Round cover

fma

Hi!

A friend is trying to make a round cover to a part. We made something not too bad with a loft, but it was painfull, and the result is not perfect:

https://cad.onshape.com/documents/c59229da58fd8739ac0370f8/v/3f1a24f99dfa248f8d3cb801/e/3401ba69fb0a857f5dfa1b37

Is there a better/easier way to do it?

Thanks,

konstantin_shiriazdanov

I think you need Fill command

konstantin_shiriazdanov

when using Fill you should make sure that fill contour pierce the ends of the guide curves and if you have a pair of intersecting giudes you should make sure that they intesect each other in the space.
https://cad.onshape.com/documents/41b98f535bfcb53606253219/w/c44d6e45cc03a2f13a534069/e/0d7c383fd13a90fd74c90097

MBartlett21

@fma
@konstantin_shiriazdanov

I think it is bad usage.
Add can only be used to add to another surface.

I have a solution where I deleted the other face beforehand here, resulting in a shorter feature list.
I used 'add' when I filled the surface, making it merge with all. The feature then makes a part.

konstantin_shiriazdanov

I think you need Fill command

fma

Thanks! I'll give it a try...

fma

Ok, it works much better:

https://cad.onshape.com/documents/c59229da58fd8739ac0370f8/v/f9ec95b196ba03b267dc893d/e/e3ccf56619725ea20975b4d7

But I get a surface, and have to use the Enclose feature. But Enclose is tricky, and often don't want to work, depending on the spline defining the flat surface (if I move a point, it fails). So:

- how to get a part from Fill?
- how to get Enclose work fine?

fma

and as you can see, the Enclose does not match well the spline...

konstantin_shiriazdanov

when using Fill you should make sure that fill contour pierce the ends of the guide curves and if you have a pair of intersecting giudes you should make sure that they intesect each other in the space.
https://cad.onshape.com/documents/41b98f535bfcb53606253219/w/c44d6e45cc03a2f13a534069/e/0d7c383fd13a90fd74c90097

fma

Ok, I understand. But even on your design, there is a little mismatch at the top. And the Fill does not generate a part (boolean fails); why?

konstantin_shiriazdanov

boolean doesn't fail in my example, fill exactly matches contour curves and boundary conditions i specified, if you need something other you may vary the shape and number of guides or continuity

fma

I mean Fill fails if you use Add: it says 'Surfaces do not share an edge and cannot be added.' I tried with a clean example, and I always get this error...

konstantin_shiriazdanov

i would report a bug about this, it fails for me too

fma

Is it really a bug, or a bad usage from us?

MBartlett21

@fma
@konstantin_shiriazdanov

I think it is bad usage.
Add can only be used to add to another surface.

I have a solution where I deleted the other face beforehand here, resulting in a shorter feature list.
I used 'add' when I filled the surface, making it merge with all. The feature then makes a part.

fma

I see! Thanks!

MBartlett21

That's fine

MBartlett21

@fma

Just make sure, when you delete the face, don't tick delete fillet faces because the fill feature fails if you do.

EDIT: With the Delete Face feature, I selected "leave open" in the drop-down list

EDIT 2: I also updated the example document above for both tabs (click on the text "here,")

fma

Yes, I experimented these two warnings ;o)

MBartlett21

fma said:

Yes, I experimented these two warnings ;o)