Sizing gears imported as .dxf files

Harry,
This project is just Gearify gears, but they will be carved on an Easel driven X-Carve machine.

This is my plan: After I design my first gear pair in Gearify, I import them into Easel and they are tiny (each is less than an inch in diameter). How to I scale them up to, say, approximately 8 inches in diameter, so that the next pair I produce (the first gear of the second pair being able to mesh with the second gear of the first pair) is at the same “scale” as the first pair?

Does this make sense?

In a world of scalable vector graphics, how does one set a scale for a project so that everything is designed/built to that same scale? A very noob question, I know, but…