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Get more from your CMM
Most CMM structures are not subject to high levels of wear and so remain serviceable for many years. What’s more, because you are re-using the costly superstructure of the machine, an upgrade is a fraction of the price of a comparable new machine. A measurement revolution
The operational benefits this brings are as follows:
Breaking the dynamic performance barrierThe first generation of computer-controlled CMMs were developed to suit touch-trigger probing, in which discrete points are acquired at key locations on the component. The measurement process involves driving the probe’s stylus onto the surface of the part at a constant speed, so the CMM’s structure is not accelerating when a measurement is taken. This means that machines did not need to be particularly stiff to measure accurately.
These inertial forces twist and deflect the machine structure, resulting in measurement errors that can quickly become larger than the measurement tolerance (see below). Sadly, the laws of physics dictate that, when measuring holes, the inertial forces increase with the square of the measurement speed, so going faster becomes increasingly difficult, despite the best efforts of machine designers.
The low speed plot (red) shows little form error, whilst the high speed plot (blue) shows a rising error as the radial acceleration builds up as the machine attains the programmed scanning speed. The feature appears too small due to outward radial deflection of the CMM structure as it undergoes inertial forces whilst following the circular contour. Furthermore, the form of the feature is badly distorted. Even the fastest modern machines are limited to scanning speeds in the region of 80 to 150 mm/sec, depending on the nature of the feature being measured. But practical concerns about accuracy (illustrated above) mean that most scanning in production applications is done in the 10 to 25 mm/sec range. 5-axis scanning breaks through this barrier by avoiding the problem of machine dynamic errors. Instead, the innovative REVO® scanning head is able to acquire surface data whilst moving its two rotary axes at up to three revolutions per second, enabling scanning speeds of up to 500 mm/sec, far beyond the capability of even the fastest CMMs. The apparently insurmountable problem of dynamic errors is alleviated by not asking the machine to accelerate during measurement, or at least minimising such acceleration where it cannot be avoided altogether. This is achieved by using 5 axes of simultaneous motion, with the bulk of the workload of moving the stylus tip falling to the REVO head. Examples of these new techniques are illustrated below:
Controlling factorThe motion controller is a vital factor governing the performance of any CMM. An outdated controller can limit the range of measurements that can be taken, and may eventually become unsupported and unreliable. In short, it can cripple a perfectly good CMM frame, or at least limit its ability to meet your changing needs.
The UCC controllers are all I++ DME compliant, enabling them to inter-operate with any I++-compliant metrology software. This leaves you free to choose the software that best suits your needs, and even change software to suit different inspection tasks. Improving automation
Flexible, modular sensors and indexing heads can increase measurement flexibility and automation, providing access to all component features in a single set-up. The power of CAD
Modern metrology software is designed to make full use of the power of CAD, enabling rapid off-line programming with nominal and tolerance data coming straight from the model. Reporting is now graphical rather than tabular, making it far easier to interpret measurement data and, more importantly, take appropriate action as a result.
Upgrade and save
Cost-effective upgrades to key elements of your machine – sensors, controller and software – can reveal your CMM’s hidden potential, giving you state-of-the-art performance as well as a future-proof metrology system. One-stop retrofit service
Learn more
A complete CMM upgrade, supplied and supported by Renishaw. Kontaktieren Sie unsBitte kontaktieren Sie uns, wenn Sie weitere Informationen wünschen, eine Preisanfrage haben oder Ihre nationale Renishaw Niederlassung Kontakt zu Ihnen aufnehmen soll. |
Measurement is vital to any manufacturing business, providing essential information to control processes and verify products. But older co-ordinate measuring machines (CMMs) can become bottlenecks if they fail to keep pace with changing measurement needs. Advances in sensor, metrology software and controller technology now offer the opportunity to transform existing CMMs, providing greater accuracy, faster measurement, more automation and new capabilities, whilst taking full advantage of CAD-driven programming. In the current climate, upgrading makes good economic and ecological sense.
Recent revolutions in sensors, controllers and metrology software have transformed the performance of new CMMs. As these advances are not dependent on the CMM frame, they are also available on your old CMM, giving you …
The recent introduction of the 
The arrival of 3-axis scanning drove changes to the design of CMM structures. Scanning involves moving the stylus of the probe across the component, following its surface contours. For instance, measuring a feature such as a hole requires the probe to be moved in a circular path, causing the moving elements of the CMM structure (the bridge and quill) to undergo accelerations whilst the measurement is taking place. These structures are large and heavy, so accelerating them requires significant forces and inevitably results in inertial deflections at the stylus tip that are not seen by the machine’s position encoders which are located, in the case of the Y axis, on the bed of the machine.
This chart illustrates the impact of scanning speed on measurement accuracy. Two scans are taken on a calibrated ring gauge at different speeds. The scans both start at the bottom of the plot and proceed in an anticlockwise direction.
Renishaw’s 
5-axis scanning is best suited to the measurement of complex parts where inspection cycle times are currently long, or where large volumes of components must be measured and throughput is a principal concern. In other instances, upgrading to a 3-axis scanning sensor or to a trigger probe with stylus changing can provide significant productivity and automation improvements at a lower cost.
Software is perhaps the biggest single reason why many CMM users choose to upgrade, as it is the aspect of the CMM that they interact with most often. Slow programming, clunky program execution, unfriendly reporting and outdated operating systems can all lead to frustration and harm productivity.
Renishaw’s new 
In the current challenging economic climate, making the most of your assets makes perfect sense. It is also good for the environment to continue to re-use serviceable elements of your CMM structure such as the bed, bridge and quill, whose manufacture is relatively energy-intensive.
Renishaw’s comprehensive retrofit service includes:
