Corrigendum to “Theoretical and experimental investigation of spindle axial drift and its effect on surface topography in ultra-precision diamond turning” [International Journal of Machine Tools & Manufacture 116 (2017) 107–113]

2017 ◽  
Vol 122 ◽  
pp. 176-178
Author(s):  
Quanhui Wu ◽  
Yazhou Sun ◽  
Wanqun Chen ◽  
Guoda Chen
Keyword(s):  
Experimental Investigation ◽  
Surface Topography ◽  
Machine Tools ◽  
Diamond Turning ◽  
Ultra Precision

scholarly journals Theoretical prediction and experimental verification of the unbalanced magnetic force in air bearing motor spindles

2019 ◽  
Vol 233 (12) ◽  
pp. 2330-2344 ◽  
Author(s):  
Quanhui Wu ◽  
Yazhou Sun ◽  
Wanqun Chen ◽  
Qing Wang ◽  
Guoda Chen
Keyword(s):  
Surface Topography ◽  
Surface Quality ◽  
Magnetic Force ◽  
Research Work ◽  
Diamond Turning ◽  
Surface Generation ◽  
Air Bearing ◽  
Machined Surface ◽  
Spindle Shaft ◽  
Ultra Precision

Dynamic vibrations of air bearing motor spindles have significant influence on the surface quality in ultra-precision machining. In this article, the influence of the vibration caused by the unbalanced magnetic force on the diamond turning is investigated on the basis of the theoretical and experimental method. A permanent magnet motor model (10 poles and 12 slots) is built and then simulated to gain a periodic unbalanced magnetic force. The effects of unbalanced magnetic force on the inclination of the spindle shaft is analyzed, which would affect the surface quality of the workpiece, and the surface topography of the workpiece is predicted during an unbalanced magnetic force acting on air bearing motor spindle. The theoretical analysis and experimental turning results validate that the angle between the direction of unbalanced magnetic force and the feed direction has a certain relationship with the profile of the machined surface. Also, under different turning speeds and directions, the surface topography of the machined workpiece shows a 10-cycle-per-revolution pattern, which has good agreement with the simulations of periodic unbalanced magnetic force. This research work provides a theoretical foundation for the fault diagnosis of air bearing motor spindle caused by motor rotor eccentricity and its effect on surface generation in turning.

Development and Modeling of Water Driven Stage

2011 ◽  
Author(s):  
Yohichi Nakao ◽  
Toshiaki Sano ◽  
Midori Nagashima ◽  
Kenji Suzuki
Keyword(s):  
Machine Tools ◽  
Driving Force ◽  
Diamond Turning ◽  
Turning Operations ◽  
Hydrostatic Bearing ◽  
Supply Pressure ◽  
Piston Cylinder ◽  
Ultra Precision ◽  
Water Hydraulic ◽  
Precision Machine Tools

The water driven stage that is developed for ultra-precision machine tools is presented. The stage is designed for the diamond turning of small precise parts, such as various small lenses or mirrors. The moving table of the water driven stage is supported by water hydrostatic bearings. The stage is driven by the water hydraulic piston-cylinder mechanism that is designed inside the table. A feature of the stage is that the driving force by the piston-cylinder mechanism acts on the center of gravity of the moving table, minimizing undesirable pitching and yawing motions. In order to investigate the characteristics of the stage, a mathematical model of the water driven stage is derived. Performances of the water driven stage are examined through experiments and calculations. The present study verifies that the feed motion needed for the diamond turning operations can be obtained by supplying few flow rate of water, several tens milliliters per minutes. Stiffness of the water hydrostatic bearing is also experimentally investigated. The result shows that stiffness is approximately 330 N/μm if the supply pressure was 0.5 MPa.

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