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Hyderabad, India

Gebhardt M.,ETH Zurich | Schneeberger A.,ETH Zurich | Weikert S.,Inspire Technology | Knapp W.,ETH Zurich | Wegener K.,ETH Zurich
International Journal of Automation Technology | Year: 2014

This paper presents the results of detailed thermal analysis of a 5-axis machine tool with focus on the rotary axes. The rotary axes are characterized regarding their position and orientation errors as a function of the underlying thermal load, contributing significantly to the overall accuracy. A physical model is presented, which allows the simulation of the thermal behavior of the rotary axes based on the power input to the drives of the rotary axes and the heat conduction in a swiveling rotary table unit and convection into environment. This enables an external online-compensation of thermal errors. The compensation model is verified and validated.

Transchel R.,ETH Zurich | Leinenbach C.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Wegener K.,ETH Zurich | Wegener K.,Inspire Technology
CIRP Annals - Manufacturing Technology | Year: 2014

Investigations on the cutting behaviour of hexa-octahedron diamonds outlined an enormous influence of the grains' clearance angle on the material removal process. Small negative clearance angles lead to increased specific cutting forces, decreased cutting force ratios and micro-structural changes. This is caused by additional ploughing of the material. This paper presents a kinematic-phenomenological model predicting the specific forces that are caused by the ploughed material. Therefore, the theoretical value of the specific ploughed volume is introduced as characteristic parameter. Results are subsequently compared for different grain cutting situations to experimental data allowing a validation of the proposed model. © 2014 CIRP.

Wegener K.,ETH Zurich | Weikert S.,Inspire Technology | Weikert S.,ETH Zurich | Mayr J.,ETH Zurich
International Journal of Automation Technology | Year: 2016

This paper firstly gives an introduction to the development of machining accuracy, and the contemporarily feasible compensations in the field of machine tools. The metrological means used for primarily static and kinematic compensations are discussed. Furthermore the focus is laid on the kinematic, dynamic and thermal compensation approaches, using various examples for these fields. The different phenomena to be compensated and the associated models are discussed in detail. As conclusions to be drawn, the repeatability of the systems, the ability of the models used in the CNC to represent the systematic behavior and the capabilities of the CNC can be seen as significant prerequisite for a successful application of compensation means. © 2016, Fuji Technology Press. All rights reseved.

Yin K.Y.,Sultan Idris University of Education | Fitzgerald R.,Inspire Technology
International Journal of Mobile Learning and Organisation | Year: 2015

This study examines the effects of mobile learning on distance learners' interest. A mixed method explanatory design with descriptive quantitative method and a follow-up interview were employed in this study. A new 4A model is introduced in this paper based on Adult Learning Theory and Vygotsky's Zone of Proximal Development. A total of 152 distance learners from Malaysia participated in this study. The results revealed significant results on distance learners' interest. The majority of the respondents agreed that mobile learning assisted them in their learning activities. The findings of the interviews also showed positive results. Overall, these findings support the positive effect on mobile learning for distance learners. Copyright © 2015 Inderscience Enterprises Ltd.

Inspire Technology | Date: 2013-10-31

Marketing and commerce engine computer software for use in calculating and measuring quantified data with live social media data to understand real-time consumer demand for vendors, retailers, producers, manufacturers and service providers for making better business decisions.

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