Funny looking corners on a rolled sheet metal part

[mrattray]

I made this part:

And I noticed this artifact:

This is how I made it:

Thoughts?

It's not there in the flat, nor is it visible in the drawing. It's not affecting my work at all, but I thought it was worth asking about.

[jletcher]

I do my cuts a little diff than you mine is ok take a look.....

[jletcher]

I think it comes from the radius you did before you refolded the part. try to do it after you refolded the part..

[JDMather]

---

@mrattray wrote:

Thoughts?

---

The part could be made with two features.
Contoured Flange
Cut (Across Bend)  - with a trick.

[mrattray]

I tried using cut across bend. I got an error message that I can't use it on a sketch that lives on a workplane. What's the trick?

[Yijiang.Cai]

I am really interested in the result you showed in the image. Could you attach the dataset for more investigation?

[jletcher]

Here is a contour flange with cut.

[mrattray]

What's with the little flat tittie there on the contour flange?

[JDMather]

That planar face is needed for Cut Across Bend as it cannot be done from a workplane.  (sketch must be on a part face)

It could have been removed as part of the Cut Across Bend. (cut it (with a rectangle) and your rectangular hole at the same time)

I normally make it a little larger (so easy to see) and then make the dimension really small after part created.

(attached saved in student version - delete after examination and re-create)

[mrattray]

I figured as much, but that doesn't seem like a good technique to me. I assume this is the trick you mentioned earlier. How is this a better technique then the one I used?

[JDMather]

This is the way we did it before UnFold/Refold existed.

Check the file size using both techniques (and the fillets could be added in the Cut sketch).

[mrattray]

The difference in file size is 80kb, or 21%. I think in terms of modern storage mediums, 80kb is pretty much neglegible. However, I can see how it could be a much bigger difference on a large complex part. I think I would consider it a better technique if it didn't require the tittie at the end of the roll.

I know the rounds could be in the sketch, but I feel that having them as a seperate feature makes them easier to edit, especially if I ever needed to remove them. Do you have a good reason for them to be in the sketch, and a trick to deleting them without having to deal with disconnected lines?

[jletcher]

I agree with you I never use sketch radius for the reason you mention. The only time I do is for sweeps or lofts..