I've created a sketch on a plane in an assembly.
After copying the sketch, it won't paste into a new part file, to create the new part.
Is there another way?
Did you pre-select a plane in the Part when you tried to paste the sketch? If yes, and it still didn't work, assuming you want the sketch in the same place in the Part you can start a new Part sketch on a parallel plane and use the "Convert Entities" sketch tool to convert the Assembly sketch entities to the Part sketch. Keep in mind that if you use this method you shouldn't delete the Assembly sketch unless you first break the external relations.
Using a Sketch or Sketches to drive linked parts in an Assembly can be a disaster waiting to happen. The way I understand that SW rebuilds the feature tree is from the top down, and normally if you add a sketch in an assembly, the sketch is at the bottom of the feature tree, so the rebuild process starts at part A and goes to (however many parts in the feature tree), then it gets to the sketches at the bottom of the feature tree and if any of those sketches would have changed then you would need to rebuild again to make sure those changes are updated in the other part files.. This method that you're using can create Circular Rebuild Issues really quickly.
Search the forum for SSP....
Try to use the sequence:
1. On assembly level: Insert Component-> New Part -> select Plane (later will be used for sketch)
2. Now you are in edit mode of Sketch1 of a New Part.
3. Click on Sketch you need to copy -> drop down menu -> Copy
4. Still in Sketch Edit mode: drop down menu -> Paste
Exactly what I ended up doing.
I was just looking for shortcut.
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