topic Re: Extruding (removing) 3/4 from the surface of a hollow cilinder in Fusion Design, Validate & Document Forum

Extruding (removing) 3/4 from the surface of a hollow cilinder

Anonymous — Tue, 03 Dec 2019 18:54:46 GMT

Hi all,

I'm a total newbie in Fusion 360 and I am working with the application for 2 months now. And boy, has Fusion 360 got a steep learning curve. The last 2 days I was trying to remove 3/4 from the surface of a hollow cilinder by extruding this piece. To accomplish this I put a rectangle over 1/4 of the top of the circle that I want to keep. The first time I succeeded and could extrude the intersection of rectangle and circle. All screenshots are made in Sketch Mode topview and screenshot 1 is showing this step of the process in which I succeeded. With the second cilinder I proceeded exactly in the same way as I did in the first one but now I can't execute the extrusion. In screenshot 2 you can see that the interaction between circle en rectangle is working out in a totally other way. Screenshot 3 is an example which is showing the extruded cilinder. I already searched the learning videos and documentation for a few days but I can't find a solution for this problem. I presume this has something to do with Constrains? Whatever I tried to solve this, it did not function. I also noticed that the top left yellow/orange circle of the first tube is slightly lighter as the other 3 circles?

Thanks,

Jeu

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

chrisplyler — Tue, 03 Dec 2019 19:02:33 GMT

Screenshot 1 shows your blue circle profile overlapping the walls of the cylinder. Screenshot 2 shows your blue circle profile only on the interior hollow part of the cylinder, not overlapping the walls of it.

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

Johnc911 — Tue, 03 Dec 2019 19:50:22 GMT

I have a feeling it has something to do with the rectangle not intersecting the circle sketch in the three that don't work.

Instead of using a rectangle, why not use some little construction lines to delineate the quarter circle in the sketch.

See examples.

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

TheCADWhisperer — Tue, 03 Dec 2019 20:22:16 GMT

File>Export and then Attach your *.f3d file here.

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

davebYYPCU — Tue, 03 Dec 2019 20:11:49 GMT

You are working too hard. Use Fusion to do the hard yards,

Go back in the timeline, make the first finished cylinder, then

Solid > Create > Circular pattern, selecting the features you used to make the first finished tube. Set 360 deg and 4 in the pattern.

Might help....

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

Anonymous — Tue, 03 Dec 2019 23:29:10 GMT

Thanks for your help, this could work I'm going to try this later to learn from it. But I just found out that I didn't constrain all parts of my sketch. I made a new sketch, followed the constraining rules and succeeded in making the extrusions I needed.

I did it the way you described and that is the simplest way to do this. Simple and affective.

Re: Extruding (removing) 3/4 from the surface of a hollow cilinder

Anonymous — Tue, 03 Dec 2019 22:46:36 GMT

Thank you for your files, I attached the f3d file of the new design I just made. The extrusion was successful this time because I constrained all parts of the sketch. It should become a (cooling)stand for my Mac mini