Scanning System facilitates CMM part inspection.

Press Release Summary:

Offering measurement speeds up to 500 mm/sec, 5-Axis Scanning System integrates Renscan5(TM) 5-axis machine control, REVO(TM) measuring head, laser-corrected probe, and UCC2 universal CMM controller. Featuring spherical air bearing technology, REVO uses synchronized motion when scanning to follow changes in part geometry, without introducing dynamic errors. Two rotary axes are driven by direct-drive brushless motors, giving infinite rotation and infinite positioning capability.

Original Press Release:

Renishaw Creates Next Revolution in CMM Part Inspection with Ultra-High-Speed, 5-Axis Scanning Technologies

Renscan5 motion control software and infinite-positioning REVO measuring head enable part inspection at speeds up to 500 mm/sec for more data points on reduced cycle times

September 2005 - Inventor of touch-trigger probing, Renishaw again revolutionizes part inspection, creating a new system of breakthrough technologies that bring ultra-high-speed scanning to coordinate measuring machines (CMMs). The system integrates advanced 5-axis machine control, named Renscan5(TM), with an ultra-high-speed, infinite-positioning REVO(TM) measuring head, a first-ever laser-corrected probe, and a new UCC2 universal CMM controller.

The Renscan5 enabling technology allows the development of a range of breakthrough five-axis scanning products that measure at speeds up to 500 mm/second (vs. standard practice of 10-20 mm/sec), while virtually eliminating the measurement errors normally associated with existing three-axis scanning systems. The five-axis system achieves this by allowing the smaller REVO measuring head to perform most of the motion during inspection routines, minimizing the dynamic errors caused when moving the larger mass of a CMM structure.

The latest developments will revolutionize measurement throughput by reducing cycle times, while simultaneously providing greater data coverage to meet tighter part specifications, said Renishaw officials. They compare the advance in CMM capabilities with the impact made by Renishaw's invention of touch-trigger probes.

The initial product to take advantage of the new Renscan5(TM) technology, the REVO head is the first in a family of revolutionary measuring head and probe systems that will maximize inspection throughput, while maintaining a high level of system accuracy. REVO uses synchronized motion when scanning to quickly follow changes in part geometry, without introducing its own dynamic errors. This allows the CMM to move at a constant velocity along a constant vector as measurements are being taken, removing the inertial errors that result from acceleration of the machine during conventional 3-axis scanning.

The REVO measuring head features ultra-stiff spherical air bearing technology in each of its two axes, providing a stiff platform for good metrology. The two rotary axes are driven by state-of-the-art direct-drive brushless motors, giving infinite rotation and infinite positioning capability to optimize part access. The axes are linked to 0.08 arc-second high-resolution Renishaw encoders, giving ultra-high positioning accuracy.

A highly innovative "tip sensing" probe mounted to the REVO measuring head further minimizes the errors caused by the dynamic effects of high-speed motion and allows the use of long styli without reducing accuracy. A laser light system is used to accurately measure the exact position of the probe tip, with a beam of light directed from within the probe body down a hollow stylus to a reflector at the stylus tip. Unlike conventional styli that need to be very stiff, the new hollow stylus is designed to bend, thereby deflecting the return path of the laser beam which is received by a Position Sensing Detector (PSD), also mounted in the probe body. Movement of the laser spot on the PSD is translated into a measurement output by combining it with information about the geometry of the measuring head and probe, and each of the CMM axis scale outputs. The exact stylus tip position can therefore be calculated.

This process takes place while the stylus tip is dynamically scanning the part and the measuring head moves synchronously with the CMM. Hollow tube design provides ultra-low moving mass to minimize inertia. With minimal inertial effects, measurement accuracy is maintained even with very long styli (500 mm reach is available).

Renscan5 and REVO are available with the new UCC2 universal CMM controller that forms the foundation for Renishaw's future high-speed scanning systems. The second generation UCC2 controller features patented MoveScan(TM) software that synchronizes and smoothes motion between the CMM and the REVO head. On-the-fly repositioning of head and stylus between part features shortens scanning time of indexing systems.
For more information on Renscan5 and REVO scanning technologies, contact Denis Zayia, CMM products manager, tel: 847-286-9953, email

The revolutionary REVO(TM) five-axis scanning system measures at speeds of up to 500 mm/sec, while using synchronized motion to quickly follow changes in part geometry without introducing its own dynamic errors.

Read inquiries should be directed to:
Susan Wilm
Marketing Assistant
Renishaw Inc.
5277 Trillium Boulevard Hoffman Estates, IL 60192

All Topics