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Drive internal setpoint calculation for fast axes

: Lindemann, D.; Brecher, C.; Wenzel, C.

American Society for Precision Engineering -ASPE-; Asian Society for Precision Engineering and Nanotechnology -ASPEN-:
Manufacture and metrology of freeform and off-axis asphric surfaces. ASPE/ASPEN summer topical meeting 2014. Proceedings : June 26 - 27, 2014, The Fairmont Orchid, Kohala Coast, Hawaii, USA
Raleigh, NC: ASPE, 2014
ISBN: 978-1-887706-65-0
Summer Topical Meeting "Manufacture and Metrology of Freeform and Off-Axis Aspheric Surfaces" <2014, Kohala Coast/Hawaii>
Conference Paper
Fraunhofer IPT ()

Optics for high-tech applications currently combine freeform surfaces and microstructures and have a demand for a certain orientation of the structure to reference marks for mounting. State-of-the-art Slow Tool and Fast Tool methods both have drawbacks that either limit the achievable process dynamics or the desired accuracy. At Fraunhofer IPT a novel control method has been developed implementing a drive internal setpoint calculation strategy for fast axes. The new approach uses parts of the original geometry description to calculate surface-based setpoints within the fast servo loop of the motion controller at 10 kHz. With this method, a closed and continuous interpolation of all axes (X, Z, C) is realized (one advantage of Slow Tool methods). On the other hand, the evaluation of the actual workpiece position and the calculation of setpoints for the tool axis on this basis can be executed a shorter cycle times like in Fast Tool systems. Combining the advantages of both methods, a very low latency setpoint generator can be implemented guaranteeing ultra-precise and highly dynamic tool movements. Future work will focus on further machining tests and measurements of the achievable accuracy.