How to add features to a donut at specific angles?

[The_Dutchman]

Hi there,

I'm a very fresh newbie user of F360 and would like some advise on how to create the following shape:

I can create a donut shape (that's easy) but need to add two features onto the donut at two specific locations. I've attached a little sketch to explain:

- Front view: the two features need to be spaced at 30 degrees from each other, using the center of the donut.

- Cross section view: each featue needs to be located at 60 degrees using the center of the donut 'tube'.

Please list the steps I need to take to achive this.

Thanks!

Randall

[g-andresen]

Hi,

try this

günther

[chrisplyler]

Use planes to define sketch locations. Use dimensions in those sketches. Create dependencies as required. With this combination you can achieve precise point locations on the surface of the doughnut.

Give me a minute and I'll make you a little video.

[chrisplyler · Accepted solution]

Ooops...went to a doctor appointment and totally forgot about this. Anyway, here is your video...

I don't know what features you want to put at those two points, so I didn't go that far. I just got the points set up and planes on them, so you could continue with the features from that point forward.

Notice my use of the Project tool to create dependencies between sketches, such that a dimension change on one plane moves the other sketches appropriately to achieve the desired result.

https://knowledge.autodesk.com/community/screencast/7fd93040-56f6-481b-aba1-c92a6098bed5

[The_Dutchman · Accepted solution]

Thanks for you advise, I'll give that a try tomorrow.

[The_Dutchman]

Thanks for you advise, I'll also give that a try tomorrow.

[The_Dutchman]

Thanks ChrisPlyler. 

I just have one question about creating the two last planes: I used Construct/Plane Along Path. To get the planes tangent to the surface of the -half- donut, I had to physically specify the radius of the donut. Is there a way to define the plane to remain tangent to the donut if I change the diameter of the donut?

Thanks again for your help!

[chrisplyler]

Watch my video again carefully.

1. Notice that I sketched one circle to define the radius (in my case the diameter actually) of the torus.

2. Then I set up the planes that cut the cross sections 30-deg apart, and sketched on those.

3. On those two sketches, I used Project>Intersect to capture the diameter again, giving me purple circles.

4. Then I put lines through those purple circles, and made the endpoints of those lines Coincident to the circles.

5. I also used Plane-on-a-Path to establish the tangent planes at the end.

So when I change the diameter of the torus with the dimension in the first sketch...

1. The two projected circles also change, and...

2. ...so does the length of the lines passing through them, and...

3. ...so does the position of those tangent planes. They always stay tangent to the torus surface no matter what.

[chrisplyler]

https://knowledge.autodesk.com/community/screencast/873c2ae9-9878-483e-b76a-e6b571e13ab8

[The_Dutchman]

Got it worked out, Thanks!