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How do i create an impression of a CAD model or invert the CAD?

Question asked by Tracy Martin on Apr 16, 2015
Latest reply on Apr 20, 2015 by Deepak Gupta

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I have CAD of a component, and i want to create a nest for that component (to 3D print the nest) how do i invert the cad so i am left with a block with the impression of the part in the block? I only need half of the part indented into the block, i thought it would be easy to invert the CAD so was left with an impression of the part but not finding it easy, in fact not managing to do it at all, any help would be appreciated step by step help for a novice Just like pushing a penny into clay and the impression is left, that's what i want to do virtually with CAD. Thanks

Deepak Gupta Apr 17, 2015 8:07 AM

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Not sure but check if this is something that may help. You can modify the file further as required.

Added one more version with impression for the base.

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Greg Hynd Apr 16, 2015 10:45 AM
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Look into using the cavity tool. If you can post the part I will do a sample for you.
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- Tracy Martin @ Greg Hynd on Apr 17, 2015 3:18 AM
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  Hi Greg,
  I have uploaded the CAD here Par_00051425_CP - Download - 4shared
  I'll have a fiddle with the cavity tool, i did try to create a cavity, but the orientation of the part it wasn't creating the split line where i wanted it, i want the flat 'A' face of the part to sit into a nest and the arm that leads up in an angle to also be supported, i was trying to create a block and just move the part into the block where i wanted it orientated and leave an impression, but nothings ever as simple thanks everyone i appreciate the replies
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Deepak Gupta Apr 16, 2015 10:48 AM
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If you have that as a part then create a block using extrude and don't merge it. Then simply subtract the body from the block.
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- Jamil Snead @ Deepak Gupta on Apr 16, 2015 8:15 PM
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  When Deepak suggests to subtract the body I think he is referring to the Combine feature using the Subtract option (maybe counter intuitive).
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- Tracy Martin @ Deepak Gupta on Apr 17, 2015 2:58 AM
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  Thanks Deepak, I tried extruding but it will only extrude flat surface and not all around the edges etc, i'm a complete novice to solidworks and don't really know what i'm doing, i thought it would be easier than it is, thanks for the help.
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  - Greg Hynd @ Tracy Martin on Apr 17, 2015 3:31 AM
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    Have a look at the attached. If you show the hidden body and rollback the feature tree to see what I did. I used the intersect tool in this example.
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    test.SLDPRT.zip81.0 KB
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    - Tracy Martin @ Greg Hynd on Apr 17, 2015 6:53 AM
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      arr thank you Greg I will try this now
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  - Deepak Gupta @ Tracy Martin on Apr 17, 2015 3:34 AM
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    Can you attach the file or screen shot show how is the part geometry.
    
    Check #18 here on how to attach files here: Forum Posting
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    - Tracy Martin @ Deepak Gupta on Apr 17, 2015 6:53 AM
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      Hi Deepak,
      
      Thanks, Attached is image of what i'm trying to do, i wanted to just push the impression of the CAD into a block then cut out little bits that I need access to with CMM probe, as below. The arm itself i could extrude down and the sides so that was perfect but the flat square base is slightly curved and it just wouldn't let me extrude, or rather i didn't know how to extrude something that's not a flat plane.
      
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      - Deepak Gupta @ Tracy Martin on Apr 17, 2015 7:00 AM
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        You can use other surface to create the sketch and extrude. Can you attach the file here (instead of external link) and I can have a look at it.
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        Tracy Martin @ Deepak Gupta on Apr 17, 2015 7:10 AM
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        Step file attached, is this format OK? Really appreciate all the help, thanks
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        LCM1479.stp.zip912.7 KB
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        Deepak Gupta @ Tracy Martin on Apr 17, 2015 8:07 AM
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        Not sure but check if this is something that may help. You can modify the file further as required.
        
        Added one more version with impression for the base.
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        LCM1479 with Base2.zip1.4 MB
        LCM1479 with Base.zip1.3 MB
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        Tracy Martin @ Deepak Gupta on Apr 17, 2015 8:25 AM
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        thank you so much, that's a great start for me, exactly what i wanted, i'll look through the features on yours and try and work out how you did that, and so quick, i've been on days with this already
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        Deepak Gupta @ Tracy Martin on Apr 17, 2015 8:35 AM
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        The uploaded files are not native SOLIDWORKS files but those are STEP files. I can upload SW2015 files if those can help.
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Tracy Martin Apr 17, 2015 8:59 AM
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yes that would be a great help, thank you i'll 3D print the one you did for me on Monday when i'm back at work and i'll see how it works, i'll let you know
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- Deepak Gupta @ Tracy Martin on Apr 17, 2015 10:31 AM
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  Here is the 2015 version file. Please move the bar to end to see all features.
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  - LCM1479-SW2015.SLDPRT.zip2.2 MB
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Tracy Martin Apr 20, 2015 9:02 AM
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- Deepak Gupta @ Tracy Martin on Apr 20, 2015 10:45 AM
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  If you've SW2015 version then you can increase the side height. I didn't kept it high as I thought you might want to measure from sides.
  
  How much height you would need? I had kept it .25mm and now increase it to 1.5mm (same height as the part. Attached are both parasolid and SW2015 files.
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  - LCM1479-SW2015-Parasolid.zip1.0 MB
  - LCM1479-SW2015.zip907.3 KB
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How do i create an impression of a CAD model or invert the CAD?

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