To control the height of the cutting tool, in this case a Dremel, the frame pivots up and down and the X-axis rail. A screw driver is mounted off the side of the Dremel that acts as a stylus.
Little jobs require little tools and you can’t get much more littler than a Dremel. For his tiny tasks, [sdudley] has built a Dremel-powered base station that features a table saw, drum sander ...