14-476-6 SPI Digital Positioning IndicatorDigital Alignment & Positioning Indicator Advanced concept in finding zero, the true starting point of all 3 axes (X Y Z) on workpieces. Probe actually gets deflected in any of the 3 axes until indicator reaches centerline. At this point the workface (edge) is in direct line with the spindle. Radial run out compensation. With the 3D tester centered in a tool holder, the workpiece edge can be positively picked up in one approach. No guessing as with