Schmitt Offers Surface Roughness Measurement Units

Schmitt Europe has launched the Lasercheck range of surface roughness measurement gauges, designed to perform high-speed, accurate and non-contact measurements on a variety of machined parts. Lasercheck is said to work on any material, including metals, ceramics, glass and rubber, and is suited to ground, sanded, polished, honed, super-finished, fine-tuned, and shot-blasted surface finishes.

The surface roughness measurement gauges are specifically designed for portable or on-line use in production and manufacturing environments. Light scatter detection technology is said to provide superior durability, measurement speed (less than one second) and repeatability without high maintenance and recalibration costs. Operation on the production floor can use Lasercheck to easily and quickly monitor surface finish quality without concern for damaging other fragile measurement equipment or surfaces.

Lasercheck surface roughness measurement heads have no moving parts, are claimed to be virtually indestructible and are ideally suited for high-volume QC work. The principle of operation is simple in that a built-in visible laser diode emits a laser beam from the bottom of the gauge, illuminating the surface beneath it. After striking the surface, the laser light is reflected and scattered back into the Lasercheck detection system. The overall intensity and distribution of the reflected and scattered light is measured, digitised by the Lasercheck controller electronics and the surface roughness (Ra) calculated for the illuminated area.

This Ra value is then displayed on the LCD control unit screen. Measurements can be performed by manual pushbutton operation, or continuous high-speed measurements controlled by Windows software, or fully automated high-speed on-line measurements triggered by external signals and Windows software, displaying real-time Ra values in graphical and numeric format with statistical parameters. Lasercheck has been designed for a nominal height standoff of 2.5cm from the measurement surface, in which any motion or vibration is continuously monitored and corrected for during every measurement cycle to ensure accurate results.

The Lasercheck Micro 8826 head measures 2.5 x 1.9 x 5.1cm with a surface roughness measurement range of 0.025 to 2.0 mm and the Lasercheck Mini 6212 head measures 7.5 x 3.5 x 4.4cm with a surface roughness measurement range of 0.0125 to 2.0mm. Three controllers are available. The automated A Controller is a standalone unit capable of 10 measurements per second, the portable B Controller a handheld unit capable of storing up to 10,000 Ra values and an OEM card C Controller for mounting in the customer's own electronics panel.

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