Correct order for contraining extrusion geometry?

[HJS]

When I create an extrusion, should I be using labelled dimensions directly onto the sketch lines of the extrusion- or is it best practice to dimension to reference planes / lines first? Does it make any difference? A few time recently when creating families, I have received the "Unable to constrain geometry" error messages. I just wondered if this had anything to do with it?

[Saw]

When I create an extrusion, should I be using labelled dimensions directly onto the sketch lines of the extrusion- or is it best practice to dimension to reference planes / lines first? Does it make any difference? A few time recently when creating families, I have received the "Unable to constrain geometry" error messages. I just wondered if this had anything to do with it?

Personally I would get into the habit of only ever contraining / dimensioning to the referecne planes / lines- and never to the sketch lines of the geometry. That way, you can flex your "skeleton" of referecnme planes and lines long before you start adding the geometry to it. You'll save yourself a lot of time and effort in the long run.

Just my opinion.

Mike