Measurement device for machining center

A method of machining a workpiece in a CNC machining center, the method comprising:

• coupling a cutting tool to a spindle, the cutting tool having a tool mount;
• engaging the cutting tool to the workpiece to form a feature;
• moving a non-contact three-dimensional (3D) scanner over the workpiece, the 3D scanner operably coupled to the machining center;
• in a first instance:
• determining with the 3D scanner first workpiece 3D coordinates of first workpiece points on the workpiece, the first workpiece 3D coordinates being in a scanner frame of reference tied to the 3D scanner, the 3D scanner including a projector, a scanner camera, and a target in a fixed geometric relationship, there being a scanner baseline distance between the projector and the scanner camera, the determining based at least in part on a pattern of emitted light sent from the projector onto the workpiece, on an first scanner image of the pattern of emitted light on the workpiece, and on the scanner baseline distance;
• determining in a system frame of reference first target 3D coordinates of the target with a first photogrammetry camera and a second photogrammetry camera, there being a photogrammetry baseline distance between the first photogrammetry camera and the second photogrammetry camera, the determining based at least in part on a first image of the first photogrammetry camera, a second image of the second photogrammetry camera, and the photogrammetry baseline distance;
• in a second instance:
• determining with the 3D scanner second workpiece 3D coordinates of second workpiece points on the workpiece, the second workpiece 3D coordinates being in the scanner frame of reference, the determining based at least in part on the pattern of emitted light sent from the projector onto the workpiece, on a second scanner image of the pattern of emitted light on the workpiece, and on the scanner baseline distance;
• determining in the system frame of reference second target 3D coordinates of the target with the first photogrammetry camera and the second photogrammetry camera, the determining based at least in part on a third image of the first photogrammetry camera, a fourth image of the second photogrammetry camera, and the photogrammetry baseline distance;
• and
• determining 3D coordinates of the first workpiece points and the second workpiece points in the system frame of reference based at least in part on the first workpiece 3D coordinates, the second workpiece 3D coordinates, the first target 3D coordinates, and the second target 3D coordinates.