INA at the EMO exhibition presents his new absolute system of angular measurement precision rotary shafts
Schaeffler It has developed an inductive system of angular measurement that is integrated into the bearing and complies with the requirements of the rotary axes with direct drive and high dynamics of machine tools. The principle of integration of the measurement system SRM in bearings for rotary tables, which has been implemented successfully in the YRTM series, has been improved even more. SRM measurement system combines high speed and precision of the measurement with a reduced construction volume and robust design. The system is insensitive to contamination, offers a rotating shaft with open Center and is a compelling solution due to the lesser work of alignment that requires. It is a compelling alternative to optical angular measurement systems. The new series YRTSMA INA bearings are available with diameters from 200 to 460 mm hole They are, from the mechanical point of view, to the bearings for speeds of YRTS series.
The new series YRTSMA INA includes an absolute measurement system. Immediately after connecting the machine, you can consult the absolute angle, which contrasts with the incremental measuring system which a reference run must be after commissioning the machine to know the absolute position. It is essential to know the absolute position when there is risk of collision, for example between the tool and the workpiece during the reference. This system is typically used on milling machines.
The dimensional scale of the new series YRTSMA is located in the same inner ring. A second measuring head, thanks to the excellent radial eccentricity of a dimensional scale that is manufactured in a quality of high-precision bearings are not required. If you use a single measuring head, constructive space is reduced considerably without affecting the performance of the system. This solution is still less sensitive to greases for bearings and usual contamination of the turntables through the inductive principle comparable to a transformer. Free space in the center of the shaft is available for other mechanical components. The electronic evaluation system has been integrated in the measuring head, so that this system can be connected directly to the control unit. The measuring head is clogged and protected attached construction and is designed to be screwed into the bearing, so that always keeps the correct distance from the dimensional scale without the need for a reset. The measuring head is easily accessible from the outside, which simplifies the same change without requiring additional configuration.
With the series YRTSMA, Schaeffler offers an absolute system of angular measurement with open Center for high-precision machine tool rotary tables. The direct integration of the system in the turntable brings economic advantages and a degree of precision high without having to install additional components or alignment work.
