SolidWorks Best Practice #1
scslowik August 26th, 2008
How Robust is your SolidWorks model?
Being able to make changes to your model with the confidence that it will update without errors is directly dependent on how you constrain your sketches.
Whenever possible… define constraints, etc. to sketch entities as opposed to feature face edges. Sketch entities are less likely to change or be absorbed in later feature operations than edges. Edges can be absorbed by features like fillets and chamfers making any references to them unsolvable.