Design for Industry Rotary index table improves portable arm metrology

LK Metrology’s new Freedom Index Table aims to increase component inspection speed when using portable, multi-axis measuring arms. The table’s portability can increase e ciency and, in some cases, e ective measuring volume by using smaller, less expensive arms to access all component areas.

Static tables require operators to relocate the arm to access the back of a part, which can lengthen the measuring cycle and introduce inaccuracies. However, the ergonomic rotary index table enables su cient access and prevents operator fatigue from repeatedly reaching around the component, which can weigh up to 220 lb (100 kg).

Requiring no cables, the portable, manually operated, metrology-grade index table is compatible with any portable measuring arm, including LK’s six- and seven-axis Freedom Arm models. Operators can quickly set up the 11.8 in. (300 mm) or optional 19.6 in. (500 mm) diameter table on a work surface and secure a component with the pre-drilled, threaded fixing holes or integral clamping magnets.

Initial calibration of the start position is also quickly performed by inputting the table’s location in InnovMetric’s PolyWorks Inspector software. Randomly placed, alphanumerically labeled, fiducial dimples are machined into the top of the table and around its periphery. When the measuring arm probes three or more reference dimples, the software recognizes the irregular pattern and automatically detects the orientation. Operators then select the software’s on-screen Freedom Index Table macro to update the coordinate system and continue the part inspection.

When operators need to access the far side of the part, the table rotates 180° (or any intermediate angle), and the arm probes three or more reference dimples to update the software with the new position and continues measuring. The software automatically aligns both sets of inspection data. The PolyWorks 3D dimensional analysis and quality control software also performs geometrical feature measurements, surface evaluation using advanced point cloud analysis, part-to-CAD comparison, and complete reporting. DW