HELP! How do I trim a surface with a sketch?

mitchel_palmer
mitchel_palmer Member Posts: 20 ✭✭
in Community Support
So frustrated, have tried split and extrude but cannot seem to trim away this cylinder with rectangle sketch. Its a test so just want to trim off the top and bottom parts of the cylinder. SolidWorks is Extrude Cut, then choose what to keep, what is the Onshape equivalent?


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  • mitchel_palmer
    mitchel_palmer Member Posts: 20 ✭✭
    I managed to trim it by extruding the sketch as a surface, then splitting it, then deleting the faces...surely there is a much simpler way?!!
  • John_P_Desilets
    John_P_Desilets Onshape Employees, csevp Posts: 281 image
    edited August 2020
    @mitchel_palmer

    Here are a few examples.

    Split Face Example

    A line is sketched on the front plane. Next, the split command with the face option is selected. Using the sketched line as the split tool, the extruded surface is split into two faces, but remains a single surface. 


    Split Part/Surface

    A line is drawn on the top plane that extends past the extruded surface. Next, the line is extruded as a surface. Using the split part option, surface 1 is selected as the target, and surface 2 as the splitting tool. Once complete, two surfaces will be created. 

    Here is the public document for the examples. Good Luck!
    https://cad.onshape.com/documents/06c09487acacf981374cabe6/w/adfe5735740ff87c31f3ccee/e/ad97253a11747a62500d1e40






  • romeograham
    romeograham Member, csevp Posts: 779 PRO
    edited August 2020
    You could use Extrude - and select "Intersect" as the operation. Then select the cylinder body in the merge scope. That would work just like the SolidWorks extrude cut.



    [edit] 
    Oops, I just realized that you asked about a surface, not cutting a solid.

    I did it this way.
    Use a split FACE option, and use the sketch edges to split the cylindrical face:

    Then delete the faces you don't need.


    There will likely be more ways to do this too!
  • mitchel_palmer
    mitchel_palmer Member Posts: 20 ✭✭
    The above approaches do achieve the objective in the end. "Trimming" is a foundation surfacing tool, found in all popular CAD programs (SolidWorks, SolidEdge, Catia, ProE, Alias etc) , OnShape is incredibly advanced in so many areas, I find it hard to believe that this tool is missing and requires a "work around" of multiple steps to achieve it what should be a 1 step process.

    SolidWorks Below - Trim Tool - 1 Step

  • John_P_Desilets
    John_P_Desilets Onshape Employees, csevp Posts: 281 image
    @steve_shubin @mitchel_palmer

    Please feel free to submit an improvement request regarding the trim surface feature. 

    There is one other workflow as of today that can be used to split or remove surface geometry in Onshape. The boolean tool can use a solid part or parts to cut a single surface or several surfaces at a time. 







  • steve_shubin
    steve_shubin Member Posts: 1,118 ✭✭✭✭
    edited August 2020
    @mitchel_palmer

    And for the public in general — in the scheme of things, I don’t know if it’s all that much different than the way Solidworks does it

    SolidWorks Trim Surface is one longer dialog box to do the split and delete of unwanted faces


    Onshape has two shorter dialog boxes to do the same thing. But you don’t have to close the first dialog (Split) to start executing the second dialog (Delete face) and because of this, it almost acts like a single longer dialog box

    Take a look at the GIF below







  • t_e_s_t
    t_e_s_t Member Posts: 9 ✭

    It would be nice if they would put ability to pick the trimming or splitting sketch here. But for some reason it does not allow it.

    image.png

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