([0,0,9])
				cylinder(1,5,5,$fn=100); //fin 3
				translate([0,0,11])
				cylinder(1,5,5,$fn=100);  //fin4
			}
		translate ([0,0,1])
		cylinder(25,1,1,$fn=100); //hollow center
	}

"
You can play around with the sphere size and it´s translation value until you find a nice looking shape. ( I like "12" for both )

Edited 2 time(s). Last edit at 06/30/2015 02:31AM by o_lampe.

Quote
o_lampe
How about that?

Perfect! You have no idea how much I messed around trying to achieve that! I should mention, while I have many technical talents, math and I don't get along very well, so sometimes, SCAD is a challenge for me.

Thanks again

---

"I have noticed that even those who assert that everything is predestined and that
we can change nothing about it still look both ways before they cross the street"

-Stephen Hawking

Sorry about replying to an old topic. I am still learning Openscad but I have been a hobby programmer for many years. I slightly modify o_lampe's code to use a for loop

difference ()
	{

		union ()
		{
		translate([0,0,3])
                cylinder(10,3,3,$fn=100);  //main cylinder
		intersection(){
                    translate ([0,0,6])
                    sphere(6, $fn=100);
                    cylinder(3,6,6,$fn=100);    //disk on end
                     }
                //For loop Z = 5 to 11 step 2 - Z movement
                for (z = [5:2:11]) {
                    translate([0,0,z])
                    cylinder(1,5,5,$fn=100);   //4 fins
                    }

	       }
		translate ([0,0,1])
		cylinder(25,1,1,$fn=100); //hollow center
}

Edited 1 time(s). Last edit at 08/16/2015 01:39AM by rrowan327.

Or

for (z = [5,7,9,11])

---

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