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split entities

Question asked by 1-39SHIM on May 6, 2008
Latest reply on May 7, 2008 by J. Venema

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Sometimes while sketching I am unable to trim a line without eliminating some pertinent dimensions/constraints. I try using the split entities command and then switch the unwanted portion to a construction line. However, when I then try to do an extrusion I always get a message box telling me that I have open contour. Is this a glitch or am I not using the command correctly?

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Tim Ludy May 6, 2008 3:52 PM
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Extrusions can only be made with non-construction lines.
You might try sketching points and dimensioning to them if a change needs made.
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- 1-39SHIM @ Tim Ludy on May 6, 2008 5:51 PM
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  Maybe I should clarify. If you imagine a square corner with everything fully defined it would be like me drawing a line at an angle to chamfer it so to speak. So I need to get rid of the parts past my new line to make the proper extrusion profile as this provides multiple closed contours. Trimming them typically works, but depending on how things are dimensioned I would prefer to leave them so that the constraints/dimensions remains. I can use split entities to split the line at the intersection point and then turn half to a construction line, but when I do it still claims that there are multiple open profiles, which visually at least there is not. So I don't know if I am using the command differently than it is intended or if its a glitch of some sort.
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  - Charles Culp @ 1-39SHIM on May 6, 2008 6:35 PM
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    It only splits one line per click, so maybe you have to split twice, one for each line segment. Click on the line segments to see if they split properly. You will highlight the entire segment, to see how long it is.
    
    Additionally, you can also use the "selected contours" functionality to select only the main area for your extrusion.
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    - 1-39SHIM @ Charles Culp on May 7, 2008 12:29 PM
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      It splits the lines, and in my "chamfered" corner example, the sketch would look like a box with one chamfered corner, all in solid lines, and then the unwanted portions are switched to construction lines, so visually the sketch looks to be a closed sketch. If I start a new sketch and convert entities of the chamfered corner box it will let me do the extrusion without the open contour message. For whatever reason I don't think that solidworks recognizes that the two split entities share a common endpoint with the chamfer line.
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      - Charles Culp @ 1-39SHIM on May 7, 2008 12:31 PM
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        If you upload your example, someone will be able to tell you exactly what's wrong.
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      - 1-39SHIM @ 1-39SHIM on May 7, 2008 12:33 PM
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        I just did a little experiment. If I draw the square and split the lines and then draw the chamfer line, the extrusion works as normal. When I draw the chamfer line and then split the lines at the endpoint of the chamfer line, the split works, but then I get the open contour problem when trying to extrude.
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        J. Venema @ 1-39SHIM on May 7, 2008 12:49 PM
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        when you do the second option, when you split the second line the line stays in one piece, you have to do it two or three times, then it splits
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