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Portable Surface Roughness Measurement for Large Parts

March 14, 2011
Starrets SR100 Surface Roughness Tester, is the first in a new line of material testers
The SR100 has a gauge range of 0.008 in. and an accuracy of 5% of reading plus 4µin.

The SR100 from L.S. STARRETT COMPANY is a portable device for determining surface roughness of large components, structures, and an effective tool for auditing batch production prior to shipment and production line process control. The L.S. Starrett Co. manufactures precision tools and metrology equipment and other tools, and the SR100 is the first in its new line of state-of-the-art material testers.

Weighing just 7 oz., the easy-to-use SR100 features a gauge range of 0.008 in. and an accuracy of 5% of reading plus 4µin. The unit separates into two pieces to measure surface roughness. Using a wide base to ensure stability, the bottom half of the unit travels across the measurement surface and sends an electrical signal to the SR100's upper half. The SR100's hand-held upper has a large LCD display and controls. It digitizes the signal from sensor unit and sends it to a microprocessor where it calculates the parameters using standardized algorithms.

"The SR100 uses an infra-red (IrDA) link between the upper and lower units to provide remote, cable free operation up to a distance of one meter," stated John Richardson, Starrett precision tool product manager. "In addition to measuring basic roughness parameters Ra and Rz, the SR100 also measures advanced Rp, Rv and Rt parameters. It is easy to use, right out of the box and requires little or no operator training."

Other features include a five second cycle time, switch between inch and metric mode without re-measuring, and automatic shut-off after five minutes. The SR100 is user friendly with initial configuration set to minimize problems of use by multiple operators and a simple, reliable calibration routine. The complete SR100 package includes the two-piece assembly, calibration standard, batteries, operation guide and a carrying case.

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