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If you are an old Pro E user you will probably click the button then define since this was the workflow up through 2001. A new user will probably create the sketch then use protrusion since many other cad programs do it this way and the change is to make it easier to train people when tranfering cad systems.
You make the sketch separately mostly when you will use the same pattern in several parts. The idea of making it indifferent to select the action then the object or the object then the action is part of evolving towards mode independent creation environments. To each his style and train of thought.
I spoke to technical support at PTC about this issue a while
ago, or more precisely about redefining an internal sketch to be external and
an external sketch to be internal. They said it isn
When using skeleton models, if you create the sketch first
then the feature, you can then directly use the sketch created to define the skeleton
in each individual component.
I've just posted a forum note questioning the benefits of this method, but I
I have a definate preference for internal sketches, particularly for
revolved features. Partly it is just habit as I've been using Pro/E
since forever and you did not have any other option except datum curves
in the past. But the big difference to me is the greatly improved
drawing flexibility with internal sketches. If I have a revolved
feature, there are an infinite number of view orientations where I can
show the dimensions of an internal sketch but only 2 (front & back
of the sketching plane) for an external sketch.
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