The purpose of this research is to determine the empirical model for surface roughness in a turning process. This process is performed in the final assembly department at a manufacturing company which supplies fluid dynamic bearing (FDB) spindle motors for hard disk drives (HDDs). The workpieces used were the sleeves of FDB motors made of ferritic stainless steel, grade AISI 12L14. A 2 factoria...

Cooperativity is well known to promote the speed of some biochemical reactions by accelerating the activity of enzymes. Recent studies have shown that cooperative interactions also function during the formation of a complex cellular structure, the mitotic spindle. Capture of kinetochores by dynamic astral microtubules was originally proposed as the basis of spindle formation. However, mounting ...

Manufacturing process primarily spotlights its objective as increasing productivity embedded with improved performance. In the scenario of contest between the sectors of industries, it is most important criteria to have an optimized performance in Machining parameters to have a better role of independence in owing to improve from better production to best production. In this task of Turning it ...

Abstract Spindle dynamic conditions such as stiffness, damping, runout, and resonance frequencies are the most important factors to determine quality of machined part. Thus, spindle characterization in-situ identify behavior is crucial achieve high dimensional accuracy during machining. This paper presents a new class sensors, so-called curved-edge sensors (CES), capable condition monitoring wh...

Abstract The paper deals with strategies for numerical compensation of thermo-mechanical deformation machine tool spindles and the TCP, respectively. Methods digital modelling simulating temperatures thermo-elastic are presented. This is done by considering geometry, material data, drive signals temperature values. topic compensating effects in spindle units an important manufacturing. Analytic...

This paper investigates the static and dynamic characteristics of precision hydrostatic spindle with a mid-thrust bearing under different working conditions. Firstly, establishes fluid governing equations coupled journal thrust bearings based on orifice restrictors; Reynolds are solved using perturbation finite difference methods to obtain steady transient pressure distribution functions. Then ...

Experimental results demonstrate that μ synthesis provides an excellent tool for increasing the dynamic stiffness of thrust magnetic thrust bearings. Accurate system modeling and appropriate uncertainty descriptions are critical to obtaining such results and are described in detail. Both complex μ and mixed μ synthesis were used to design controllers. The performance of the μ controllers is com...

Due to high surface speed and active control capabilities, active magnetic bearings hold great promise for high speed machining spindles. Herein, the control problem posed by this application is examined and the development of an advanced prototype is reviewed. A μ synthesis framework is proposed for this problem and it is shown that the minimization of the susceptibility to machining chatter m...

Chatter is a complicated problem faced by machine tool operators. Chatter is a self-excited vibration that can occur during machining operations. This is an undesirable phenomenon which limits the productivity of the machine. A lot of techniques have been developed to control the chatter. Stability lobe diagram is an effective tool which helps the operator to select specific spindle speeds duri...