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Boolean operation failure

michael_fullermichael_fuller Member Posts: 23
How on earth does this simple extrude result in a Boolean operation failure?  It's as though it's only offsetting the plane, not actually extruding.  Not asking it to do anything fancy, just simply extrude the face of the open cylinder another 20 mm.  Now it will allow me to execute the operation if I extrude as "New".  But I don't see any reason why this would fail, this isn't creating any zero thickness geometry as the starting plane isn't the face of the open cylinder but one that's offset rearwards, thus allowing for some unnecessary overlap.  But regardless of the plane (I tried the face of the open cylinder first), Onshape isn't allowing me to extrude an open cylinder tonight (also experimented with a closed cylinder as well, even though this isn't the geometry I'm after, and same failure).  Rough Onshape night.

Best Answer

  • michael_fullermichael_fuller Posts: 23
    edited May 2016 Accepted Answer
    Figured it out.  The extrude was going to create a zero thickness where the cylinder just touched the channel that you can see cleared out ahead of the cylinder in the image above.  Reduced the depth of the channel by .1 mm and problem went away.  Onshape needs a way to highlight specific problem areas.  Only came across this through trial and error.

Answers

  • _Ðave__Ðave_ Member, Developers Posts: 712 ✭✭✭✭
    Not sure without a link try deselecting merge with all and select to merge with the circular housing only. 
  • michael_fullermichael_fuller Member Posts: 23
    edited September 2016
    How do I provide a link?  Deselecting Merge With All hasn't changed anything.  Really weird, just offsetting the plane and no extrusion going on.
  • michael_fullermichael_fuller Member Posts: 23
    edited May 2016 Accepted Answer
    Figured it out.  The extrude was going to create a zero thickness where the cylinder just touched the channel that you can see cleared out ahead of the cylinder in the image above.  Reduced the depth of the channel by .1 mm and problem went away.  Onshape needs a way to highlight specific problem areas.  Only came across this through trial and error.
  • _Ðave__Ðave_ Member, Developers Posts: 712 ✭✭✭✭
    edited May 2016
    You could just copy and paste the address from the browser into the forum. or use the link icon just above the body of your forum message.
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,045
    You will get an error message about not being able to return a valid part. This is usually when you get a zero thickness edge and since it's zero thickness there's nothing to highlight. You also have to consider that this, as one part, would be impossible to manufacture  ;)
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
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