Impossible shape ?

Currently, I am designing an OpenScad copy of my MarkV Diving helmet.
You can see the results up till now here : MarkV Helmet

As you can see, most of the shapes come out very well, not the least by using the hull function :-), but I have no idea how to start shaping the collar-sleeve (The bent-in-two-directions shoulder part.)
The cylinder part is not the problem. The rest of it is.

Any idea's what function I could use ? I am thinking of subtracting cylinders or torusses from something, but for now, no inspiration yet.
Any thoughts by specialists ?

(Yes I know it can maybe done simple in other tools, but I only now OpenScad a bit :-)

Thomas

Edited 1 time(s). Last edit at 10/16/2014 10:09AM by Replace.

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www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

Try this for a START:

$fn=100;

intersection()
{
	scale([1,0.75,1])
		cylinder(r=24, h=100, center=true);
		
	translate([0,0,50])
		cube([100,100,90], true);
		
	difference()
	{
		union()
		{
			translate([0,0,20])
				cylinder(r=12, h=20, center=true);
			translate([0,0,0])
				rotate([0,90,0])
					cylinder(r=20, h=40, center=true);
		}
		
		translate([0,0,21])
			cylinder(r=10, h=22, center=true);
		translate([0,0,0])
			rotate([0,90,0])
				cylinder(r=18, h=41, center=true);
	}
}

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Ahhh... the INTERSECTION command,

I had never played with that one before. Just learning OpenScad on the spot.

Thanks for the heads-up. This is great.

(How about my other attempts to imitate the MarkV parts? )

BTW, I love your way to make an oval out of a scaled cylinder.
I was used to hull 2 cylinders, but this renders probably faster :-)

Thomas

Edited 1 time(s). Last edit at 10/17/2014 07:37AM by Replace.

---

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

The hull() and minkowski() functions should only be used when absolutely necessary.
They are great and when you need it - USE IT, but if it can be done simpler, then DO SO!

Quote
Replace
How about my other attempts to imitate the MarkV parts?

Looks good!

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Quote
Replace
BTW, I love your way to make an oval out of a scaled cylinder.
I was used to hull 2 cylinders, but this renders probably faster :-)

A hull of two cylinders will not create an oval - it will have two straight sides (between the cylinders) rather than the entire perimeter being curved, and additionally the curved ends will have a constant radius rather than a continually changing curvature.

Dave

you can scale a cylinder by different multiples on different axes to get an oval.

whoops - I just read through the previous posts - my post was a bit redundant!!

Edited 2 time(s). Last edit at 10/17/2014 01:25PM by jbernardis.

Hi Rob,

thanks for the heads-up.
This is my result:



Thomas

---

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

Looks pretty nice. Good job!

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

I gave you the credit for this part on Thingiverse :-)

---

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Quote
Replace
I gave you the credit for this part on Thingiverse

...EXCEPT - You spelled my name wrong, there is only one (1) 's' in "rhmorrison".

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

I stand corrected
I apologise
I have made a correction immediately
I am sorry
I hope we can still be friends


Thomas
p.s. maybe it was a language thing :-)

---

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)