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XOptimising Measurement Cycle Times Using the Hp-O Hybrid Optical Sensor
A Flexible Solution
The HP-O Hybrid optical sensor enables gear rack manufacturers to choose technology best suited to the application. Optical sensors offer speed and accuracy, while tactile sensors can access difficult-to-reach features. The tooth and flank profiles, for example, are captured using the tactile sensor in VHSS mode, whereas tactile metrology is very time-consuming and less detailed when capturing pitch points, making the optical sensor ideal.
The HP-O Hybrid allows instant switches from tactile to optical measurement within the measuring program. An interferometric distance sensor with a resolution of 0.003 microns and a Ø0.011mm spot, it can measure shiny surfaces and is insensitive to changes in ambient light, optimal for capturing high-density data in a production environment.
The optical sensor is used to capture the axial profile by a single-axis move along the complete length of the rack. The pitch points are extracted from the scan. Compared to one point per second using tactile, the optical system can capture up to 1 000 points per second, eliminating pitch measurement, the time-consuming part of the process.
To fully utilise the potential of the HP-O Hybrid sensor, a CMM with appropriate accuracy and dynamics is required. The optical sensor can be used in single-point mode or continuous scanning mode. Unlike the tactile solution, only the surface points inside the focus range of the sensor are captured. Part features can be programmed and captured quickly, minimising the cycle time.
The combination of a Leitz Reference HP CMM, HP-O Hybrid sensor and VHSS technologies with QUINDOS metrology software paves the way to more precise metrology, that can keep in sync with production when used in conjunction with multi-position fixturing, pallet loaders and automation systems.
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The HP-O sensor solution is a scanning technology for coordinate measuring machines (CMMs) and is based on frequency-modulated interferometric optical distance measurement.
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