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Why can I not extrude from a plane contained inside a solid? (cannot extrude from an inside plane)

yehia_boctoryehia_boctor Member Posts: 4
Examples on YouTube shows it is doable, but it is not allowing me to do it. It is allowing me to draw on the plane I created or was a primary plane (was contained inside my solid). But once I accepted the sketch I created (just a simple circle or a polygon) it turned to dashed lines and would not extrude. I have split the solid with my sketch plane, drew my sketch, extruded it with a remove or an add, then united the two parts of the solid again. I am sure there is an easier way of doing this. Is there something wrong (maybe) with the defaults that I am operating under, that I am not aware of that is not allowing me to do this.  I know it is doable (I've seen it on YouTube), so, why is it not allowing me??? 


  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,060
    The solid is just obscuring the selection of the sketch - either select the sketch from the Feature list or use "Select other" to pick through the solid geometry. https://cad.onshape.com/help/Content/select-other.htm?Highlight=select other
    Senior Director, Technical Services, EMEAI
  • Matt_ShieldsMatt_Shields Member Posts: 142 PRO
    "Select other" is powerful!  I also sometimes just hide the parts that are obscuring my sketches.

  • yehia_boctoryehia_boctor Member Posts: 4
    Thank you, Matt, for your response. I tried to reproduce what you demonstrated but, every time when I try to define what I am trying to extrude, it does not show it as available to click on.  It would allow me to highlight the borders of the shape only, and thus it would extrude a surface?!?! I could not get it to highlight the area to extrude a solid. How can I make a short video like the one you did to show you what I am going through. 
  • steve_shubinsteve_shubin Member Posts: 1,054 ✭✭✭✭
    edited September 2022
    But once I accepted the sketch I created (just a simple circle or a polygon) it turned to dashed lines

    If the lines are dashed, then the polygon is probably not showing a shaded fill within its' borders
    If that is the case, then you will not be able to make a SOLID EXTRUDE

    So you need to change the dashed lines to SOLID lines
    Once you do that, then there will be a shaded fill within the borders of the polygon, and you will then be able to make a SOLID EXTRUDE

    Another possible reason could be that you sketched a polygon that did NOT make a fully enclosed shape
    If a sketch is fully enclosed, there will be a shaded fill to that shape, and then that shape can be used to make a SOLID EXTRUDE

    Also, make sure extrude is set to SOLID

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