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High-Efficiency Cutting with Spindle Speed Variation
High-Efficiency Cutting with Spindle Speed Variationopenaire
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Test procedure for very high speed spindle motors
Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting, 1995Abstract In the last ten years, the new power electronic devices and the new control techniques have allowed to open new application fields for adjustable speed/torque electrical drives. Although the traditional dc drives keep still the market supremacy, the new ac drives have performance really attractive and some additional benefits due to the ...
BOGLIETTI, Aldo +3 more
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Spindle Speed Effects on Cotton Quality
2006 Portland, Oregon, July 9-12, 2006, 2006Three cotton varieties were grown under furrow-irrigated conditions in southern New Mexico and harvested at three different spindle speeds (1500, 2000, and 2400 rpm). Results for stalk losses, trash content, and fiber quality are presented.
null Kevin D. Baker, null S. E. Hughs
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A speed-dependent variable preload system for high speed spindles
Precision Engineering, 2015Abstract High speed machine tools are required to operate in a wide range of spindle rotational speeds with high stiffness and high accuracy. The stiffness of the spindle is largely dependent on the axial preload of the angular contact bearings. A large preload is required at lower range of speeds to provide sufficient stiffness for vibration-free ...
Masoud Razban, Mohammad R. Movahhedy
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Cage Friction in High-Speed Spindle Bearings
Tribology Transactions, 2013Friction-induced heat is one of the main reasons for the upper speed limit of high-speed angular contact ball bearings (spindle bearings). One source of friction inside the bearing is the cage. In this article, it is shown through experimental results that the frictional losses due to the cage are of significant magnitude. Based on measurements, a new,
Christian Brecher +2 more
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High-Speed Motorized Spindle Decoupling Optimization Control
Advanced Materials Research, 2014High-speed motorized spindle is the core component of the CNC machines. Its dynamic performance directly affects the accuracy of the geometry, and be the root cause of vibration, noise and temperature increase, etc. Its motor control system has the characteristics of nonlinear and strong coupling, which is one of the key R&D items of the spindle ...
Chi Lan Cai +3 more
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Spindle Speed Optimization for Cotton Pickers
Applied Engineering in Agriculture, 2015Abstract. There is concern that changes to the operating speed and size of spindles on cotton picker harvesters over the years have resulted in a general decrease in cotton fiber quality, especially spindle twists, preparation, and neps. Previous research showed that spindle speeds of 3000 and 4000 rpm had more detrimental effects on picker stalk loss,
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High Speed Bearings for Machine Tool Spindles
CIRP Annals, 1980A major car manufacturer reports that the greatest part of machines down time is due to spindle bearings failure, despite the fact that their loads are generally very low. It is Shown in this paper that the main reason for these early failures is thermal instability of the bearings/spindle/spindle housing assembly, that leads to uncontrolled hertzian ...
F.C. Pruvot, A. Mottu
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Thermal model of high-speed spindle units
KSME International Journal, 2003For the purpose to facilitate development of high-speed spindle units (SUs) running on rolling bearings, we have developed a beam element model, algorithms, and software for computer analysis of thermal characteristics of SUs. The thermal model incorporates a model of heat generation in rolling bearings, a model of heat transfer from bearings, and ...
Igor Alexeevich Zverev +3 more
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Intelligent speed-increasing spindle using traction drive
Precision Engineering, 2011An intelligent speed-increasing spindle using a wedge-roller-traction drive (WTD) is developed to realize high-accuracy milling. The WTD is a type of planetary roller variator, whose ring and sun rollers are nonconcentric. The generation of little heat is a feature of the WTD.
Masashi Yamanaka +3 more
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