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SPRINT™ technology

Designed to operate reliably, even in the harshest machine tool environments.

Completely new technology for high‑value machining.

Designed in collaboration with major controller manufacturers.

Built on over 30 years of on‑machine probing experience.

Explore the SPRINT technology

SPRINT technology overview with orange text  

SPRINT technology overview 

Robustness

The SPRINT system brings game-changing new capability to machine tool processes but without compromising robustness. This is because, as with all of Renishaw's machine tool products, the SPRINT system is designed to operate reliably in even the harshest of machine tool environments.

Constructed from the highest quality materials, the OSP60 SPRINT probe has been rigorously tested to ensure that it can withstand shocks, vibrations, impacts and extremes of temperature, far in excess of those typically seen in machine tools. It is also fitted with an overtravel mechanism to bring it safely to a halt should it collide with a part or clamp. Each OSP60 probe is fully tested to ensure that it can scan accurately whilst in full flood coolant conditions.

True 3D data

The SPRINT system, with its true 3D scanning capability, allows complex part measurements to be performed with extremely high accuracy at breathtaking speeds, offering new applications with game-changing capabilities.

To take full advantage of this potential, it is essential that the SPRINT OSP60 probe tracks the exact position of its stylus tip, whatever the nature of the surface being scanned or the orientation of the probe relative to that surface. In order to achieve this, a step-change in probing technology was required, resulting in the development of an all-new, patented, high-resolution 3D capacitive transducer system.

More than 250,000 full 3D readings from the capacitive transducer are collected and oversampled every second, allowing the system to provide an effectively continuous output of the probe's instantaneous deflection to a resolution of better than 0.1 μm. This data can then be transmitted by the OSP60 probe on demand, at a rate of up to 1,000 true 3D data points per second, even whilst scanning at incredible speeds of up to 15,000 mm/minute.

Advanced calculations

Using the Productivity+™ CNC plug-in software, the SPRINT system delivers enhanced feature definition and measurement accuracy that can be seamlessly integrated into automated process control applications.

Through close integration of CNC plug-in software with the machine tool controller, advanced data fitting and analysis algorithms can be employed to calculate the measured positions, sizes and forms of prismatic features using the thousands of data points acquired during feature measurements. The result is a step-change in measurement performance, whilst still providing measured results in a format that can be used by the machine tool controller to perform in-process control applications, such as adjusting cutter length, diameter compensations and updating work co-ordinates.

Differential calibration

In order to deliver accurate measurement results, all scanning probes must be calibrated over the active volume of their 3D deflection range. Unfortunately, on machine tools, uncertainties can be caused by static and dynamic volumetric errors, and transient thermal effects, all of which would significantly degrade measurement accuracy should traditional calibration methods be used. However, such systematic and transient errors have a negligible effect on the short-term localised repeatability of machine tools. The patented differential calibration method used for the SPRINT OSP60 probe takes advantage of this characteristic, minimising errors by relying on localised machine repeatability rather than absolute accuracy.

Differential calibration measures the differences in the OSP60 probe's response between very similar machine moves. By using a number of similar moves, each offset by a small amount, a complete set of calibration parameters can be calculated. This allows calibration to take place in any part of the machine volume without incorporating systematic or transient accuracy errors into subsequent measurements. The OSP60 probe's calibration is therefore independent of machine errors, even allowing the SPRINT system to be used as a diagnostic tool to detect them.

Responsiveness

To achieve highly accurate measurements it is vital that the probe's stylus tip precisely follows the surface of the part that is being measured.

The OSP60 SPRINT probe has a patented sensor mechanism that has been specifically designed for high-speed scanning. This sensor responds rapidly to the surface undulations of the part, even on free-form parts and tightly curved surfaces. This allows the probe's stylus tip to maintain continuous contact with the surface of the part, even when scanning at speeds as high as 15,000 mm/minute.

Customers can therefore rely on the OSP60 probe to deliver extremely accurate measurement data, regardless of the surface being measured or the speed at which the probe is travelling.

Machine position data integration

In order to provide an accurate description of a scanned surface, it is important to synchronise the collection of probe deflection data with the recording of true machine position. This allows the exact location of the stylus tip to be determined, regardless of the machine's path following strategies and acceleration profiles.

Using its close working relationships with leading machine tool controller manufacturers, Renishaw has developed a unique and patented integrated architecture that ensures the SPRINT system has real-time access to true machine position data during measurement operations. Productivity+™ CNC plug-in software then combines the probe deflection data with the synchronised true machine position data using unique algorithms. The result is that the customer can have absolute confidence in the surface measurement of the part, even for high-speed, free-form scanning, leading to higher accuracy machining processes and part verification capability.

Optical transmission

The OSP60 SPRINT probe is capable of providing up to 1,000 3D probe deflection data points every second. It also continuously records information on battery condition, ambient temperature and overtravel status. In order to ensure measurement accuracy, system responsiveness and safety, it is vital that this data be transmitted rapidly and reliably to the OMM-S SPRINT receiver, then onwards to the OSI-S SPRINT interface.

In order to do this Renishaw has designed a dedicated high-speed optical transmission system with a robust, bidirectional data link. This unique transmission system is particularly resistant to noise in the infrared spectrum, operating at modulation frequencies well above those produced by conventional machine tool light sources, and employing in-built error checking to ensure data integrity.

SPRINT™ literature

SPRINT™ images