Abstract
A process capability study is performed for the turning process on a general purpose center lathe in order to verify the process performance and machine ability to perform within specified tolerance limit. The process and machine capability indices were measured to determine the process and machine adequacy for industrial application. The tolerance limits were obtained from the given nominal size of the shaft, using the basic hole system and 90 sample shafts were turned on the lathe machine to specification for varying spindle speed and feed rate of the lathe. Three (3) samples were randomly selected for the turning process of a combination of the spindle speed and feed rate as a subgroup size for a total subgroup of thirty (30). The diameters (representing the quality characteristics) were used to generate control charts and capability histogram for the process. The process is within statistical control but found incapable of meeting up to specification because the capability index (Cp) measured was less than 1 and the machine capability for industrial application is not adequate.
Highlights
Machining is a general purpose manufacturing process for the manufacture of machine components and the performance evaluation of metal cutting machine tools is often based on their capability in machining work piece to specified details
The analysis ensures that processes are fit for industrial specification and limiting the process variation is important in achieving product quality characteristics [2]
The focus of this study is to investigate the process capability of turning on the general purpose AJL180325VS Gap Bed Lathes machine installed for student training for purpose of industrial application
Summary
Machining is a general purpose manufacturing process for the manufacture of machine components and the performance evaluation of metal cutting machine tools is often based on their capability in machining work piece to specified details. A process capability index is a numerical summary that compares the behavior of a product or process characteristic to engineering specifications [7] [8] These measures are often called capability or performance indices or ratios; we use capability index as the generic term. [11] attempt to study the effect of machining parameters on the surface characteristics and quality of machined part with respect to the specific cutting pressure, microstructural alteration and microhardness of high speed dry turning of superalloy Inconel 718. In the investigation by [15], the surface roughness of a machined piece tends to decrease with increasing cutting speed during turning operation up to a specified limit while the roughness decreases with decreasing feed rate of the machine tool. The machine was investigated to determine its suitability for machining operation at specified tolerance limit as may be required by the industrial clients
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