Profile projectors are sometimes called shadow-graphs and use a system of lenses and mirrors to project part profiles onto a screen. They are used either to compare projected images of parts to mylar overlays on the screen or alternatively as a way to measure features on parts using a digital readout (DRO) or computer tablet.
Depending on the model the image on the screen can be inverted or upright and the image a mirror image of the part. The work-stage has X and Y-axis movements and an additional axis called the Q axis is facilitated by the rotation of the comparator’s screen.
