Extruding and joining to a curved surface

[andygrigg]

Hi all,

I'm trying to extrude the highlighed surface up to meet the two tubes above, but I want it to create a blind hole with those surfaces. It's kind of the inverse of an intersection. I just want the extrusion to conform to the external surface profile of the two tubes so that it only acts as a support for the tubes above. Can anyone advise please?

[g-andresen]

Hi,

please share the file for reply

File > export > save as f3d on local drive >attach to post

günther

[wersy]

This should go with extrusion "To Object"

If needed with "Taper Angle".

[andygrigg]

Ahah, great. Thanks! Alas, it doesn't work for this specific model as it throws an error that the "Extrusion profile falls outside the boundary of the selected body". I think this will work if I split the bottom cylinder in half and extrude the two sides inidividually. Thanks for your help.

[wersy]

Right, I hadn't thought of that, an extrusion only works on one surface.
The profile to be extruded must be split.

[andygrigg]

Actually, that didn't work either. I did a workaround. Extrude all the way inside the tubes above and then use the tubes as the tool to split the body of the newly extruded part, and remove the excess.

[TheCADWhisperer]

@andygrigg 

You should no t start with tubes.

Model solid and then use Shell feature to get the tubes.

Are your sketches fully defined?

[jeff_strater]

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@wersy wrote:

Right, I hadn't thought of that, an extrusion only works on one surface.
The profile to be extruded must be split.

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That is not entirely true.  To Object only works on a single body, but you can extrude to multiple faces on that body by selecting the body, not a single face.  I can't tell if the original model is one body or not, but if so, you should be able to make it work, providing the profile does cleanly intersect the body (the other source of this error is if the profile is too large, and does not intersect the body)