Effects of Cutting Parameters on Surface Roughness during End Milling of Aluminium under Minimum Quantity Lubrication (MQL)

In this study an experimental investigation of effects of cutting parameters on surface roughness during end milling of aluminium 6061 under minimum quantity lubrication (MQL) condition was carried out. The experiments were carried out to investigate surface quality of the machined parameters and to developed mathematical models using least square techniques. Spindle speed (N), feed rate (f), axial depth of cut (a) and radial depth of cut (r) has been chosen as input variables in order to predict surface roughness. The experiment was designed by using central composite design (CCD) in which 30 samples were run in a CNC milling machine. Each of the experimental result was measured using Mitutoyo surface tester. After the predicted surface roughness values have been obtained the average percentage errors were calculated. The mathematical model developed by using least square method shows accuracy of 89.5% which is reasonably reliable for surface roughness prediction. With the obtained optimum input parameters for surface roughness, production operations will be enhanced

Design, Production and Testing of a Single Stage Centrifugal Pump

The design, construction and testing of a single stage centrifugal pump is presented in this project work, electric motor drives the centrifugal pump, which draws fluid (water) from a water storage wall and delivers same through a flow control valve to a tank. The experimental results obtained shows that the tested pump can develop a head, (H) of 30m, volumetric discharge, (Q) of 9m3/hr and the speed of 2900 rpm for an input power of 1.5HP (1.1k). The operation of the pump was observed to be very smooth with low vibration and noise level on the pump and motor respectively, this guarantee the reliability of the pump in service

DEVELOPMENT OF A 0.5KW HORIZONTAL AXIS WIND TURBINE

Wind turbine is a machine that is powered by the energy from the wind. It is designed to convert the kinetic energy from the wind into electrical power (electricity). This study focus on the development of 0.5KW horizontal axis wind turbine. The major components of the wind turbine which include the blades, hub, shaft and the tower, were design and fabricated to meet the required 0.5 KW and the turbine was mounted on a tower height of 5m from the sea level. The test result showed that the wind turbine is capable of producing about 500 W, at a rotor speed of 153.5 rpm. The necessary design details that have been applied at the design and fabrication stages of the wind turbine guarantees the high hope of this wind turbine performing better

A Plan for Igniting Nigeria’s Industrial Revolution

The Industrialization of countries is in every way influenced by forerunner nations. This is exemplified in Western Europe’s copying of Britain’s technology and manufacturing systems. This work presents a study of the industrialization of nations such as Japan, South Korea, Taiwan, Singapore and several other industrializing countries and the lessons learned revealed that the industrialization of these nations was based on initial imitative-reverse-engineering of products of forerunner nations which then leads to endogenous growth and the onset of innovation under certain constraints. This is a strategic form of import substitution and is in fact the model around which a plan for Nigeria’s Industrialization has been buil

A Face Recognition Attendance System with GSM Notification

Current biometric methods for attendance are too intrusive. This paper presents a stress-free non-intrusive way of taking class attendance using face as the biometric. It also has the added novelty of relaying vital information about class attendance to handheld devices via any available cellular network. During enrollment, a camera was used to acquire facial images that were made into templates using Fisherfaces algorithm. These templates were stored in a database. During verification or attendance taking, facial features extracted from acquired face images and stored picture templates were compared using Fisher Linear Discrimination algorithm for any match within the pre-set threshold. Vital information about collated attendance reports were sent via a cellular network to designated handheld devices. The designed and implemented system had 54.17% accuracy during verification when lighting was varied without any variation in facial expression during enrollment. The system had 70.83% accuracy during verification when facial expressions were varied along with variations in lighting conditions during enrollment

Design, Construction and Evaluation of a Cylinder Lawn Mower

A manually operated mechanical machine for cutting grass was design, fabricated and tested. The machine was design with an internal gear system which transfers the torque to the mower mechanism. The machine's performance test evaluation was conducted in delta state sports stadiwn Asaba. Area of grass cut 2.1 m2 , desired height of cut 20m, time taken 2 min, area of grass cut to desired height 1.92 m2 which gave the cutting efficiency of the cylinder lawn mower 91% with 0.244 KN hwnan effort were obtained. The cutting effectiveness was achieved with a total power of 579.6 W at a rotary speed of 135 rpm of shaft. Its friendly to the environment because it does not emits carbon monoxide into the environment and the noise level is drastically reduced. The machine is considered highly efficient and is readily adaptable to different cutting conditions

