Latest from Testing/QC

Kawasaki Robotics Inc. and Olis Robotics
Thermo Scientific
Thermo Scientific™ ARL iSpark™ Plus optical emission spectrometer.
Brass Knuckle Safety Products
Brass Knuckle Read is cost-effective and lightweight bifocal eye protection that fits well and is available in five diopter strengths.
Mahr Federal Inc.
The probe arms of the LD 130 and 260 have shapes that mimic those found in nature By using these new shapes Mahr Federal designers reduced the probe weight by as much as 50 while maintaining the same rigidity and thereby dramatically improving dynamic response

Metrology System Combines Roughness, Surface Measurement

Sept. 9, 2012
Longest drive, fastest positioning and measuring speed Biomimetic probe arm design with magnetic mounting, automatic probe recognition

MAHR FEDERAL INC. builds on the success of its MarSurf® LD 120 system for combined surface and contour measurements with a new generation of instruments. Together the new LD 130 and 260 feature longer travel — reportedly the longest in the industry for the LD 260 — the fastest positioning and measuring speeds in the industry, a biomimetic probe arm design with magnetic mounting, and automatic probe recognition, dynamic measuring force, low residual noise, and numerous other improvements.

"Simply put," explained Pat Nugent, Mahr Federal's v.p. of Metrology Systems, "our intent with the design of the LD 130 and 260 was to take the success of the MarSurf LD 120 platform and improve on it in any way we could. "One interesting example is the new probe arm designs, which are biomimetic, meaning their shapes mimic those found in nature. By using these new shapes we've been able to reduce probe weight by as much as 50% while maintaining the same rigidity, and thereby dramatically improving dynamic response."

The MarSurf LD 130 and 260 units feature travel lengths of 130 mm and 260 mm respectively. This not only allows measurement of much larger parts, but with travel speeds up to 200 mm/sec and measuring speeds up to 10 mm/sec (depending on the surface) measuring cycle times can be significantly reduced — as much as 50% in the case of a 260-mm steering shaft with gear tooth measurements at each end.

Improved dynamic response of the probe also helps increase measurement speeds and reduce measurement cycle time by allowing the probe to track the part surface better. In addition, dynamic measurement force allows the drive units to operate at angles of ±45° from horizontal, dramatically increasing the flexibility of the MarSurf LD 130 and 260 systems.

Both units have been redesigned to improve both safety and accessibility. The tip of the newly designed biomimetic probes is now below the lowest point on the housing, allowing improved access in more measuring applications. In addition, while the LD 130 and 260 retain the magnetic breakaway probe feature of the early LD 120 system, the entire lower housings on the new units are pressure sensitive so that in the event of unintended contact with another object an emergency signal is initiated and stops all movement of the drive unit.

Automatic probe recognition has also been improved. While RFID signals used on competing systems can cause confusion if two or more probes are in signal range, Mahr's automatic recognition system is measuring program specific and requires operator confirmation. Thus, the proximity of other probes is not an issue, and should another probe be mounted while an operator is on break, for example, he will be notified before resuming his measurement program.

Finally, the residual noise signal in the new MarSurf LD 130 and LD 260 units has been significantly reduced. This is the roughness "error" that would still be recorded if the probe traced a perfectly flat surface. In the MarSurf LD 120, this was specified at between 34 and 40 nm Rz. In the new units, this has been reduced by nearly 50% to 20 nm Rz. This is a significant improvement for those making ultra-high precision surface and contour measurements.

The MarSurf LD 130 and 260 systems for combined surface and contour measurement are available in a number of different configurations and with a wide range of probe design tips and other accessories.


About the Author

Robert Brooks | Content Director

Robert Brooks has been a business-to-business reporter, writer, editor, and columnist for more than 20 years, specializing in the primary metal and basic manufacturing industries. His work has covered a wide range of topics, including process technology, resource development, material selection, product design, workforce development, and industrial market strategies, among others. Currently, he specializes in subjects related to metal component and product design, development, and manufacturing — including castings, forgings, machined parts, and fabrications.

Brooks is a graduate of Kenyon College (B.A. English, Political Science) and Emory University (M.A. English.)