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.dxf import - Closed entity not creating a face to extrude
Hi,
First time trying to use an import.
I get it into the file just fine but the shape is not a closed pline, it's made up of splines, arcs etc. however all the endpoints are snapped together.
When imported it comes in just fine but does not create an enclosed body to extrude - I can only make a cookie cutter out of the edges. See screenshot.
I'm sure there is a way to fix this either on the 2d file or in onshape. Any ideas?
I'm pretty sure the issue is the Splines and it not being a closed polyline but don't know how to fix that.
(
(in the screenshot there are 2 copies of the sketch as I was messing around)
First time trying to use an import.
I get it into the file just fine but the shape is not a closed pline, it's made up of splines, arcs etc. however all the endpoints are snapped together.
When imported it comes in just fine but does not create an enclosed body to extrude - I can only make a cookie cutter out of the edges. See screenshot.
I'm sure there is a way to fix this either on the 2d file or in onshape. Any ideas?
I'm pretty sure the issue is the Splines and it not being a closed polyline but don't know how to fix that.
((in the screenshot there are 2 copies of the sketch as I was messing around)
0
Best Answer
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andrew_troup
Member, Mentor Posts: 1,584 ✭✭✭✭✭
@Eric_92
It may look closed, but the inability to extrude is pretty much a smoking gun for it being open, in fact it's the one of only two diagnostic tools I'm aware of which we currently have. The other is to click within the boundary: if it's closed, the area within it will darken to grey.
In traditional MCAD there is usually some sort of "chain selection" which halts at the first break, identifying where to look.
Another peculiarity of Onshape is that endpoints which coincide are not a sufficient condition for the entities terminating in them to be considered joined, but it seems that the least laborious way to remedy this is to "Use/Project" the sketch to a fresh sketch. You may find you can extrude that as a closed boundary.
If this does not work, you will need to zoom in very deeply at each endpoint looking for gaps.
5
Answers
Indaer -- Aircraft Lifecycle Solutions
It may look closed, but the inability to extrude is pretty much a smoking gun for it being open, in fact it's the one of only two diagnostic tools I'm aware of which we currently have. The other is to click within the boundary: if it's closed, the area within it will darken to grey.
In traditional MCAD there is usually some sort of "chain selection" which halts at the first break, identifying where to look.
Another peculiarity of Onshape is that endpoints which coincide are not a sufficient condition for the entities terminating in them to be considered joined, but it seems that the least laborious way to remedy this is to "Use/Project" the sketch to a fresh sketch. You may find you can extrude that as a closed boundary.
If this does not work, you will need to zoom in very deeply at each endpoint looking for gaps.
I got it to work by individually going through each point and re-snapping them to the adjacent end point, then it created a solid.
The other work around was simply "useing" the imported sketch as tracing paper and drew / mirrored new geometry over it using the same endpoints. crude but also worked for this simple geo.
I'm having a very similar sounding issue when importing a DXF into sketchs. I tried going through the whole sketch and making points/lines coincident throughout, but after reviewing it for a long while and still not getting a closed surface I'm hoping one of you might be able to help:
https://cad.onshape.com/documents/d0922bc48473672d2afc50ff
Source DXF is at
http://www.budind.com/dxf/hbext9165.dxf