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Extrude Remove Does not do as expected
dana_kelley262
Member Posts: 31 ✭
The below link has the document in question.
The first image below shows the remove Blind failing to remove material through the cylinder wall as show in the next image. I need the material removed through the back wall and also up to the internal face in the opposite direction. Note the same exact extrude is done on the opposite end of the tube and works as expected. Also note it use to work until reordering sketches and extrudes. I'm very new to using OnShade so there may be a subtle issue with a sketch or something else. From my point of view there is a potential bug in the code.
https://cad.onshape.com/documents/d13eaf26a2956ddd451ab160/w/36e3e863a4661531560cfff5/e/92ce7cd97adb501daacea219
The first image below shows the remove Blind failing to remove material through the cylinder wall as show in the next image. I need the material removed through the back wall and also up to the internal face in the opposite direction. Note the same exact extrude is done on the opposite end of the tube and works as expected. Also note it use to work until reordering sketches and extrudes. I'm very new to using OnShade so there may be a subtle issue with a sketch or something else. From my point of view there is a potential bug in the code.
https://cad.onshape.com/documents/d13eaf26a2956ddd451ab160/w/36e3e863a4661531560cfff5/e/92ce7cd97adb501daacea219
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Best Answers
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NeilCooke
Moderator, Onshape Employees Posts: 5,354 
What is a bit weird about that is the blind extrude not cutting out a massive hole in your part. There are several geometric / kernel issues going on here - not an excuse, but a matter of fact - the internal cylinder is a full surface so it may be confused as to what it is extruding up to and the sketch extends past the cylinder silhouette which may also be causing an issue. This is, unfortunately, one of those scenarios where getting the job done in a timely manner is more important than being feature-efficient. Feel free to report it as a bug, but we can only escalate it Parasolid which is somewhat out of our control,Senior Director, Technical Services, EMEAI5 -
NeilCooke
Moderator, Onshape Employees Posts: 5,354
This was the issue, so it's not really a bug. You can't extrude up to a surface if the profile is already intersecting the surface. Having said that, the result of the extrude did not make it obvious. I edited your sketch and "used" the inside diameter and it now works as expected.NeilCooke said:... and the sketch extends past the cylinder silhouette which may also be causing an issue.
https://cad.onshape.com/documents/1189ce5a1a3db5e3f810e6a4/w/dbfe40ad958bfea61fe289c0/e/84c6a577aea004f2127eb328
Senior Director, Technical Services, EMEAI5
Answers
Not sure if this is a bug or expected, but as a work-around, you can split your extrude into two different extrudes. So, just create one extrude that has the blind depth you want. Then create another extrude in the opposite direction that has the "up to face" condition. You can use the same sketch to do both extrudes. It'll just be hidden and you'll need to un-hide it to do the second extrude.
Still looks like a bug revealed by the reordering process.
I'll wait for others to review and might puss it up to potential code bug.
https://cad.onshape.com/documents/1189ce5a1a3db5e3f810e6a4/w/dbfe40ad958bfea61fe289c0/e/84c6a577aea004f2127eb328