DEVELOPMENT OF A 0.5KW HORIZONTAL AXIS WIND TURBINE

Wind turbine is a machine that is powered by the energy from the wind. It is designed to convert the kinetic energy from the wind into electrical power (electricity). This study focus on the development of 0.5KW horizontal axis wind turbine. The major components of the wind turbine which include the blades, hub, shaft and the tower, were design and fabricated to meet the required 0.5 KW and the turbine was mounted on a tower height of 5m from the sea level. The test result showed that the wind turbine is capable of producing about 500 W, at a rotor speed of 153.5 rpm. The necessary design details that have been applied at the design and fabrication stages of the wind turbine guarantees the high hope of this wind turbine performing better

Implementation of Box–Behnken design to study the factors interaction impacts and modelling of the surface roughness of AL 6063 alloys during turning operations

This study focuses on the experimental investigation of the relationships between cutting parameters and their effects on surface roughness during the turning process of aluminum alloy 6063 when dry machining is used. In order to construct a model utilizing Box–Behnken Design and analyze the surface quality of the three machining variables, experiments were conducted. The factors employed in this study are input factors Spindle speed depth of cut and feed rate, in order to predict surface roughness. The experiment was designed by using Box–Behnken Design in which 17 samples were machined in a lathes machine. Each of the experimental results was measured using an SRT-6210S surface roughness tester. After achieving the data the Box–Behnken Design was used to predict the surface roughness. The ANOVA shows the significant factors and their interaction effects on the surface roughness and the model developed shows an accuracy of 95% which is realistically reliable for surface roughness prediction. With the obtained optimum input factors of 165 rev/min, depth of cut 1 mm, and feed rate 0. 5 mm/rev achieved predicted surface roughness of 9 μm. Therefore, the optimum input factors will greatly reduce the surface roughness and it will have improved manufacturing operations

Effects Of Organizational Structure On Sports Personnel Satisfaction In Nigeria: Southwest Tertiary Institution

The study was carried out on organizational structure and sports personnel satisfaction in Nigeria South West Tertiary Institutions. To this end, a total of 200 sports personnel’s that cut across four institutions, that is, LASU, UNILAG, UI, and Ibadan Poly, were selected through a stratified random sampling technique and served as respondents in the study. A self-developed and validated questionnaire was the instrument used for data collection. Fifty (50) copies of the questionnaire were administered in each of the institutions using on the spot administration for high percentage returns. The data collected was used to develop a frequency distribution table for analysis. The descriptive statistics of percentage, bar, and pie charts were used for data presentation, while the t-test statistical tool was used in testing all stated hypotheses using 0.05 confidence levels. The findings show that Organizational structure, Reward, and Communication have significant influences on sports personnel satisfaction in Nigeria South-west Tertiary institution, it can also be depicted that for the development of any institution or sport academic, the organizational structural effects of the sports personnel need to be structured appropriately to promote healthy living

Comparative Analysis of Chatter Vibration Frequency in CNC Turning of AISI 4340 Alloy Steel with Different Boundary Conditions

In this study, an experimental investigation of chatter vibration frequency in CNC turning of AISI 4340 Alloy Steel material was carried out, with uncoated carbide tool insert (TPG 322) on Fanuc 0i TC CNC lathe machine, with two boundary conditions. The experimental design adopted for this study is the Taguchi parameter design with L9 orthogonal array. Turning tests were carried out on nine samples of the test-piece material for the clamped-free (C-F) condition, and the tests replicated on another set of nine test-pieces for Clamped-Pinned, so-called C-SS workpiece boundary condition.  Chatter vibration frequencies were measured using MXC-1600 digital frequency counter and the frequency plots continuously analysed through DTO 32105 sound signal and frequency analyzer. The main objective is to investigate the process parameters’ performances on the work-piece material of AISI 4340 alloy steel, and to carry out comparisons between the two different boundary conditions vis-à-vis the effects of process parameters which are cutting speed, feed rate and depth of cut on the chatter vibration frequency for the orthogonal turning operation. Chatter vibration frequency values for the C-SS scenario were found to be up to 30% lesser when compared to the C-F machining scenario. Introduction of the tailstock used in pinning the free-end of the slender work-pieces reduced the chances that workpiece would bend; whereas absence of the pinned end means that workpiece may be skewed at an angle in the chuck with increased dynamic deflections at the free end leading to more aggressive workpiece and cutting tool perturbations which are known to favour cutting instability