Product category:
Coordinate measuring machines (CMM) and software
News Release from: Renishaw | Subject: Renscan5 and REVO 5-axis scanning for CMMs
Edited by the Manufacturingtalk Editorial
Team on 17 June 2005
Five-axis CMM scanning probe head is
ultra-fast
Revolutionary five-axis scanning technology allows highly accurate, ultra high speed five-axis scanning measurement of component surfaces on CMMs at up to 500mm/s.
Renishaw is claiming the most significant advances in co-ordinate measuring machine (CMM) technology for 20 years with the recent introduction of revolutionary five-axis scanning techniques Renscan5, a new enabling technology that will allow highly accurate, ultra high speed five-axis scanning measurement on CMMs, and REVO, the first in a family of revolutionary measuring head and probe systems, will redefine the industry standard for scanning systems
This article was originally published on Manufacturingtalk on 13 Jun 2008 at 8.00am (UK)
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The introduction of Renscan5 technology allows the development of a range of breakthrough five-axis scanning products that will measure at speeds of up to 500mm/second, and virtually eliminate many of the measurement errors normally associated with existing three-axis scanning systems.
A five-axis system achieves this by allowing the lighter measuring head to perform most of the motion during inspection routines, minimising the dynamic errors caused when moving the larger mass of a CMM's structure.
Renscan5 will be available with Renishaw's new UCC2 universal CMM controller that forms the foundation for Renishaw's future high speed scanning systems.
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The first product to take advantage of the new Renscan5 technology, is REVO, which will maximise inspection throughput whilst maintaining a high level of system accuracy.
REVO uses synchronised 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 vector whilst measurements are being taken, removing the inertial errors that result from acceleration of the machine during conventional 3-axis feature scanning.
The REVO measuring head features ultra stiff spherical air bearing technology in each of its two axes, providing a stiff metrology platform.
The two axes are driven by state-of-the-art brushless motors that are linked to 0.08 arc-second high-resolution encoders, giving fast ultra high positioning accuracy.
A key benefit of this technology is easier access to features to be measured, due to infinite rotation and infinite positioning capability.
A highly innovative probe mounted to the REVO measuring head further minimises 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 monitored 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 whilst the stylus tip is dynamically scanning the part and the measuring head moves synchronously with the CMM.
With no inertial effects on the laser beam, measurement accuracy is maintained at high speeds.
Renscan5 and REVO technologies represent such a significant advance in the capabilities of CMMs, that they are already being compared with the impact made on the CMM market by Renishaw's original touch-trigger probe and motorised probe heads.
They will revolutionise measurement throughput by reducing cycle times, whilst simultaneously providing greater data coverage to meet tighter part specifications. Request a free brochure from Renishaw ...
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