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How to delete faces from an import (solidworks or iges)?

reuben_kraftreuben_kraft Member Posts: 10 EDU
Hello,

I was able to successfully import a part from SolidWorks and want to edit the part. Some things I can do like extrude, split curves, etc. However, if I try to delete a face, the "Delete face" item under features is red and when I hover over it, it says " Delete face 1 did not regenerate properly: Select faces to delete"

I was wondering how I can do this. The reason I want to delete faces is to simplify or de-feature the part (I plan to send to simscale for simulation). My plan was to delete and add a simplified geometry component that is more easily "meshable".

Thank you.

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Answers

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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Thank you Jake for the fast reply. Here is the link:
    https://cad.onshape.com/documents/a4dae015a67dfc4426a9e0df/w/dcd99f9ba4b00eb472e5c793/e/f4cd6897690bdf6455b486d6

    I was trying to delete any of the outside faces. I think you may be right that this is the topmost face of a protrusion, but I am not sure where the base sketch started. 
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    Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,646
    Reuben,

    See my edit.  Are you sure there are actually any faces selected for the deletion?
    Jake Rosenfeld - Modeling Team
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Yes. I believe so. It appears in the delete faces box "Face of Import 1". See attached image.
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    Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,646
    Hmm strange,

    I'd like to try a couple things, is there any chance you can make the document public so I can copy it and play around? If you'd rather not you can file a support ticket by clicking '? -> feedback' in the upper right corner of the document.
    Jake Rosenfeld - Modeling Team
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Done.  Document is now public.
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Also, here is link where the original SolidWorks part can be downloaded.
    https://drive.google.com/open?id=0B2jKCiWMO3weZEQxNmRrUzlOYWs

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    Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,646
    Hi again :)

    I defilleted everything just so you could see how it's done.  Let me know if this isn't what you meant to do:

    https://cad.onshape.com/documents/58c051f8e493aa0f85abe0cc/w/fbe091f472b0f64e5348c638/e/cbd31a606b5bda61d936d303

    If you want to be able to see the inputs to the features by rolling back/double clicking on them, you can copy the document back from me.
    Jake Rosenfeld - Modeling Team
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    brucebartlettbrucebartlett Member, OS Professional, Mentor, User Group Leader Posts: 2,137 PRO
    It will not delete the face because this would cause the solid to become non-manifold. If try the fillet this work perfectly.

    You could use the move/create face command and convert all other faces except this to surfaces to but not sure that's what you are really after.

    I think what you want is just to extrude the face in with a remove, is this the result your looking for.
    https://cad.onshape.com/documents/58c0538015bae2107af929d9/w/530b09d343b9976a228105a6/e/72830c3d67b81962fba02e53


    Engineer ı Product Designer ı Onshape Consulting Partner
    Twitter: @onshapetricks  & @babart1977   
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Kind of, I am interested in your steps to defeature. How would I do that?  However, when I select a face from your version and try to delete it I get the same issue. Let's say I wanted to delete the faces on the circular protrusion on the model, so this would make the outer surface like a box without a protrusion. I know that there are faces associated with the geometry that will need to be closed up if I delete certain faces, but it seems like onshape does not want me to delete certain faces that create holes? Is that the issue?

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    Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,646
    Reuben,

    I don't think delete face is the right workflow for this because it is not a solid protrusion. I've done what you want with 2 'Move face' features:

    https://cad.onshape.com/documents/58c051f8e493aa0f85abe0cc/w/fbe091f472b0f64e5348c638/e/cbd31a606b5bda61d936d303
    Jake Rosenfeld - Modeling Team
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Hi Jake and Bruce,

    Yes, thanks so much. I think I understand what you both are saying with the 2 move successive commands. I played around with it a bit and see how that would work, although I am not sure how you sealed up the hole. This problem is a practice for what I am really trying to do and that is to remove a similar structure but is threaded. I have a circular piece of a part that looks just like this but has threads. I want to remove the threads so I simplify and can make a finite element mesh. 

    So next question, is how would you remove complex faces like are on threads? Sorry for all the emails, but I think this sort of thing would be useful for the general community.
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
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    NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,362
    You should box-select the entire thread area and unselect the end face to delete the entire thread - you would then need to add the chamfer back afterwards.
    Senior Director, Technical Services, EMEAI
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Thank you, Neil. I would love to do this, but I get the same error like "Delete face 1 did not regenerate properly: Select faces to delete". See attached image. I think Onshape does not like that this would create a hole, which I understand, and I want to fix, but I need to see the hole before I fix it. 
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    reuben_kraftreuben_kraft Member Posts: 10 EDU
    Got it! Thanks. I think maybe one issue I was having was when I de-selected the end face, I was actually de-selecting one of the back edges, which blocked the operation. Thanks so much for all the help.
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