Split/edit part in FreeCAD?

  • I'm trying to modify some parts on this thing. I'm kind of new to dealing with the modeling aspects of this.



    I am attempting to widen the part essentially 3mm. This would involve modifying the chain segments, and the anchor points.



    I have already attempted this with 3D Builder and the result was less than stellar. I split the part, cloned off about 3mm of the middle of the X-Chain (including the top & bottom bits). The intent was to break the part, translate one of the halves off 3mm, add back the 3mm into the gap.



    When I put all the parts back together and merged them in 3D Builder, the resultant model, while visually on screen appeared to be one piece, the slicing proved otherwise.



    Is there a way that I can do the above in FreeCAD? I'm learning this so tutorial links would be more than sufficient. But if there is someone who can explain this process to me in FreeCAD that would also be appreciated.


  • Dave G

    Dave G Correct answer

    3 years ago

    I found that the answer provided by @Marco was helpful but not the correct answer I was looking for.



    Here is the general approach I used (Based on this).




    1. Create new document

    2. Import STL file

    3. Switch to Part workbench

    4. Select imported mesh

    5. Part -> Create Shape from Mesh (use default tolerance)

    6. Delete imported mesh

    7. Select shape

    8. Part -> Refine Shape

    9. Delete "unrefined" shape

    10. Select refined shape

    11. Part -> Convert to Solid

    12. Follow instructions in link provided.



    Below is the list of instructions from #12




    1. Have shape loaded

    2. Switch to a plane that you would like to cut parallel to. e.g. XZ

    3. Switch to Draft workbench

    4. Draw rectangle around item to cut

    5. Upgrade using '^' up arrow (blue) in toobar

    6. Adjust the Placement Angle/Position via the "Data" in the property editor lower left side.

    7. Switch to the "Arch" workbench

    8. Double click the solid to cut in the 3d view

    9. Ctrl+click the plane you will cut with

    10. Select "cut-plane" and choose which side to capture



    You will have to play around with the pattern in 12. The idea is to use the same Face created through 12 to cut the part at the same point twice. To create two halves. Take note of the position of the Face created in 12.



    In my case, I was attempting to stretch the part along the Y axis, so I was able to cut the part with an XZ plane (created in 12) and offset with a distance in the Y plane.



    After performing this "split" I created a cross-section of the at the point of the cut and extruded the cross section 3mm.



    Afterward, I was able to use the Edit -> Alignment tool to attach all three parts back together.



    Once attached, I selected all three and performed a "union" operation to make them all whole again, then executed the Part -> Refine shape.



    End result was that I could make the chain links 3mm wider than the original.



    I'm still working on tweaking out the other components that constitute this feature but still this is an interesting exercise.


    Maybe you can get the essentials from the link and post them also. If the link dies, splitting the part is then not addressed in the answer.

    @0scar - I will detail that a little later today thanks for the request

    @0scar - sorry for the huge delay - I paraphrased the steps on that site

License under CC-BY-SA with attribution


Content dated before 7/24/2021 11:53 AM