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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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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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Effects of Spindle Speed on Turning Stability
Volume 4: Dynamics, Control and Uncertainty, Parts A and B, 2012Machining stability study for rough cuts suggests that low speeds impart instability. However, bifurcated states could be staged in between with increasing speeds. Therefore it cannot be concluded that speed increase would always result in stability. Using the cutting model presented in [1] and [2], critical DOCs are seen to increase with the increase ...
Achala V. Dassanayake, C. Steve Suh
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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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Zoom Synchrosqueezing Transform for Instantaneous Speed Estimation of High Speed Spindle
Materials Science Forum, 2016Instantaneous speed (IS) is of great significance of fault diagnosis and condition monitoring of the high speed spindle. In this paper, we propose a novel zoom synchrosqueezing transform (ZST) for IS estimation of the high speed spindle. Due to the limitation of the Heisenberg uncertainty principle, the conventional time-frequency analysis (TFA ...
Song Tao Xi, Hong Rui Cao, Xue Feng Chen
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Design of the High-Speed-Spindle Motor
2012As explained in Sects. 1.2 and 1.3 of the thesis Introduction, the PhD project started within the Dutch Microfactory framework with the goal of development of a built-in electrical spindle drive which would facilitate high rotational speed of the spindle and accurate micro-milling.
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Estimation of Axial Displacement in High-speed Spindle Due to Rotational Speed
Journal of the Korean Society of Precision Engineering, 2012This paper presents an estimation procedure for axial displacement in spindle equipped with angular contact ball bearings due to rotational speed. High-speed spindle-bearing system experiences axial displacement due to thermal expansion and rotational speed-dependent characteristics of angular contact ball bearings.
Gyu-Hyun Bae +3 more
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Fault Detection of a High-Speed Electric Spindle
Advanced Materials Research, 2012The high-speed electric spindle is the key part of the machining center which performing high speed precision machining. In order to ensure the electric spindle running under the smooth and steady state, it is necessary to prevent and discover the abnormities during the running process of the electric spindle by the experimental test and analysis.
Jin Xin Zhang +3 more
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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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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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