topic Re: cutting cylinder in Fusion Design, Validate & Document Forum

cutting cylinder

Anonymous — Mon, 04 Apr 2016 13:47:40 GMT

A noob question; I am trying to cut 22 mm cylinder with 110 mm diameter sphere. I have gone through the tutorials, but to no avail. I am trying to create a cylinder, and then a sphere for cutting but couldn't cut the cylinder with the sphere. Also having very hard time to align objects. Coming from rhino, I am really stuck with alignments.

So the sphere has to cut the cylinder from its right base and 22 mm from right end, top corner. Any leads I will appreciate, it's so annoying that I couldn't succeed in such a basic operation 😕

Re: cutting cylinder

HughesTooling — Mon, 04 Apr 2016 13:57:45 GMT

One way is to use 2 sketches and 2 revolves. First draw half of the cylinder then in another sketch draw a D shape for the cross section of the sphere, use constraints and dimensions to get the positions and sizes. Revolve the sketch of the cylinder then revolve cut he sketch of the sphere.

Mark

Re: cutting cylinder

HughesTooling — Mon, 04 Apr 2016 14:32:11 GMT

Here's a screen grab of what you need. I'll do a screen cast in a minute as there's some thing odd going on with the constraints for the D shape.

Mark.

Edit changed screen grab, found I'd made a mistake

Re: cutting cylinder

Anonymous — Mon, 04 Apr 2016 14:30:25 GMT

Hi Mark, thanks for your response. I have drawn everything and I think the only thing I could not succeed is aligning the D shape with the dots of the cylinder.

Probably that is my core problem from the onset.

Re: cutting cylinder

Anonymous — Mon, 04 Apr 2016 14:32:27 GMT

ah got it!

I just have to use the coincident from constraints!

Re: cutting cylinder

Anonymous — Mon, 04 Apr 2016 14:33:19 GMT

Would it be also possible to do the same thing by sculpting?

Re: cutting cylinder

HughesTooling — Mon, 04 Apr 2016 14:42:14 GMT

@Anonymous wrote:

Hi Mark, thanks for your response. I have drawn everything and I think the only thing I could not succeed is aligning the D shape with the dots of the cylinder.

Probably that is my core problem from the onset.

In your picture below you have a couple of problems. 1 the diagonal line has a constraint to the midpoint of the top line of the rectangle. This will stop you adding the 22mm dimension. Just select the triangle constraint icon and delete. the other problem is the height of the rectangle should be the radius of the cylinder. I've done a screencast should be ready soon that makes it all a lot easier to follow.

Re: cutting cylinder

HughesTooling — Mon, 04 Apr 2016 14:57:59 GMT

OK here's a screencast that shows how to make your part. At 2 minutes in I demonstrate a bug where the sketch of the D shape should be fully constrained but I can still drag it. @jeff_strater can you take a look at the file.

Mark

Re: cutting cylinder

HughesTooling — Mon, 04 Apr 2016 15:07:16 GMT

@Anonymous wrote:

Would it be also possible to do the same thing by sculpting?

This is not really something you'd use sculpt for unless you want to deform it in some way. Making it in the model work space makes it parametric so you can edit the sketches and the model will update. You can use the same sketches in the sculpt workspace to make the same part but the sculpt bodies are not linked to the sketches so edits to the sketch don't update the model.

Mark

Re: cutting cylinder

HughesTooling — Wed, 06 Apr 2016 16:41:15 GMT

@jeff_strater did anyone take a look at the file and screencast in post #8, there's a strange bug where the sketch should be fully constrained but I can drag part of the sketch, when I let the sketch go it snaps back into place!

Mark

Re: cutting cylinder

jeff_strater — Wed, 06 Apr 2016 17:42:05 GMT

Thanks for the reminder, @HughesTooling. It's been on my list to check out. Since I'm doing "Answer Day" today, that gave me an excuse to look at it.

I agree that this seems like a bug. When I tried this on my own, I definitely saw it the first time. But, when I went back to try again, I could not reproduce it. I'll keep looking at it, though, and once I found the magic sequence, I'll report the bug,

Jeff

Re: cutting cylinder

HughesTooling — Wed, 06 Apr 2016 17:51:27 GMT

It seems to be something to do with using a full circle drawing the line across, constraining to the center point then trimming. When I made the same sketch by drawing the horizontal line 110mm long first and used a center point arc all the lines turned white.

Mark