Create tub from custom shape

[ianjameswaters]

I am new to Fusion 360 and CAD in general so apologies if this is a simple question. I have this shape I have created in a sketch.  I want to extrude it upwards, and then push the centre down so it basically becomes a tub, with walls about 4-5mm think.  Can someone please point me in the direction to do that?

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[jhackney1972]

The Forum users can help easily but we do not have your model, including the form you desire.  Please attach it to your post.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save to your hard drive. Then use the Attachments section of a forum post to attach it.

[TheCADWhisperer]

Extrude and then Shell.

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[ianjameswaters]

Thanks, I did try exude and shell but could only get it to create a shallow dip.

File attached

[jhackney1972 · Accepted solution]

You sketch is not constrained and not related to the model origin.  I did not take the time to dimension it but that is an important step in modeling.  Take a look at the Screencast for the method I would use.  Model is attached.

[ianjameswaters]

Perfect thank you.  I will have a look into the constraining as well.  I was just throwing some ideas round and wanted to quickly see what it would look like, but struggled at the first part!

[davebYYPCU]

Thin wall Extrude will eliminate your new sketch, but his sketch is not clean enough.

Clean the sketch and Shell will work.

@ianjameswaters Check the tangency results for these locations. (Zoom in)

Might help....

[TheCADWhisperer]

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@ianjameswaters wrote:

I was just throwing some ideas round and wanted to quickly see what it would look like....

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In my experience (of nearly 30 yrs) this is NOT the quickest technique.

Discipline!

The best quality, and the FASTEST users that I see do not "just throw geometry" around.

In my experience those who use your technique get into bad habits and become fast at creating rubbish.

As @davebYYPCU has shown (or you will see if you follow his instructions) your "fast" technique has resulted in geometry that is not high quality and causes Shell to fail.

1. Make use of obvious symmetry about the origin.

2. Fully define your sketches - with a bit of practice this becomes automatic and does not take any additional time.  Use dimensions that are easily measurable and manufacturable.  Blue geometry should keep you awake at nights.

If you can't get a sketch fully defined - STOP - and ask questions here.  (I think you should practice with this sketch.)

3. It is usually better to add Fillets as features rather than as sketch elements. (Not always, but usually.)