Schaeffler introduces New integrated bearing and angular measuring system for machine tool rotary axes
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Sep 05,2014
Precision bearing manufacturer Schaeffler has developed an angular measuring system suitable for direct-driven, highly dynamic, high precision rotary axes in machine tools. The system incorporates an inductive (absolute) angular measuring system integrated in a rotary table bearing.
The principle of integrating the SRM measuring system into a rotary table bearing was successfully implemented in Schaeffler’s YRTM range of bearings, but has now been developed further. The SRM measuring system combines high measuring speed and measurement accuracy with a reduced design envelope and increased robustness. The system is insensitive to contamination (e.g. lubricants and coolants), offers a rotary axis with an open centre (freeing up space in the centre of the machine) and reduces alignment errors. With fewer mechanical components, the system is also easy to replace and maintain.
The new YRTSMA bearings from Schaeffler can be fitted to the rotary axes as an alternative to optical angular measuring systems. YRTSMA bearings are available with bore diameters from 150 mm up to 1030 mm.
High measurement accuracy
By fitting the YRTSMA bearing to the rotary axis, information about the absolute angle is available immediately after switching on the machine. With an incremental measuring system, the absolute position cannot be found until a reference run is carried out after switching on the machine. Knowledge of the absolute position is critical if there is a risk of collision between the tool and the workpiece (e.g. collision of projecting edges) during the reference run. This system is therefore typically used in milling head applications.
The measuring scale of the YRTSMA series is positioned directly on the inner ring. Due to the excellent radial runout of the measuring scale, which is manufactured in high precision bearing steel, a second measuring head is not required. By using only one measuring head, the overall design envelope is significantly reduced, without adversely affecting system performance.
Due to the inductive measuring principle, YRTSMA bearings are even less sensitive to rolling bearing grease and contaminants that are normally present in harsh machine tool rotary table applications. The free space in the centre of the axis can still be used for mounting other machine ancillary components. The electronic evaluation system is integrated into the measuring head so that the system can be connected directly to the machine tool control system. The measuring head is effectively sealed off from the adjacent construction and is designed to be screw mounted to the bearing, which means it is positioned at the correct distance from the measuring scale at all times, without requiring any adjustments. The measuring head is easily accessible and can be replaced without additional setup if required.
For more information on the YRTSMA series of bearings, please call Schaeffler UK’s Marketing Department on 0121 313 5870. Alternatively, email info.uk@schaeffler.com.
(Schaeffler introduces New integrated bearing and angular measuring system for machine tool rotary axes)
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1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
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