Fusion 360 for Makers, 2nd Edition

Driving vs. Driven Dimensions

The dimension line drawn in Figure

T

is a driving dimension — that is, it

drives the size of the model.

Adding a lot of dimension lines to a sketch will overly constrain it, making

some of those dimension lines driven, or reference lines. A driven dimension

tells you how long the line is, but it can’t be edited. You have to edit the line

itself to change it. Note that if the sketch is unconstrained, changing the

dimensions will change the shape (Figure

U

). A shape changes when a

driving dimension tells it to change.

The Create Sketch Tools

We’ve used the Two-Point rectangle tool so far. Let’s see how some other

Sk